The Fabco 688F-0342 or 688F0342 is a 1/2-20 UNJF-3B hex high UTS nut, sold as a single-unit pack. The UNJF-3B designation indicates a unified national fine thread form with a Class 3B internal thread tolerance, a close-tolerance specification used where secure, precise fastening is required in heavy-duty truck applications. Fabco components are genuine OEM parts. Pro Gear and Transmission carries this nut for customers who need an exact-spec fastener to match Fabco drivetrain hardware. Call us to confirm this is the correct part for your application before ordering.
Features
Fabco part numbers: 688F-0342 or 688F0342
Thread specification: 1/2-20 UNJF-3B (unified national fine, Class 3B internal thread)
Hex high UTS nut configuration
Unit pack quantity: 1 (sold individually)
Genuine OEM Fabco part
Tech Specs
- Thread Size: 1/2-20
- Thread Form: UNJF-3B (Unified National Fine, Class 3B Internal Tolerance)
- Nut Style: Hex High UTS
- Unit Pack: 1
