Keep your sewing, quilting and embroidery projects moving with the BERNINA Jumbo Bobbin . Designed for machines fitted with the B9 Hook or BERNINA Hook system, this high-capacity bobbin holds up to 70% more thread than a standard bobbin, helping reduce stops to rewind or replace the lower thread.
Part number 033436.54.00 is the individual BERNINA jumbo bobbin used across compatible 4, 5 and 7 Series machines and selected newer models. Its sensor surface also works with the lower-thread monitoring system on machines equipped with that feature.
Why keep extra BERNINA jumbo bobbins ready?
- More sewing between bobbin changes: Holds up to 70% more thread than a standard bobbin.
- Useful for longer projects: A practical choice for quilt piecing, garment construction, machine embroidery and decorative stitching.
- Less project disruption: Pre-wind commonly used colours before you begin sewing.
- Lower-thread sensor support: The reflective sensor surface allows compatible machines to monitor the lower thread.
- Correct BERNINA fit: Made for the B9 Hook and BERNINA Hook systems rather than generic Class 15, CB-hook, rotary-hook or M-class systems.
- Easy thread organisation: Keep separate bobbins prepared for piecing, embroidery, topstitching and everyday sewing.
Verified product specifications
| Brand | BERNINA |
|---|---|
| Product | Individual jumbo bobbin |
| BERNINA part number | 033 436 54 00 |
| Two Petals SKU | 033436.54.00 |
| Hook system | B9 Hook and BERNINA Hook |
| Thread capacity | Up to 70% more than a standard bobbin |
| Sensor feature | Reflective surface for compatible lower-thread monitoring systems |
| Pack contents | 1 individual bobbin |
BERNINA Jumbo Bobbin compatibility
This bobbin is selected by hook system and part number , not simply by the BERNINA name or the machine’s series number. BERNINA’s accessory information identifies part 033436.54.00 for B9 Hook and BERNINA Hook machines.
Manufacturer-listed compatible models
- 4 Series: B 435, B 475 QE and B 480
- 5 Series: B 500 E, B 535, B 540, B 570 QE and B 590
- 7 Series: B 700 E, B 710, B 720, B 750 QE, B 770 QE, B 780 and B 790 PLUS
Current compatibility references also associate part 033436.54.00 with models and variants including the B 485, B 700 PRO, B 735, B 735 PRO, B 740, B 770 QE PLUS, B 790, B 790 PRO and B 990. Because model ranges and regional names can change, check the bobbin part number in your manual or contact Two Petals before ordering for a model that is not in the manufacturer-listed group above.
If you are unsure which hook your machine uses, see the Two Petals guide to choosing the correct sewing-machine bobbin or browse our range of BERNINA accessories .
Important compatibility exclusions
- BERNINA 8 Series: These machines use a separately listed 8 Series jumbo bobbin; do not select this part solely because both products are called “jumbo bobbins”.
- BERNINA Q Series: Q Series quilting machines use an M-class bobbin system.
- BERNINA 3 Series and older machines: Many use CB-hook, rotary-hook or another bobbin format rather than this jumbo bobbin.
- bernette machines: Do not assume compatibility. bernette models use several different bobbin systems and require model-specific checking.
- Generic Class 15 bobbins: Similar appearance does not establish compatibility. Use the bobbin specified for your machine’s hook system.
Lower-thread sensor information
The bobbin has a silver reflective sensor surface used by compatible BERNINA lower-thread monitoring systems. The notification feature is provided by the sewing machine, so it will only operate if your particular model is equipped with a lower-thread sensor and the feature is enabled.
BERNINA advises keeping the sensor surface clean and protecting it from scratches. A dirty or damaged reflective area may prevent a sensor-equipped machine from reading the remaining lower thread correctly. Store spare bobbins so their silver surfaces do not rub against hard or abrasive objects.
Ideal for sewing, quilting and embroidery
Extra bobbins are particularly useful when a project requires repeated stitching or several thread colours. Wind a set before starting so that you can move efficiently between construction seams, quilt piecing, free-motion work, appliqué and embroidery without stopping to empty or rewind the same bobbin.
- Long garment seams and dressmaking projects
- Patchwork and quilt piecing with a consistent thread colour
- Machine quilting and free-motion stitching
- Machine embroidery with multiple lower-thread bobbins prepared in advance
- Decorative stitching and repeated motifs
- Batch sewing, alterations and general studio use
Buying summary
Choose this bobbin when your machine documentation specifies BERNINA part 033436.54.00 or identifies the machine as using the B9 Hook or BERNINA Hook jumbo bobbin system . It is a useful spare for reducing bobbin changes, preparing several thread colours and maintaining the operation of compatible lower-thread monitoring features.
Frequently asked questions
Which BERNINA bobbin is part number 033436.54.00?
It is the individual high-capacity bobbin for compatible B9 Hook and BERNINA Hook sewing and embroidery machines.
How much more thread does a BERNINA jumbo bobbin hold?
BERNINA specifies a capacity of up to 70% more thread than a standard bobbin. The actual length wound onto it will vary with the type and thickness of thread.
Is this the bobbin for a BERNINA B 435 or B 475 QE?
Yes. Both the B 435 and B 475 QE are manufacturer-listed for this jumbo bobbin system.
Does it fit the BERNINA B 535, B 570 QE and B 590?
Yes. These current-generation 5 Series models use the BERNINA Hook jumbo bobbin. The embroidery-only B 500 E is also included in the manufacturer’s compatibility information.
Does every compatible machine provide a low-bobbin warning?
No. The bobbin supports the reflective sensing system, but alerts depend on the features of the individual machine. A compatible model without a lower-thread sensor can still use the correct bobbin normally.
Can I use this in a BERNINA 8 Series machine?
No. BERNINA lists a different individual jumbo bobbin for the 8 Series. Match the exact part number specified for your machine rather than relying on the word “jumbo”.
Can I substitute a standard Class 15 or CB-hook bobbin?
No. Bobbin dimensions and hook systems are machine-specific. BERNINA states that each hook system has a matching bobbin and bobbin case, so use the specified format for reliable fit and stitch formation.
Does this listing include a bobbin case?
No. This listing includes one individual bobbin. Bobbin cases for regular sewing, embroidery or specialty bobbinwork are separate accessories.
Why should I buy more than one spare bobbin?
Several bobbins allow you to prepare frequently used colours or project-specific threads in advance. This can be especially convenient for embroidery, quilt piecing, batch sewing and projects that alternate between construction and decorative thread.
How should I store a sensor-compatible BERNINA bobbin?
Keep the bobbin clean and protect the silver sensor surface from scratches. When using a BERNINA accessory box, follow the orientation shown in your machine manual so the reflective sides do not rub against the holder.
How do I confirm compatibility if my exact model is not listed?
Check the accessories or bobbin section of your machine manual for part number 033436.54.00 and confirm that the machine uses a B9 Hook or BERNINA Hook. You can also contact Two Petals with the complete model name before purchasing.
