Fabco nut 688-0642 or 6880642 is a self-locking hex nut with a 1-3/4-16 UN-3B thread. The UN-3B classification is a fine-thread, class 3B (tight tolerance) internal thread, and the self-locking design resists back-off under vibration, which makes it a common fastener on Fabco transfer case, PTO, and steerable drive axle assemblies. This is a genuine Fabco part sold by Pro Gear and Transmission. Not sure this is your part? Give us a call and we can help confirm the correct fastener for your application.
Features
Fabco part number 688-0642 or 6880642
Thread size 1-3/4-16 UN-3B fine thread, class 3B internal fit
Hex nut profile for standard wrench service
Self-locking design resists loosening from vibration
Genuine Fabco fastener
Tech Specs
- Brand: Fabco
- Part number: 688-0642 or 6880642
- Type: Hex nut, self-locking
- Thread: 1-3/4-16 UN-3B
- UPC: 193174382604
