Brother BM3700
Mechanical sewing machine
Brother lists the SA156 clear plastic Class 15 bobbin for the BM3700.
Verified compatibility
3 verified relationships.
| Part or system | Relationship | Status | Evidence note |
|---|---|---|---|
| Brother SA156 Bobbin | Officially compatible | CONFIRMED | Brother lists the SA156 clear plastic Class 15 bobbin for the BM3700. |
| Brother SA122 Non-Stick Foot | Officially compatible | CONFIRMED | Brother lists BM3700 for the SA122 non-stick foot. |
| Brother SA125 1/4-inch Piecing Foot | Officially compatible | CONFIRMED | Brother lists BM3700 for the SA125 1/4-inch piecing foot. |
Machine specifications
- Confirmed bobbin
- Brother SA156 / Class 15
- Built-in stitches
- 37
- Stitch functions
- 74
- Buttonhole styles
- 1 one-step
- Included presser feet
- 6
- Bobbin loading
- Quick-Set drop-in
- Maximum sewing speed
- 800 stitches per minute
- Maximum stitch width
- 5 mm
- Maximum stitch length
- 4 mm
- Thread tension
- Manual
About this machine
The Brother BM3700 is a mechanical sewing machine with 37 built-in stitches, a one-step buttonhole, six included presser feet and a Quick-Set drop-in bobbin. Brother lists a maximum sewing speed of 800 stitches per minute, 5 mm maximum stitch width and 4 mm maximum stitch length.
Identifying the mechanical controls
BM3700 uses a stitch dial and manual thread tension. These controls help distinguish it from computerized Brother machines that may share some accessories, especially when checking a secondhand machine without its manual.
Documented bobbin and optional feet
Brother lists the BM3700 for the SA156 bobbin and the optional SA120 gathering, SA129 free-motion and SA140 walking feet. The Quick-Set drop-in arrangement or a similar-looking shank on another machine is not sufficient evidence that the same accessories fit.
Stitches, functions and included feet
Brother’s 37 built-in stitches and 74 stitch functions describe different counts, not two competing stitch totals. The six included feet describe the original package, while optional-accessory compatibility is a separate question when buying a used machine.
What this machine is used for
- Garment sewing
- Home-decor sewing
- Utility and decorative stitching
- Basic buttonholes and hemming
Sources and scope
This page is limited to the exact compatibility relationships listed on the United States official source; confirm other accessories in the machine manual.
- SA156 Clear Plastic Bobbins 10-Pack Brother USA · Official accessory compatibility page · Tier 2
- Brother BM3700 product page Brother USA · Official machine product page · Tier 2
- SA122 Non-Stick Foot for 5mm Stitch Width Sewing Machines Brother USA · Official accessory compatibility page · Tier 1
- SA125 1/4-inch Piecing Foot Brother USA · Official accessory compatibility page · Tier 1
Catalog source-link check completed September 2026. This maintenance check did not reverify every factual claim. See how factual verification differs from maintenance checks.