Source-backed model reference · US

Singer 3223 / 3229 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

• 9-11 (70-80) → Lightweight fabrics: thin cottons, voile, silk, muslin, interlocks, cotton knits, tricots, jerseys, crepes
• 11-14 (80-90) → Medium weight fabrics: cotton, satin, kettlecloth, sailcloth, double knits, lightweight woolens
• 14 (90) → Medium weight fabrics: cotton duck, woolen, heavier knits, terrycloth, denims
• 16 (100) → Heavyweight fabrics: canvas, woolens, outdoor tent and quilted fabrics, denims, upholstery (light to medium)
• 18 (110) → Heavy woolen, overcoat fabrics, upholstery fabrics, some leathers and vinyls

Insert and replace

The flat side of the shaft should be towards the back.

Other manual notes

• Replace needle often (approximately every other garment) and/or at first thread breakage or skipped stitches.

Manufacturer source

Singer 3223 Instruction Manual ↗

Source market: English · Checked October 20, 2026. Verify the full model label, fabric and current manual before sewing.

Check another machine · Needle size chart