Fabco part 688-0245 or 6880245 is a 1-1/4-12 hex 2B jam nut listed in the illustrated parts manuals for seven Fabco transfer case models: TC-140, TC-141, TC-142, TC-1421, TC-143, TC-1702, and TC-270. The 1-1/4-12 designation identifies a 1-1/4 inch major diameter with 12 threads per inch (UNF fine thread), and the 2B class indicates a standard internal-thread tolerance fit used in precision fastener applications. This nut appears in multiple positions across those transfer case manuals, making it a commonly needed service fastener for Fabco-equipped trucks. Call us to confirm the correct quantity and position for your specific unit.
Features
Fabco part number 688-0245 or 6880245
1-1/4 inch major diameter, 12 threads per inch (UNF fine thread)
2B thread class - standard tolerance for precision fastener fit
Listed in parts manuals for TC-140, TC-141, TC-142, TC-1421, TC-143, TC-1702, and TC-270
Covers multiple item positions across Fabco transfer case models
Genuine Fabco part, sold by Pro Gear and Transmission
Tech Specs
- Thread size: 1-1/4-12 (1-1/4 in. major diameter, 12 TPI UNF)
- Thread class: 2B (standard internal thread tolerance)
- Type: Hex jam nut
- Fabco part number: 688-0245 or 6880245
- Fits: TC-140, TC-141, TC-142, TC-1421, TC-143, TC-1702, TC-270
