11319001 Fixed Knife / Blade / Cutter (Secant Knife) JACK A2, A2S, A3, A4, A5, A6 Under Bed Trimmer (UBT) Single Needle Lock-Stitch Machine

Fixed knife (secant knife), part no. 11319001, for Jack A2, A2S, A3, A4, A5 and A6 under bed trimmer (UBT) single needle lockstitch machines. It is the stationary blade the moving knife cuts against, so replace it when thread trimming turns ragged or the machine stops cutting cleanly.

Fits

• Jack A2, A2S, A3, A4, A5, A6 under bed trimmer (UBT) lockstitch machines
• Part no. 11319001

When to Replace It

• Thread is left uncut or is chewed instead of cut after trimming.
• The cutting edge looks chipped, worn round or nicked.
• You hear scraping where the two blades meet.

How to Replace the Fixed Knife

1. First, switch the machine off and unplug it, then tilt the head back to reach the trimmer.
2. Next, loosen the screw holding the old fixed knife and note its exact position.
3. Then fit the new knife in the same position and tighten the screw.
4. Finally, run the trimmer a few times on scrap thread and check the cut is clean.

FAQ

Do I need to replace the moving knife too?

Not always. If only the fixed knife is chipped, replacing it alone can restore the cut. If the trimmer still drags thread afterwards, inspect the moving knife as well, since a worn pair cuts poorly even when one blade is new.

How do I confirm this fits my machine?

Match the part number and model shown in the Fits list against your machine’s model plate. If you are unsure, send us a photo of the old part on WhatsApp before ordering and we will confirm it.

More parts for these models: Jack A2 / A2S / A3 / A4 / A5 spare parts.