Before choosing a part
Compatibility essentials
Start with these documented details. Read the requirements with each answer before choosing a needle, bobbin or foot.
- Foot attachment
- Needle system / designation
- Needle sizes by fabric and use
- Differential feed / fabric settings
- Overlock, coverstitch & combination widths
Overlock cutting width: left needle 5.0–7.0 mm; right needle 3.0–5.0 mm. Coverstitch: 2.8–5.6 mm. Combination stitches: 7.8–12.6 mm. The cutting dial uses the left overlock needle as its reference; the right needle is 2 mm closer to the cut edge. These are separate stitch setups, not a zigzag maximum.
Requirements and sources →
Not yet confirmed here: Manufacturer accessory group, Presser-foot shank type, Foot holder / mount, Foot interface / generation, Bobbin type / class, Bobbin material, Bobbin diameter, Bobbin height, Hook type, Maximum stitch / zigzag width, Feed system, Bobbin loading direction. What is still to confirm →
Presser feet and accessory sets
The accessory catalogue lists these numbers for b68 AIRLOCK’s overlocker B3 category. The two feet and two sets are different items.
Check catalogue limits and page references
These listings do not establish standard shank or mounting dimensions, replacement equivalence, what comes with your machine, or whether a seller’s item fits. Follow each accessory’s instructions and check local availability.
Model category — catalogue page 44 →Standard feet — catalogue page 45 →Accessory sets — catalogue page 51 →Model & names
- Model
- bernette b68 AIRLOCK
Other names, regional versions and related models have not been confirmed here. A shared manual, product line or accessory group does not identify the machine's family.
What do you need help with?
Which needle types, sizes and positions does this manual specify?
Before you use this answer
Use the June 2023 b68 AIRLOCK manual’s exact ELx705, CF/SUK CF, fabric and position guidance. Sizes are not automatically available in every branded range. This does not establish other needle-system equivalence or b68 Maker compatibility.
Documents and page references →How does the foot attach, and how does the knee lifter affect it?
Before you use this answer
Follow the complete safety and attachment instructions. Keep tension release, the latched-up foot and slow knee-lifter release conditions together; an attachment procedure does not establish a generic shank or holder standard.
Documents and page references →What widths are listed for overlock, coverstitch and combination stitches?
Before you use this answer
These June 2023 table ranges belong to different stitch setups and needle positions. Keep the left/right cutting-dial reference with its range; do not turn the largest number into a universal maximum stitch width.
Documents and page references →How should I adjust presser-foot pressure, and what differential-feed range is listed?
Before you use this answer
Use the manual’s medium-weight starting point, light/heavy fabric adjustments and a test seam. Presser-foot pressure and the differential-feed ratio are different controls.
Documents and page references →Can waxed threads or thread-change knots damage the threading system?
Before you use this answer
The June 2023 warnings cover coated/waxed thread, pipe blockage, the threading wire and knots at the needle eye. They are not a complete current air-threading guide; some 2026 threading and oiling instructions differ and remain outside these answers. Refer air-system faults to an authorized dealer.
Documents and page references →Which power ratings and controller information should I check?
Before you use this answer
Check the actual machine’s nameplate. The alternative regional ratings do not mean universal 100–240 V operation or establish which replacement controller, plug or transformer fits.
Documents and page references →More questions (2)
Which standard-foot and clear-sole foot numbers does the accessory catalogue list?
Before you use this answer
The catalogue lists two different feet. Check the exact article number and follow that foot’s fitting instructions; this is not a replacement-equivalence or shank-size guide. Availability and supplied equipment vary by country.
Documents and page references →What is included in the cover/combo and overlock/combo foot sets?
Before you use this answer
These are two separate optional sets with different contents and article numbers. The catalogue listing does not mean either set comes with the machine. Check local availability and follow each accessory’s instructions; individual mounting details have not been confirmed here.
Documents and page references →Manuals, parts books & more
Manuals & manufacturer documents
Available documents & sources
- Accessory compatibility guide
- bernette Accessory Catalog · Printed code 5020001.6.04; publication date not confirmed
- Operating manual
- b68 AIRLOCK instruction manual
Publisher links below distinguish a matched file from a listing.
Choose the document for your task: an instruction manual, service manual, parts list and accessory guide answer different questions.
About this document & page references →
Instructionb68 AIRLOCK instruction manual
bernette108 pages
Edition and models
Edition not confirmed.
Models referenced here: bernette b68 AIRLOCK
The operating answers below use the English June 2023 manual, code 50400685.00A.04. This identifies their cited edition; the general document listing has not had its edition and language details completed. These answers have not been updated to the separate 2026 manual. A current publisher listing may provide a different edition.
About this document & page references →
Accessory compatibilitybernette Accessory Catalog
bernette56 pages
Edition and models
Edition: Printed code 5020001.6.04; publication date not confirmed
Models referenced here: bernette b68 AIRLOCK
Accessory catalogue, printed code 5020001.6.04. May 2025 and EN appear in its URL; a printed publication date has not been confirmed. This is separate from the operating manual. SewIndex does not reproduce this catalogue or its illustrations.
Needle, bobbin & presser-foot details
Read the model-specific requirements with each answer before choosing parts.
Needle
System
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
ELx705
Sources and pages
Supported size range
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
80–100 (12–16)
Sources and pages
Positions
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Use the selected stitch’s exact needle configuration; five holder positions are not permission to use all five for every stitch.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
LN and RN are the left and right overlock positions. LC and CC serve coverstitches and chainstitches; RC serves coverstitches. Correctly inserted needles sit at different heights.
Sources and pages
Insertion
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Switch off for needle-area work, raise the needles and foot, and use the supplied inserter and screwdriver. The manual separately specifies ELx705 needles and sizes 80–100 (12–16); read the needle-type and fabric guidance before choosing.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Insert flat side back, push fully into the selected holder opening and check through the needle-checking window before tightening. Keep holder screws tightened even in unused positions, but never overtighten them.
Sources and pages
Subtypes
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Follow these needle-subtype and fabric restrictions alongside the stated system and size range. They do not establish HAx1 or universal-needle equivalence or one size recommendation for all fabrics.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The manual recommends chrome-finish ELx705 CF. Its overview lists CF for overlock and coverstitch, and ELx705 SUK CF for multilayer elastic fabrics; each row names 80/12, 90/14 and 100/16. It notes that not all sizes are available as Bernina needles.
Sources and pages
Attachment
- Applies to the manual's ordinary presser-foot attachment procedure.
Place the foot pin below the shaft groove and lower the shaft until the groove engages the pin.
Sources and pages
Mount or fit
Not yet verified- Not yet verified: The procedure does not establish a standardized shank class, universal fit or third-party fit.
Catalogue standard foot reference
- For b68 AIRLOCK in this catalogue’s overlocker B3 category. The sewing and embroidery category B is a different system.
- These are applications listed in this catalogue edition. They do not confirm current stock, the accessories supplied with your machine, a seller’s item authenticity, a standard shank or mount, replacement equivalence, or other model names.
- Availability, equipment and product features vary by country and may change. Follow each accessory’s fitting and operating instructions; its individual mounting steps have not been verified here.
- These accessory listings do not establish bobbin or needle compatibility.
Standard Presser Foot: 502 040 55 77 (B2,3). Standard Presser Foot with Clear Sole: 502 040 60 26 (B1,3). The b68 AIRLOCK is listed under overlocker B3. These are two different feet; the catalogue does not confirm that one replaces the other.
Sources and pages
Catalogue cover combo set
- For b68 AIRLOCK in this catalogue’s overlocker B3 category. The sewing and embroidery category B is a different system.
- These are applications listed in this catalogue edition. They do not confirm current stock, the accessories supplied with your machine, a seller’s item authenticity, a standard shank or mount, replacement equivalence, or other model names.
- Availability, equipment and product features vary by country and may change. Follow each accessory’s fitting and operating instructions; its individual mounting steps have not been verified here.
- These accessory listings do not establish bobbin or needle compatibility.
Cover/Combo foot set 502 040 60 96 (B1,3) contains seven accessories: Binder Attachment for Unfolded Bias Tape, Standard Presser Foot with Clear Sole, Hemmer and Lace Foot, Hemmer Foot, Cording Foot, Lace Foot and Belt-Loop Foot. This number identifies the whole set, not an individual foot or the accessories supplied with the machine.
Sources and pages
Catalogue overlock combo set
- For b68 AIRLOCK in this catalogue’s overlocker B3 category. The sewing and embroidery category B is a different system.
- These are applications listed in this catalogue edition. They do not confirm current stock, the accessories supplied with your machine, a seller’s item authenticity, a standard shank or mount, replacement equivalence, or other model names.
- Availability, equipment and product features vary by country and may change. Follow each accessory’s fitting and operating instructions; its individual mounting steps have not been verified here.
- These accessory listings do not establish bobbin or needle compatibility.
Overlock/Combo foot set 502 040 60 23 (B2,3) contains six feet: Ribbon-Couching, Elasticator, Blindstitch, Piping, Beading and Sequins, and Gathering. Keep this set number separate from the Cover/Combo set and individual foot numbers.
Sources and pages
Specifications & documented facts
Specifications apply to the named model and document edition. Read any setup, fabric or safety requirements with the answer.
Airthread
Operation
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Air threader is for the loopers, not the needle eyes. Follow full powered-air versus switched-off needle-area safety in the original manual; do not infer a procedure for internal repair.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Open the prepared threader cover, move the connector left and slowly hand-turn counterclockwise until pipes couple. Leave about 56 cm thread reserve; insert about 1.2 cm in the correct nozzle and hold the air button until thread exits the looper eye. Release, route it behind the foot, return the connector right and close the cover.
Sources and pages
Thread limits
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- The manual gives a separate auxiliary-thread method if air threading cannot be used. Do not push a wire through the pipes to clean them, use solvents or compressed air, or bypass safety or access restrictions. Refer air-system malfunctions to an authorized dealer.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Coated or waxed threads may deposit material and permanently block its pipes. The threading wire is a wear part for fallback threading, not permanent threading or cleaning; insert and pull it only in thread-flow direction. Air-system malfunctions go to an authorized dealer.
Sources and pages
Performance & stitch capabilities
Number of stitches
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
31
Sources and pages
Number of loopers
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
3
Sources and pages
Number of needles
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
1–5
Sources and pages
Differential feed range
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
0.6–2.0
Sources and pages
Maximum sewing speed
- For b68 AIRLOCK and the cited manual only. Do not apply another model’s instructions or a neighboring table column. Additional operating requirements are not confirmed by this passage.
1300 stitches per minute
Sources and pages
Care
Looper clean
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- General safety additionally requires unplugging for cleaning/maintenance. Partial task summary; consult full diagrams and do not improvise internal service.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
With foot raised, needles highest and machine off, remove the foot and unscrew the stitch plate. Brush or vacuum lint and thread remnants. Refit the plate, slowly hand-turn to check knife, needle and feed-dog clearance, then replace the foot.
Sources and pages
Controller
Handwheel
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Keep clear of needle, loopers and knife. This is not a Start/Stop-button or powered needle-position claim.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Pedal pressure varies speed; increasing pressure starts sewing and reducing it stops. Turn the handwheel counterclockwise for precise needle placement, looper or knife movement and mechanical air-threader coupling.
Sources and pages
Controls
Covers
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Do not force the cover or bypass a guard. The troubleshooting table’s close-looper-cover advice is not proof of every interlock state.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The manual says the air-threader connector is still switched on if the cover will not close completely. Return it to the sewing position as the full threading procedure directs. All covers must be fitted or closed before sewing.
Sources and pages
Dimensions
Setup weight
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Preserve stated configurations; packaged mass is not machine mass, and no open-guide height or shipping-carton dimension is established.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Without the retractable thread guide, L×W×H is 43×27×29 cm. With slide-on table and cut-offs bin it is 59×40×29 cm. Machine weight is 8.9 kg; packaged weight is 12.8 kg.
Sources and pages
Electrical
Ratings
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- These are alternative regional ratings, not a universal 100–240 V input. Frequency, current and controller-to-region matching are not specified in this table. Check the machine’s nameplate; no transformer, plug or replacement pedal is approved by this information.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The specification table lists 120V with 80W, or 230–240V with 75W, and protection class II. The safety page requires the supplied foot-control type 4C-326G/4C-316B.
Sources and pages
Foot
Knee tension
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- This describes temporarily lifting the foot, not knee-operated speed control or a powered foot lift. The separate foot pin and shaft-groove attachment instructions still apply.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Raising the foot releases thread tension; lowering it activates tension. With the knee lifter attached, move it right and hold to lift the foot, then release slowly to lower. For an already latched-up foot, move fully right before slowly releasing.
Sources and pages
Length
Range
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Use the stitch chart’s task setting and test the actual material; length range is separate from cut width, coverstitch spacing and differential ratio.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The manual gives a continuous 1.0–5.0 mm stitch-length adjustment, including while sewing. Higher dial values lengthen the stitch and lower values shorten it.
Sources and pages
Looper
Upper switch
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Switch off for needle/looper-area adjustments. The complete selected-stitch conversion also includes knife, needles and threading; this is not a standalone complete conversion guide.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
To activate it, open the threader cover, set Upper Looper On/Off right, turn the handwheel until it engages and fit the knife-cover insert. To deactivate, first unhook its converter and put the upper looper lowest, set the switch left and fit the coverstitch insert.
Sources and pages
Converter
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Converter hook-in is separate from deactivating the upper looper. No substitute part or arbitrary stitch applicability inferred.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The needles must be highest, the upper-looper thread removed, and the lower-looper thread below the upper looper. The converter hooks onto the looper with its tip in the looper eye as illustrated.
Sources and pages
Mtc
Control
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Preserve all prerequisites; mtc does not replace correct threading/tension or set the cut width. Keep fingers clear while adjusting.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
It controls how much looper thread lies around the fabric edge. After correct tension and knife position, start at minus and make a test seam. Moving toward plus enlarges edge loops; toward minus reduces them. The manual allows adjustment while sewing.
Sources and pages
Pressure
Adjustment
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- The scale does not specify pressure force, foot-lift height or a safe fabric-thickness limit. The separate differential-feed range still applies.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Factory pressure suits medium-weight fabrics. Reduce it for light fabric and increase it for heavy fabric, then test a seam. Higher pressure-wheel values increase pressure; lower values reduce it.
Sources and pages
Rolled hem
NR
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Select the complete rolled-hem stitch settings; do not transfer another model’s separate stitch-finger removal procedure.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
N supports ordinary overlocking around the stitch finger. R retracts that finger, reduces the looper-thread loops and rolls the fabric edge underneath for rolled hems.
Sources and pages
Thread
Change knots
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Needle-thread and looper-thread procedures stay separate. Switch off for needle-area work; follow the original knot diagram.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
No. The manual warns that a tie can bend the needle. Cut the join before the eye and thread the needle separately; it gives a distinct pull-through route for changing looper thread.
Sources and pages
Threading
Preparation
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Switch off for needle/looper-area work under safety instructions. Threading sequence and individual paths still require the full stitch chart and diagrams.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
Match machine settings to the selected stitch, fully extend the thread guide, raise the needles and remove unused threads and needles. Raise the foot to release tension before seating thread in the marked paths and tension discs.
Sources and pages
Width
Stitch domains
- For b68 AIRLOCK in English manual 50400685.00A.04, June 2023. b68 Maker and other models may differ.
- Overlock cutting width, coverstitch width and combination-stitch width are separate measurements. The 12.6 mm figure is not a zigzag maximum or a standard for interchangeable feet. Keep each width with its own table column and units.
- Based on manufacturer documentation checked using AI, without personal human review or hands-on testing. Follow the complete manufacturer safety instructions and illustrations. This does not confirm that replacement products fit.
- These instructions apply only to the June 2023 edition. The separately documented 2026 instructions differ in some threading and oiling details and are not covered here. Do not treat this as an updated 2026 procedure or a complete current threading or oiling guide.
The table distinguishes overlock cutting width LN 5.0–7.0 mm and RN 3.0–5.0 mm, coverstitch width 2.8–5.6 mm and combination-stitch width 7.8–12.6 mm. The cutting dial references the left overlock needle; the right overlock needle is 2 mm nearer the cut edge.
Sources and pages
Part numbers & accessories
These are manufacturer part references. A drawing or matching number alone does not confirm that a replacement from a seller fits. Check the model-specific listing and restrictions.
The four manufacturer foot and accessory-set numbers are listed in Presser feet and accessory sets above. These catalogue references do not confirm mounting dimensions, replacement equivalence, what comes with the machine, or whether a seller’s item fits.
Check the exact model and part before ordering. Missing information does not mean a part is incompatible.
Care, setup & service references
Use the full source procedure and its safety precautions. A short referenced answer is not a substitute for service documentation or qualified electrical/mechanical repair.
Service-manual availability and service-only procedures remain unestablished unless separately cataloged and reviewed.
Coverage and source-review limits
Model-specific documents support selected answers. Their requirements and unanswered questions remain; substitutions and third-party compatibility have not been confirmed.
Coverage and remaining questions
- Operating manual
- Listed below; check the edition and available link.
- Manufacturer part references
- The accessory catalogue lists two standard-foot numbers and two accessory-set numbers for b68 AIRLOCK’s B3 category. See Presser feet and accessory sets above. Mounting dimensions, replacement equivalence, supplied accessories and a seller’s specific item have not been verified.
Still to confirm
An unanswered question does not mean a part is incompatible. We have not confirmed enough information to recommend it.
Presser foot — Mount or fit: Not established Full recorded limit & conditions →
Other names, regional versions, production history, further specifications and documents are not fully covered here. Their absence is not a “none exist” finding.
Sources and page references
Each answer links to its exact evidence passage below. Open a reference to see the document and page. These links identify the source; they do not include the full manual or its diagrams. Document access is consolidated in the OEM library above.
Document and page references (38)
bernette Accessory Catalog
Published by bernette · Printed code 5020001.6.04; publication date not confirmed
Checked against the document text.
Document and available links →About this document →PDF page 6 · printed page 6
About this document link
Applicability and edition
Catalogue guidance: use the overlocker section and its own model list. Pictures do not show which accessories are supplied with a machine.
PDF page 44 · printed page 44
About this document link
Applicability and edition
The overlocker model list places b68 AIRLOCK in B3. The sewing and embroidery category B is separate; this does not cover b68 Maker or other models.
PDF page 45 · printed page 45
About this document link
Applicability and edition
The catalogue lists the standard and clear-sole feet separately, with categories B2,3 and B1,3. These are not confirmed substitutes.
PDF page 56 · printed page 56
About this document link
Applicability and edition
Availability and product features can vary by country and change over time. May 2025 and EN appear in the document URL; a printed publication date has not been confirmed.
PDF page 51 · printed page 51
About this document link
Applicability and edition
The two rows identify different complete sets and their listed contents, not individual foot numbers or accessories supplied with the machine.
Editorial responsibility & corrections
Alex Shick · Founder and editor. Corrections managed by Alex Shick.
This bernette b68 AIRLOCK guide is based on documents, with AI assistance to organize the information. We have not tested or repaired the machine.
Check the document edition with each answer. A source review date is not a machine inspection date or a promise that the manual is the latest edition.
Contact the SewIndex team or report a correction ↗
The correction address has been tested and its monitoring confirmed. We cannot promise a response or accept every suggested change.
Report an error with the model, document and page · About SewIndex and our method
About this information
Answers come from the documents named on this page. They describe those editions, and may not cover later changes to the machine or manual.