Hex Head Bolt 1/2-20 x 4 Grade 5

The ALLSTAR PERFORMANCE Hex Head Bolt 1/2-20 x 4 Grade 5 is a precision fastener engineered for high-stress mechanical assemblies where reliability and strength are non-negotiable. This 1/2-inch diameter, 4-inch length bolt features a 3/4-inch hex head and Grade 5 steel construction with zinc oxide plating, delivering the tensile strength and corrosion resistance required in demanding applications across automotive, off-road, and mechanical assembly environments.

Grade 5 steel bolts meet SAE J429 specifications and offer approximately 92,000 PSI tensile strength—a significant step up from Grade 2 fasteners. The 1/2-20 thread specification (1/2-inch diameter with 20 threads per inch) provides fine-pitch engagement for precise tension and reduced vibration loosening, critical in vehicles and equipment subjected to continuous movement or mechanical shock. The zinc oxide finish provides baseline corrosion protection suitable for protected indoor and moderate outdoor environments, though additional corrosion management may be necessary in high-salt or extreme-weather conditions.

This bolt is commonly used for securing engine components, suspension assemblies, frame connections, and structural fastening in automotive restoration, off-road vehicle recovery systems, and mechanical equipment assembly. The 4-inch length accommodates stacked components and thick material sections where shorter fasteners would be insufficient. Users select Grade 5 bolts when standard Grade 2 fasteners have failed under load or when manufacturers specify higher tensile requirements for safety-critical joints.

Individual bolt sale allows operators and technicians to source exact replacements without purchasing bulk packs, reducing waste on repair and fabrication projects. The universal design ensures compatibility across most standard bolt applications where metric or SAE specifications call for 1/2-20 fastening.