Value Collection 451872BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451872BR is a heavy-duty hex head cap screw designed for high-strength bolted assemblies in industrial, structural, and mechanical applications. This fastener features a 2-4-1/2 inch UNC thread size, an 8-inch length under head, and is manufactured from Grade 8 steel in a bright, uncoated finish. Partial threading provides a smooth shank section for precise shear-load applications and clean bearing surfaces. Compliance with ASME B18.2.1 ensures dimensional consistency for use in engineered connections. Machinists, millwrights, ironworkers, and maintenance mechanics commonly spec this size for heavy equipment assembly and structural bolting.

This cap screw is suited for heavy industrial and structural applications where high tensile strength and dimensional accuracy are required. The UNC thread form is the standard coarse-thread series used across North American manufacturing and maintenance environments. The partial-thread configuration makes it well-suited for through-bolt applications with controlled clamping length. It is applicable in machine bases, press frames, structural steel connections, and large equipment mounting situations where Grade 8 strength is specified.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 2-4-1/2 UNC thread size in the standard coarse-thread series
• 8-inch length under head for deep through-bolt applications
• Partially threaded shank for shear load and bearing surface control
• Bright, uncoated finish — suitable for environments where plating is not required
• Meets ASME B18.2.1 dimensional standards for engineered assemblies

Compatibility

Designed as a standard hex head cap screw per ASME B18.2.1, compatible with 2-4-1/2 UNC threaded holes and corresponding heavy hex or standard hex nuts in Grade 8 or higher rated assemblies.

Installation Notes

Installation of large-diameter structural fasteners of this type is typically performed by millwrights, ironworkers, or qualified maintenance mechanics. Always de-energize and lock out equipment before disassembling or reassembling structural bolted connections. Use calibrated torque equipment appropriate for the joint specification; consult the applicable engineering drawing or structural specification for required preload values. Follow ASME, AISC, or applicable structural codes for tightening method and inspection requirements.