The Fabco Nut, 1 1/2-18 thread (part number 688-0639 or 6880639) is a genuine Fabco replacement fastener. The 1 1/2-18 designation identifies a 1.5-inch diameter fine-thread specification, a thread form commonly found in heavy-duty drivetrain and axle assemblies where precise torque retention matters. Fabco is known for transfer case, power takeoff, and steerable drive axle components, and this nut is sourced to serve those product lines. Available from Pro Gear and Transmission. Not sure this is your part? Give us a call to confirm proper fit for your application.
Features
Genuine Fabco replacement nut
1 1/2-18 thread specification (1.5-inch diameter, fine thread)
Applies to Fabco transfer case, PTO, and steerable drive axle product lines
Part number: 688-0639 or 6880639
UPC: 193174470028
Tech Specs
- Thread Size: 1 1/2-18 (1.5-inch diameter, fine thread)
- Part Number: 688-0639 or 6880639
- Brand: Fabco
