Source-backed model reference · US

Janome MyLock 634D / 634D 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

• Light weight (Organdy, Georgette, Lawn, Crepe de chine, Lining) → HA-1 SP No. 11
• Medium weight (Cotton, Linen, Satin, Ordinary fabric) → HA-1 SP No. 11 ~ 14
• Heavy weight (Tweed, Coating, Denim, Doeskin, Thick fabric) → HA-1 SP No. 14
• Knits (Knitted fabric) → HA-1 SP No. 11 ~ 14

Insert and replace

Insert needle with the flat side to the back. Right needle: until the top touches the stopper pin. Left needle: until the top touches the edge of the needle bar. Left needle sits higher than the right.

Other manual notes

• Do not use any needle which is bent or blunt.

Manufacturer source

Janome MyLock 634D Instruction Book ↗

Source market: US (foot controller note 'For U. S. A. market only') / English · Checked October 20, 2026. Verify the full model label, fabric and current manual before sewing.

Check another machine · Needle size chart