163951
Stitch length regulator (401 / 500) for Singer 401, 401A, 403, 404 and 2 more
Original part (OEM)
Not checked yet
PorkForge replacement
Not made yet
Part facts
- Original part number
- 163951R1
- Manufacturer
- Singer
- Part type
- Other parts
- System
- Other parts
- Notes
- Stitch length regulator assembly for the Singer 401, 401A, 403, 404, 500 and 503. Out of stock at Sewing Parts Online.
- Last reviewed
- Oct 28, 2026 · record pf-sew-00010
Dimensions How to measure this part
Fits these machines
| Model | Years | Notes | Evidence |
|---|---|---|---|
| Singer 401 | Not recorded | — | Reported 1 |
| Singer 401A | Not recorded | — | Reported 1 |
| Singer 403 | Not recorded | — | Reported 1 |
| Singer 404 | Not recorded | — | Reported 1 |
| Singer 500 | Not recorded | — | Reported 1 |
| Singer 503 | Not recorded | — | Reported 1 |
Where to find one today
| Source | Condition | Price | Stock | Checked |
|---|---|---|---|---|
| Sewing Parts Online 1 | Not stated | $35.99 | Out of stock | Oct 28, 2026 |
Why it is hard to get
- Market evidence: Out of stock at Sewing Parts Online on 2026-10-28. 1
Can this part be made again?
Under reviewPhysical replacement
Stitch length mechanism with a lever; mostly metal and it sets feed motion, so a person must check whether any plastic part could be made. No dimensions published.
Under reviewSTL / FreeCAD file
Not decided yet.
Sources
Not affiliated with or endorsed by Singer or its successors. The name is used only to identify compatibility. Part numbers are shown for reference. Check fit against your own machine. Spot a mistake?
Verification checklist (2 of 8 met)
- ✕ OEM part number not yet verified from an OEM or dealer source
- ✕ Cited by one website only, and not an OEM or dealer source
- ✓ At least one compatible model with a source
- ✕ 1 kinds of fact beyond the name (aftermarket prices); 3 needed
- ✕ Original availability not yet checked
- ✓ Text and title are distinct
- ✕ On hold: Whether it can be made as a physical part is undecided (heat, load or food contact); waiting on an owner decision
- ✕ Not yet reviewed and signed off for search
Related parts
| Part no. | Part | Make | Fits | Original | PorkForge | Sources |
|---|---|---|---|---|---|---|
| 172007 | Spool pin (plastic) | Singer | 15-91, 177, 177C, 192, 192K +45 more | Not checked | Research only | 2 |