Value Collection 451590BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451590BR is a heavy-duty hex head cap screw engineered for high-strength bolted connections in industrial, structural, and mechanical applications. It measures 1-1/4-7 UNC thread by 16 inches under the head and is manufactured from Grade 8 steel with a bright uncoated finish. The partial threading design concentrates clamping load through the shank, making it well suited for joints where shear strength and precise grip length matter. Weighing 5.97 pounds, this is a substantial fastener intended for demanding load-bearing assemblies. It conforms to ASME B18.2.1 dimensional standards, ensuring consistent fit in standard hex-pattern tooling and hardware.

This cap screw is used in heavy equipment fabrication, structural steel connections, machinery mounting, and similar applications where Grade 8 tensile strength is required. The 1-1/4-7 UNC coarse thread pattern provides reliable engagement in tapped steel and cast components across a wide range of industrial settings. The bright uncoated surface is appropriate for indoor or protected environments; field coating or plating may be applied as the installation requires. Licensed millwrights, ironworkers, and maintenance mechanics typically specify this size for large-diameter bolted joint assemblies.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1-1/4-7 UNC coarse thread, 16 inches under head for long-reach clamping
• Partially threaded shank preserves shear capacity through the grip zone
• Bright uncoated finish meets ASME B18.2.1 dimensional standards
• 1-7/8 inch hex key size compatible with standard heavy industrial wrenching tools
• Weighs 5.97 pounds — suitable for single-fastener structural joints

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for 1-1/4-7 UNC tapped holes in structural steel, heavy equipment frames, and industrial machinery requiring ASME B18.2.1 compliant Grade 8 hex head cap screws.

Installation Notes

Installation of large-diameter Grade 8 fasteners should be performed by a qualified mechanic, millwright, or ironworker using calibrated torque tooling appropriate for the joint specification. Always degrease or inspect the mating threaded bore before installation to prevent cross-threading in large-diameter UNC applications. Lubrication, thread-locking compound, or hardened washers should be applied only per the applicable engineering or equipment specification. Follow applicable ASME or structural codes for bolt tightening methods such as turn-of-nut or direct tension indicator procedures.