Holo-krome 78076 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 78076 is a hex socket cap screw designed for secure, high-strength fastening in mechanical assemblies, equipment fabrication, and maintenance applications. It features a 5/16-18 UNC thread with a 3/4-inch length under the head and is fully threaded from tip to head. The drive is a 1/4-inch hex socket, requiring a standard hex key or Allen driver. Constructed from 18-8 stainless steel with a bright, uncoated finish, it resists corrosion in wet or mildly corrosive environments. This fastener meets ASME B18.3 and ASTM F837 standards, making it suitable for professional mechanical and industrial service work.

This screw is used in a wide range of trade and industrial applications where a flush or recessed drive is needed in tight spaces. Common install scenarios include HVAC equipment assemblies, pump and motor mounting, plumbing fixtures, electrical enclosures, and general mechanical equipment. The 5/16-18 UNC thread is a widely specified coarse thread in both OEM and field-service contexts. The stainless steel construction makes it a practical choice in environments where carbon steel hardware would corrode, including outdoor, marine-adjacent, or high-humidity conditions.

Key Features

• 5/16-18 UNC fully threaded coarse-thread fastener
• 3/4-inch length under head for precise fitment in standard applications
• 1/4-inch hex socket drive for use with standard Allen keys or hex bit drivers
• 18-8 stainless steel construction with bright, uncoated finish for corrosion resistance
• Meets ASME B18.3 and ASTM F837 dimensional and material standards

Compatibility

Designed as an OEM-style replacement or stock fastener for applications requiring a 5/16-18 UNC hex socket cap screw with 3/4-inch length under head per ASME B18.3 and ASTM F837 specifications.

Installation Notes

Installation is typically performed by mechanical technicians, millwrights, HVAC service professionals, or plumbers as part of equipment assembly or field repair. Always de-energize and lock out electrical equipment before replacing fasteners in or near live assemblies. Use a properly sized 1/4-inch hex key or driver to avoid rounding the socket. Do not mix stainless steel fasteners with dissimilar metals in applications where galvanic corrosion is a concern.