Direct Sewing · Singer parts & accessories
Singer Overlocker Knife Set 412585 / 550449
Replace worn cutting blades with a matched upper and lower knife set for the correct overlocker setup.
Part / product referenceUpper 412585 / Lower 550449
Will it fit my machine?
We have not established an exact manufacturer model list for this supplied item. Please send us your full model number and the original part reference or a clear photo before ordering.
Product details
- Includes the two knife references shown above.
- Compare both blades, mounting points and cutting edges.
- Blade setting matters; use the machine's service instructions for installation.
Let us help you choose
Send us the full machine model and the part reference above. A photo of the original part helps us check the fitting.
Ask Direct Sewing Singer model & part finderFitting sources and instructions
Reviewed September 2026. Regional names, packs and part revisions can differ. Use these references together with your machine manual.