Dimension - 4"  x  0.6"
Weight  -  120 gm
 
U-bolts and nuts for a gearbox typically secure the gearbox to its mounting or connect components like the driveshaft or other transmission parts. The specific size, thread, and type depend on the gearbox model and vehicle. Here’s a breakdown based on available information:
 
General Use: U-bolts are used in automotive applications to secure components like axles, driveshafts, or gearbox mounts. They often come with hex nuts, lock nuts, or deep nuts for added security, especially in high-vibration environments like a gearbox.
Sizes and Specifications: Common U-bolt sizes for gearbox-related applications include:
Driveshaft U-bolts: Often 5/16-24 fine thread with hex lock nuts (e.g., for 1965-73 Mustang, Shelby, Cougar).
Axle U-bolts: For example, 1/2-20 UNF for 3.00" axle tubes or 7/16-20 UNF for 2.38" tubes.
Gearbox Mounting Bolts: For some vehicles (e.g., VW Golf), gearbox-to-engine bolts are M12 x 55mm or M12 x 62mm, with specific part numbers like N 103 378 03.
 
Materials and Finishes: U-bolts and nuts are often made of carbon steel, stainless steel, or zinc-plated steel for corrosion resistance. Some include nyloc nuts for vibration resistance (max torque ~15 ft-lb).