Value Collection 401331PS Hex Head Cap Screw 1/2-13 X 7 in

Product Description

The VALUE COLLECTION 401331PS is a partially threaded hex head cap screw designed for high-strength fastening applications where corrosion resistance is critical. Manufactured from Grade 316 stainless steel with a bright, uncoated finish, this fastener measures 1/2-13 thread size at 7 inches under the head and follows the Unified National Coarse (UNC) thread standard. The 3/4-inch hex drive size accommodates standard wrenches and sockets. This screw is used by millwrights, plumbers, HVAC installers, electricians, and industrial maintenance technicians working in corrosive or marine-adjacent environments.

The 401331PS is suited for structural and mechanical assemblies in wet, chemical, or saltwater-exposed environments where carbon steel fasteners would corrode prematurely. Typical applications include pipe flange connections, equipment mounting, pump and valve assemblies, and general industrial fabrication. Its partial threading preserves shank strength along the unthreaded portion, making it appropriate for applications requiring a bearing surface or precise grip length.

Key Features

• Grade 316 stainless steel construction provides superior resistance to chlorides and corrosive media compared to Grade 304
• Partially threaded shank offers a smooth bearing zone for shear-load and close-tolerance fit applications
• UNC 1/2-13 thread pattern is widely compatible with standard nuts, inserts, and tapped holes in inch-based assemblies
• Bright, uncoated finish maintains dimensional integrity without plating buildup on thread flanks
• 3/4-inch hex drive accommodates standard combination wrenches, box-end wrenches, and impact sockets

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for standard 1/2-13 UNC tapped holes and matching hex nuts or heavy hex nuts in inch-measurement assemblies.

Installation Notes

Installation is performed with a 3/4-inch wrench, socket, or impact driver. Torque to the specification required by the application engineer or equipment manufacturer for Grade 316 stainless steel of this diameter. Apply an anti-seize compound rated for stainless fasteners before installation to prevent galling, which is common with austenitic stainless steel under high torque. De-energize, depressurize, and lock out any system before replacing fasteners on pressurized piping, electrical enclosures, or mechanical equipment.