Value Collection MP30589 Hex Head Cap Screw 5/16-18

Product Description

The VALUE COLLECTION MP30589 is a hex head cap screw designed for general fastening applications requiring corrosion resistance. It carries a 5/16-18 UNC thread specification and measures 2.5 inches in length under the head. The screw is manufactured from Grade 316 stainless steel, which provides superior resistance to chlorides and oxidizing environments compared to standard 304 stainless. The hex drive measures 0.5 inches across the flats. This fastener is installed by maintenance technicians, plumbers, pipefitters, and HVAC mechanics wherever a reliable, corrosion-resistant threaded connection is needed.

This cap screw is suited for use in wet, marine, chemical, or outdoor environments where carbon steel hardware would corrode prematurely. Common applications include equipment mounting, pipe support bracketing, enclosure assembly, and general mechanical fastening in corrosive or high-moisture settings. The 5/16-18 UNC thread form is a standard inch-series coarse thread compatible with a wide range of off-the-shelf nuts, inserts, and tapped holes encountered in commercial and industrial equipment.

Key Features

• Grade 316 stainless steel construction for excellent resistance to chloride and corrosive environments
• 5/16-18 UNC coarse thread for broad compatibility with standard inch-series fastener hardware
• 2.5 inches length under head suits medium-depth clamping and through-bolt applications
• 0.5 inch hex head for use with standard wrenches and hex sockets
• Inch measurement system for direct replacement in standard US mechanical assemblies

Compatibility

Designed as a standard inch-series hex head cap screw for use wherever a 5/16-18 UNC fastener in Grade 316 stainless steel is specified. Compatible with any standard 5/16-18 nut, washer, or tapped hole conforming to UNC thread standards.

Installation Notes

Install using a 0.5 inch open-end wrench, box wrench, or hex socket. Ensure mating threads are clean and free of debris before assembly. When fastening into tapped holes in dissimilar metals, apply an anti-seize compound to prevent galling, which is a common issue with stainless steel fasteners. Do not overtighten, as stainless steel cap screws are susceptible to thread galling and seizure under excessive torque.