उत्पाद वर्णन
B1903-552-00 Left Screw
This left-hand thread screw secures a specific mechanism component that rotates in a direction requiring reverse threading to stay locked in place.
Fits
- Jack F4, F5, F6 and JUKI single needle lockstitch machines
Why Replace It
Using a standard right-hand screw in this position will loosen under normal rotation. This left-hand thread screw is essential for the part to stay secure.
अक्सर पूछे जाने वाले प्रश्न
Why does this need a left-hand thread specifically?
The component it secures rotates in a direction that would back out a standard screw over time — left-hand threading keeps it locked instead.
