Sewing-machine answers from manuals and manufacturer documents. About the evidence
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Bobbin family

J-marked plastic bobbins

Machines whose cited manual specifies “J” plastic bobbins for a horizontal hook. The manuals warn against other bobbin types, including pre-wound paper bobbins.

6 machine records across 2 brands

J-marked plastic bobbins: cited answers by machine
MachineWhat the cited source saysExact record
bernette 38
Conditions & scope (2)
  • Exact bernette b38 and cited document/edition; no sibling, variant or retail-unit transfer.
  • This establishes literal J marking, plastic and horizontal-hook wording. It does not establish Class 15, dimensions, polymer chemistry or cross-brand substitution.

The manual specifies “J” plastic bobbins for a horizontal hook, marked J. It warns that other bobbins, including pre-wound paper bobbins, may cause stitching problems or damage the holder.

Answer, sources & pages →
Janome SKYLINE S3
Conditions & scope (1)
  • Exact manual recommendation only; no item fit or class 15/15J inference.

Use J-marked plastic bobbins for the horizontal hook; other bobbins, including pre-wound paper bobbins, may cause stitching problems or holder damage.

Answer, sources & pages →
Janome SKYLINE S5
Conditions & scope (1)
  • Exact manual recommendation only; no item fit or class 15/15J inference.

Use J-marked plastic bobbins for the horizontal hook; other bobbins, including pre-wound paper bobbins, may cause stitching problems or holder damage.

Answer, sources & pages →
Janome SKYLINE S6
Conditions & scope (1)
  • Exact manual recommendation only; no item fit or class 15/15J inference.

Use J-marked plastic bobbins for the horizontal hook; other bobbins, including pre-wound paper bobbins, may cause stitching problems or holder damage.

Answer, sources & pages →
Janome SKYLINE S9
Conditions & scope (1)
  • Exact manual recommendation only; no item fit or class 15/15J inference.

Use J-marked plastic bobbins for the horizontal hook; other bobbins, including pre-wound paper bobbins, may cause stitching problems or holder damage.

Answer, sources & pages →
Janome Continental M6
Conditions & scope (1)
  • The manual's parenthesized (4) is an illustration callout, not quantity. No dimensions or third-party substitution are established.

Use J plastic bobbins for the horizontal hook; do not use easy or metal bobbins.

Answer, sources & pages →

A shared name or part number in two manuals does not prove that one machine’s bobbin or foot fits another. Read each machine’s conditions, then check its exact record before you buy or swap parts.

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