3J-9196

Technical Specifications: Caterpillar 3J-9196 Hex Jam Nut

The Caterpillar 3J-9196 Hex Jam Nut (Lock Nut) is a heavy-duty, high-tensile threaded fastener. It is primarily utilized within valve mechanical groups, rocker arm assemblies, and heavy machine mounting systems to lock specific adjustments in place and prevent thread loosening from engine vibrations and constant cycling.

1. Core Dimensions & Weight

Thread Size: 1/2 inch
Holes Thread Pitch (TPI): 20 threads per inch (1/2-20 Fine Thread)
Component Height / Thickness: 7.87 mm (0.31 in)
Drive Size / Hex Width Across Flats: 19.05 mm (3/4 in)
Average Weight: 0.013 kg (0.03 lbs)

2. Material & Manufacturing Specs

Material Grade: Premium SAE J995 Grade 8 (or ISO Class 12 equivalent) high-strength carbon steel.
Coating & Finishing: Corrosion-resistant coating engineered to withstand extreme thermal variations within oil-wetted engine compartments.
Type Structural Profile: Hexagonal Low-Profile Jam Nut design optimized for tight spaces where full-height locknuts are unsuited.

3. Equipment & Engine Compatibility

This structural fastener is standard hardware deployed across a diverse variety of heavy machinery networks and large engine blocks:

Diesel & Gas Engine Platforms: CAT 3508, 3512, 3516 (including rocker arm pushrod lock assemblies), and gas engine series G3508, G3512, G3516, G3520 (variants B, C, E).
Power Systems & Alternators: Caterpillar SR4, SR4B, SR4BHV, and SR5 generator setups.
Backhoe Loaders & Earthmoving Equipment: Caterpillar 416B, 416C, 416D, 420D, 424D, 426C, 428B, 428C, 428D, and 430D utility systems.
Large Mining Machinery: Integrated within minor mechanical linkages of large wheel loaders like the CAT 992C.