Holo-krome 78082 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 78082 is a hex socket cap screw designed for applications requiring a flush, recessed-drive fastener with reliable holding strength. It features a 5/16-18 UNC thread size, a 1-1/4 inch length under head, and a 1/4 inch internal hex drive. Manufactured from 18-8 stainless steel with a bright uncoated finish, it resists corrosion in wet and mildly corrosive environments. The fully threaded shank provides maximum thread engagement along the entire fastened length. This fastener meets ASME B18.3 and ASTM F837 standards, making it suitable for professional trade and mechanical assembly work where dimensional consistency and material traceability are required.

This screw is used across HVAC, plumbing, electrical, and general mechanical applications where a socket-drive cap screw is specified. The 5/16-18 UNC thread is a common coarse-thread size found in equipment panels, brackets, access covers, pump housings, and structural assemblies. The stainless steel construction makes it a practical choice for outdoor enclosures, pool equipment, and other installations where mild corrosion resistance is needed. It is installed using a standard 1/4 inch hex key or Allen driver.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes
• 1-1/4 inch length under head for medium-depth fastening applications
• Fully threaded shank maximizes thread engagement and clamping force
• 18-8 stainless steel construction provides corrosion resistance in wet or outdoor environments
• Bright uncoated finish maintains accurate dimensional tolerances
• Meets ASME B18.3 and ASTM F837 standards for verified mechanical performance

Compatibility

Designed as a standard replacement or service fastener for any application specifying a 5/16-18 UNC hex socket cap screw with a 1-1/4 inch length under head per ASME B18.3.

Installation Notes

Install and remove using a 1/4 inch hex key or Allen driver. De-energize and isolate the equipment before replacing fasteners on any electrical, HVAC, or mechanical assembly. Do not overtighten stainless steel fasteners, as the material is susceptible to galling — apply an appropriate anti-seize compound when torque retention is critical. Follow applicable equipment manufacturer torque guidelines and relevant codes for the trade involved.