Find the model number on your sewing machine
Keep the machine model, serial number and accessory reference separate. Each answers a different question.
Guides
13 guides
Find the model
Parts & compatibility
Class 15, 15J and 66: identify the correct bobbin
Flat and curved profiles, plastic and metal, and brand references matter more than a rough diameter match.
Singer Heavy Duty 4423: bobbins and accessory checks
The 4423 uses transparent Class 15 bobbins. Class 15J and metal Class 15 are different choices.
Brother SA156 bobbins: CS7000X and the supported model list
SA156 is Brother’s clear plastic 7/16 inch bobbin. Use its exact machine list rather than a generic Class 15 claim.
Janome 102261103 bobbins: the standard family and exceptions
Janome lists HD-3000 among the machines for its standard clear bobbin. HD9 and 1600P are important exceptions.
PFAFF bobbin groups and IDT presser-foot checks
J, K and L bobbin listings are separate references. Match the machine group and keep IDT instructions with the chosen foot.
Husqvarna Viking bobbins: machine groups and exceptions
Green bobbins are not a universal Viking replacement. EMERALD, JADE and ONYX need particular attention.
Choose a sewing-machine needle by system, point and size
Needle size describes thickness. The system and point type must also suit the machine and fabric.
Choose an embroidery hoop by machine and sewing field
The hoop’s dimensions do not establish attachment compatibility. Check the supported machine and usable embroidery area.
Use & care
Thread loops under the fabric: check upper threading first
Loops underneath can come from the upper thread. Start with the thread path before replacing the bobbin case.
Wind a bobbin evenly without overfilling it
Start with an empty, undamaged bobbin of the correct style. The winder’s thread path controls the result.
Clean the Janome HD-3000 bobbin area
The HD-3000 manual shows how to remove lint and reinstall the holder using its alignment marks.
Buying advice
Choose a presser foot by attachment, stitch and machine fit
A foot’s job and its physical attachment are separate decisions. Check both before lowering the needle.