Value Collection 451037BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451037BR is a Grade 8 steel hex head cap screw sized 1-1/4-7 UNC by 8 inches under the head. Partially threaded and left bright/uncoated, it meets ASME B18.2.1 dimensional standards. Grade 8 steel delivers high tensile and proof-load strength, making this fastener appropriate for heavy-duty bolted joints where standard Grade 5 hardware is insufficient. A 1-11/16-inch hex drive size accepts standard heavy hex sockets. This screw is sold individually and is well suited to structural, mechanical, and equipment-assembly applications where large-diameter, high-strength fasteners are required.

This cap screw is used in heavy mechanical assemblies, structural steel connections, agricultural equipment, industrial machinery, and general fabrication where a large-diameter, partially threaded fastener is needed. The partial thread configuration allows the unthreaded shank to bear shear loads across the joint interface while the threaded section engages a nut or tapped hole to clamp the assembly. Licensed tradespeople including millwrights, ironworkers, pipefitters, and mechanical contractors commonly install fasteners of this type during equipment erection and structural assembly work.

Key Features

• Grade 8 steel construction for high tensile strength in demanding bolted joints
• Partially threaded shank to carry shear loads across the grip length
• 1-1/4-7 UNC thread form conforms to ASME B18.2.1 dimensional standard
• Bright/uncoated finish maintains as-manufactured dimensions with no coating buildup
• 1-11/16-inch hex key size compatible with standard heavy hex impact sockets
• 8-inch length under head accommodates thick stack-ups and long grip lengths

Compatibility

Designed for use with 1-1/4-7 UNC hex nuts, heavy hex nuts, and tapped holes conforming to ASME B18.2.1 and UNC thread standards in structural and mechanical applications.

Installation Notes

Installation should be performed by a qualified tradesperson familiar with proper bolting procedures for high-strength fasteners. Confirm mating thread class and grip length before assembly, and inspect threads for damage before installation. Apply torque using a calibrated torque wrench or impact tool with an appropriate 1-11/16-inch heavy hex socket, following the applicable engineering specification or job-site torque table for Grade 8 hardware. Do not use lubricants or thread compounds unless the torque specification has been adjusted to account for the change in friction coefficient.