Value Collection 401598BR Hex Head Cap Screw 7/8-9 X 4.5in

Product Description

The VALUE COLLECTION 401598BR is a partially threaded hex head cap screw designed for fastening applications where corrosion resistance and structural integrity are critical. Manufactured from Grade 316 stainless steel with a bright, uncoated finish, this fastener measures 7/8-9 thread size with a 4-1/2 inch length under the head. The UNC thread standard and 1-5/16 inch hex key size make it compatible with standard SAE tooling. It is suited for industrial, marine, chemical processing, and plumbing environments where exposure to moisture, salt, or corrosive media demands a higher-grade alloy fastener than standard 304 stainless.

This cap screw is commonly used in heavy mechanical assemblies, structural connections, and equipment mounting applications across HVAC, plumbing, and industrial maintenance trades. Its Grade 316 stainless composition — which includes molybdenum for enhanced chloride resistance — makes it a preferred choice for coastal installations, wastewater systems, pool equipment, and any application subject to aggressive environmental exposure. Partial threading allows for greater shank strength and is typical in applications requiring a grip length through thicker materials.

Key Features

• Grade 316 stainless steel construction for superior corrosion resistance in harsh or marine environments
• Partially threaded shank provides increased tensile strength through the grip length
• 7/8-9 UNC thread for compatibility with standard inch-series nuts and tapped holes
• 4-1/2 inch length under head accommodates thick structural members and stacked assemblies
• Bright, uncoated finish — no added coatings that could contaminate chemically sensitive installations
• 1-5/16 inch hex drive size works with standard combination wrenches and impact sockets

Compatibility

Designed for use with standard 7/8-9 UNC inch-series hex nuts, flat washers, and tapped holes in Grade 316 stainless or compatible alloy components.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using appropriate hand or power tools rated for the hex drive size. Verify thread engagement and mating hardware are also stainless or a compatible alloy to prevent galvanic corrosion. Apply an anti-seize compound approved for stainless fasteners to prevent galling during installation and future removal. Always follow applicable mechanical and structural codes for fastener torque and joint design.