A bobbin, a bobbin case, and an elective task-specific holder are different parts of a sewing setup. A familiar size label or similar appearance does not prove that a replacement fits. Start with the exact machine and the component you need.
Check the machine before the part#
Record the complete model name and suffix, revision or generation if shown, and the market where the machine was sold. Then check the machine manual and the current local manufacturer listing for the part number and the component it describes.
Keep three source statements separate:
- Listed for a model describes a compatibility relation within that listing’s scope.
- Included with a machine describes a package or supplied-part relation.
- Replacement part identifies what the manufacturer currently directs the reader to obtain for that machine.
One statement does not establish the others. If the exact model, revision, market, or replacement route is missing, ask the manufacturer or an authorized dealer before ordering. A damaged case may need a service route; a cleaning or reseating instruction is not automatically a case-replacement procedure.
What selected manufacturer sources establish#
| Machine or part | What the cited source establishes | What remains open |
|---|---|---|
| Brother CS7000X bobbin | Brother USA and Canada identify SA156, a plastic Class 15 type, in their CS7000X support coverage. The USA answer says not to use metal bobbins. | These pages do not establish that every Class 15 bobbin is equivalent to SA156 or identify a replacement case. |
| Brother CS7000X case | A 2020 Brother included-accessory notice lists case XF5707-101 as “on machine.” A separate Brother support answer says not to use a scratched case and directs users to an authorized service center for a new one. | An included code is not a current replacement approval. The support answer supplies no replacement number or user-replacement procedure. Its case marks are a reseating reference within that answer’s scope. |
| Janome 2212 case | Janome lists bobbin case unit 647515006 for the 2212. | That listing does not establish fit for another model, revision, or market. |
| Janome high-speed case | Janome part 767510006 has product prose naming 1600P, 1600P-DB, 1600P-DBX, and 1600P-QC. The same page’s selector displays only 1600P-QC. | Janome does not reconcile the two fields. Keep them separate; a selector omission is not proof of incompatibility. |
| Janome HD9 Version 2 bobbin | Janome lists Version 2 part 767860107 and says Version 1 and Version 2 bobbins are not compatible. Its selector shows HD9BE, HD9 Professional, and HD9QC Professional. | The page does not identify the earlier Version 1 part or every regional/revision name. Confirm the machine generation before buying. |
| SINGER Heavy Duty 4423 bobbin | SINGER’s US machine page specifies a transparent Class 15 bobbin. Its separate D2134 page identifies a four-pack of transparent Class 15 bobbins. | The pack page does not map D2134 to an exact 4423 revision. A shared class label does not prove that mapping. |
| Janome clear bobbin pack | Janome identifies ten-pack 200122647 and names 1600P, HD9, MB4, and MB7 as exceptions. | The page does not name alternative parts for those models. An exception is not a substitute recommendation. |
When the listing is incomplete#
Do not choose by appearance, broad machine family, or a bobbin-style label alone. Confirm the current part for the exact machine and market. If a product page disagrees with its own selector, preserve that conflict and ask the manufacturer which relation applies. Do not adjust a tension screw or repair a case from a part listing.
A preset free-motion holder is an elective task-specific accessory, separate from standard bobbin or case replacement. See Janome’s free-motion holder parts and model lists. For general foot and attachment checks, use the compatibility checklist. Bobbin symptoms and machine care belong with the exact machine manual and service guidance.