Value Collection 30589 Hex Head Cap Screw 5/16-18 316 Ss

Product Description

The VALUE COLLECTION 30589 is a 5/16-18 x 2.5-inch hex head cap screw manufactured from Grade 316 stainless steel. Grade 316 stainless offers superior corrosion resistance compared to Grade 304, making it the correct choice for wet, coastal, or chemically aggressive environments. The fastener uses a Unified National Coarse (UNC) thread form with a 1/2-inch hex drive. Length is measured under the head. This type of fastener is installed by plumbers, pipefitters, HVAC technicians, pool service professionals, and general contractors whenever a corrosion-resistant threaded connection is required in demanding service conditions.

This screw is suited for residential and commercial applications where moisture, salt air, chlorine exposure, or chemical contact makes standard carbon steel or Grade 304 fasteners inadequate. Typical uses include pool and spa equipment mounting, marine-adjacent HVAC installations, outdoor electrical enclosure assembly, and plumbing fixture attachment. The UNC thread pattern is compatible with standard inch-series nuts, washers, and tapped holes commonly found across mechanical, plumbing, and HVAC equipment.

Key Features

• Grade 316 stainless steel construction for high corrosion resistance in wet and chlorinated environments
• 5/16-18 UNC thread for compatibility with standard inch-series hardware
• 2.5-inch length under head for moderate-depth fastening applications
• 1/2-inch hex drive compatible with standard wrenches and sockets
• Inch system of measurement for direct replacement in existing inch-standard assemblies

Compatibility

Designed as a standard inch-series hex head cap screw for use with any UNC 5/16-18 tapped hole, nut, or threaded insert requiring Grade 316 stainless steel corrosion resistance.

Installation Notes

Power down or de-energize any equipment before fastener replacement in electrical or mechanical enclosures. Use a properly sized 1/2-inch wrench or socket to drive this fastener and avoid over-torquing, which can gall stainless steel threads. Applying an anti-seize compound rated for stainless fasteners is standard practice to prevent thread galling during installation and future removal. Follow applicable mechanical and plumbing codes for torque requirements specific to the assembly.