Fabco nut, part number 688-0634 or 6880634, is a 1-20 self-locking nut used across Fabco transfer case, PTO, and steerable drive axle assemblies. The self-locking design resists loosening under vibration, which matters on driveline and axle hardware that sees constant load and road shock. This is a genuine Fabco component sold by Pro Gear and Transmission. If you are matching it to a specific Fabco unit or replacing existing hardware, give us a call to confirm proper fit for your application.
Features
Genuine Fabco part number 688-0634, also listed as 6880634
1-20 thread self-locking nut
Self-locking design resists loosening from vibration
Used on Fabco transfer case, PTO, and steerable drive axle assemblies
UPC 193174432057
