Value Collection 451570BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451570BR is a heavy-duty hex head cap screw engineered for high-stress bolted joint applications. It features a 1-1/4-7 UNC thread and a 14-inch length under head, with partial threading along the shank. Manufactured from Grade 8 steel with a bright uncoated finish, this fastener meets ASME B18.2.1 dimensional standards. The Grade 8 rating indicates a high-tensile-strength fastener suitable for demanding structural and mechanical assemblies. A 1-7/8-inch hex key size is required for installation or removal. This screw is sold individually and suited for use by millwrights, maintenance technicians, and mechanical contractors working on heavy equipment, structural steel, or industrial machinery.

This cap screw is appropriate for use in industrial, commercial, and heavy-duty mechanical applications where high clamp load and shank strength are required. Partially threaded shanks are common in applications where the unthreaded shank must bear shear loads or locate mating components precisely. Typical installation scenarios include structural bolting, equipment mounting, and heavy machinery assembly where UNC thread engagement and Grade 8 tensile strength are specified by engineering drawings or maintenance standards.

Key Features

• Grade 8 steel construction for high tensile strength in demanding bolted joint applications
• 1-1/4-7 UNC thread form per ASME B18.2.1 dimensional standard
• 14-inch length under head accommodates thick structural or mechanical assemblies
• Partial threading preserves an unthreaded shank for shear load bearing and precise location
• Bright uncoated finish — no coating thickness to account for in critical tolerance fits
• 1-7/8-inch hex drive compatible with standard hex wrenches and impact sockets

Compatibility

Designed for use in bolted assemblies requiring 1-1/4-7 UNC threads and Grade 8 tensile strength per ASME B18.2.1. Mates with standard 1-1/4-7 UNC hex nuts, heavy hex nuts, and threaded plates.

Installation Notes

Installation should be performed by qualified millwrights, maintenance mechanics, or structural assembly technicians familiar with high-strength fastener torque requirements. Always use a calibrated torque wrench and follow the torque specifications provided in the applicable engineering or equipment documentation — do not estimate torque on Grade 8 fasteners. Inspect the mating threads and bearing surfaces for damage or contamination before assembly. Ensure the joint is de-energized or de-pressurized, as applicable, before disassembling any structural or pressure-bearing connection.