Source-backed model reference · US

Brother XM2701 / XR3774 / GX37 needle size

The exact machine name and needle system determine fit. This page transcribes the cited manufacturer manual and keeps fabric use, insertion and specialty-needle notes together.

Fabric and size chart

• Medium weight fabrics (broadcloth, taffeta, flannel, gabardine) → 75/11–90/14
• Thin fabrics (lawn, georgette, challis, satin) → 65/9–75/11
• Thick fabrics (denim, corduroy, tweed) → 90/14–100/16 (100/16 with #30 thread)
• Stretch fabrics (jersey, tricot) → Ball point needle (gold colored) 75/11–90/14
• Easily frayed fabrics → 65/9–90/14
• Transparent nylon thread → 90/14 to 100/16, regardless of fabric or thread

Insert and replace

With the flat side of the needle toward the back of the machine, insert the needle until it touches the needle stopper, then tighten the needle clamp with an oval screwdriver.

Twin-needle or specialty notes

Twin needle (2.0/75 needle), part code X57521-021 (optional accessory); stitch width not set above "2.5"; foot J. Use only twin needles made for this machine (X57521-021: 2.0/75 with a 2 mm width). Thread twin needle by hand; do not use needle threader

Other manual notes

• Needle threader can be used with 75/11 through 100/16 home sewing machine needles, not with 65/9 (models with threader).
• Factory recommended ball point needle is "HG-4BR" (Organ).

Manufacturer source

Brother XM2701 Operation Manual (English/Spanish) ↗

Source market: US English (bilingual English/Spanish) · Checked October 20, 2026. Verify the full model label, fabric and current manual before sewing.

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