Holo-krome 78078 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 78078 is a hex socket cap screw with a 5/16-18 UNC thread size and a 7/8-inch length under head. It is fully threaded and manufactured from 18-8 stainless steel with a bright, uncoated finish. The 1/4-inch hex drive accepts a standard hex key or Allen wrench. This fastener meets ASME B18.3 and ASTM F837 standards, making it appropriate for structural and mechanical assemblies that require corrosion-resistant hardware. It is installed by maintenance technicians, millwrights, and field service professionals across industrial, commercial, and mechanical system applications.

This screw is suited for use in equipment assemblies, brackets, enclosures, and mechanical components where a recessed-drive fastener is preferred for flush or low-profile installation. The stainless steel construction makes it a practical choice for environments with moisture exposure or where galvanic compatibility with stainless hardware is required. It is sold in minimum order quantities of 10 units.

Key Features

• 5/16-18 UNC thread for compatibility with standard unified coarse-thread tapped holes
• 7/8-inch length under head - fully threaded for maximum thread engagement
• 18-8 stainless steel construction for corrosion resistance
• Bright, uncoated finish - no additional coating that could affect thread tolerance
• 1/4-inch hex socket drive for use with standard hex keys or hex bit drivers
• Meets ASME B18.3 and ASTM F837 fastener standards

Compatibility

Designed as a standard hex socket cap screw for use in any application with a 5/16-18 UNC tapped hole requiring a 7/8-inch fully threaded fastener in stainless steel.

Installation Notes

Installation is performed using a 1/4-inch hex key or matching hex bit driver. Ensure the mating tapped hole is clean and free of debris before threading to avoid galling, which is common with stainless steel fasteners - apply an appropriate anti-seize compound if required. De-energize or lock out any associated equipment before fastener service per applicable safety procedures. Follow the applicable mechanical or structural code requirements for torque and fastener spacing.