Value Collection 451620BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451620BR is a heavy-duty hex head cap screw designed for high-strength bolted assemblies. It features a 1-1/4-12 UNF thread and a 13-inch length under the head, with partial threading per ASME B18.2.1 standards. Manufactured from Grade 8 steel with a bright, uncoated finish, this fastener delivers the elevated tensile and proof-load ratings required for demanding structural and mechanical applications. Licensed contractors, millwrights, and industrial maintenance technicians working with heavy equipment and structural connections will find this screw suited to applications where fastener grade is specified by engineering documentation.

This cap screw is sized for applications requiring a large-diameter, fine-thread fastener with significant clamping length. The partial thread configuration makes it appropriate for through-bolt assemblies where the shank must pass through a clearance hole before engaging the mating threads. It is commonly used in industrial machinery, heavy equipment frames, structural steel connections, and other assemblies where Grade 8 rated hardware is called out. At 4.96 pounds per unit, this screw is suited for high-load scenarios where lighter-grade fasteners would be inadequate.

Key Features

• Grade 8 steel construction meets elevated tensile, yield, and proof-load requirements for demanding structural use
• 1-1/4-12 UNF (Unified National Fine) thread for greater thread engagement strength compared to coarse pitch
• 13-inch length under head accommodates deep through-bolt and long-reach assemblies
• Partially threaded shank per ASME B18.2.1 for use in clearance-hole pass-through configurations
• Bright uncoated finish — suitable for dry or controlled environments; can be coated or plated by the installer as needed
• 1-7/8-inch hex key (wrench) size for use with standard heavy-hex tooling

Compatibility

Designed as a standard inch-series hex head cap screw conforming to ASME B18.2.1, compatible with any 1-1/4-12 UNF mating nut, tapped hole, or threaded insert specified to that standard.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or structural technician following the applicable torque specifications defined in the engineering documentation for the assembly. Power down and de-energize any connected equipment before disassembly or fastener replacement. Use a properly rated 1-7/8-inch hex wrench or impact socket and verify that the mating threads are clean and free of debris before installation. Do not substitute a lower-grade fastener where Grade 8 is specified by design.