Value Collection 451716BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451716BR is a hex head cap screw sized at 1-3/8-12 UNF thread by 7 inches under the head, manufactured from Grade 8 steel with a bright, uncoated finish. Grade 8 steel delivers high tensile strength suited to heavy-duty bolted connections in demanding mechanical and structural applications. The screw is partially threaded, conforming to ASME B18.2.1 dimensional standards. It is driven with a 2-1/16-inch hex key or socket and is sold individually. This fastener is installed by millwrights, industrial mechanics, heavy equipment technicians, and other trade professionals working with large-diameter, high-strength bolted assemblies.

This cap screw is suited for use in heavy machinery, structural steel connections, agricultural equipment, and industrial fabrication where a 1-3/8-12 UNF fine-thread pattern is specified. The partial thread shank provides a precise bearing surface in close-tolerance holes, making it appropriate for joints that require controlled clamping without full thread engagement through the entire grip length. Applications typically include equipment frames, press assemblies, and other high-load mechanical connections where Grade 8 strength ratings are required by design or specification.

Key Features

• Grade 8 steel construction provides high tensile and proof-load strength for heavy-duty bolted joints
• 1-3/8-12 UNF thread form offers finer pitch than coarse-thread equivalents, improving thread engagement and vibration resistance
• Partially threaded shank supports precise load transfer across unthreaded grip sections
• Bright, uncoated finish suitable for applications where plating or coating is not required or is applied post-installation
• Conforms to ASME B18.2.1 dimensional standards for interchangeable fitment
• Driven with a 2-1/16-inch hex socket for standard impact or torque wrench installation

Compatibility

Designed as a direct-fit replacement or new-installation fastener wherever a 1-3/8-12 UNF, Grade 8, partially threaded hex head cap screw conforming to ASME B18.2.1 is specified.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with high-strength fastener torque requirements for the specific application and joint design. Always consult the equipment manufacturer's torque specification table before tightening; do not estimate torque on Grade 8 large-diameter fasteners. Ensure mating threads are clean and free of debris before assembly. Use of a calibrated torque wrench or torque multiplier is strongly recommended for fasteners in this size range.