Value Collection 451187BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451187BR is a Grade 8 steel hex head cap screw designed for heavy-duty fastening applications in industrial, mechanical, and structural assemblies. Measuring 1-8 thread size with a 9-inch length under head, this fastener features partial threading and conforms to ASME B18.2.1 dimensional standards. The bright, uncoated finish leaves the steel surface bare, making it suitable for applications where a specific coating will be applied after installation or where coating is not required. This screw is sized for installation with a 1/2-inch hex key or wrench and follows the Unified National Coarse (UNC) thread standard.

This cap screw is used in applications requiring a high-strength fastener capable of handling significant clamping loads. Grade 8 classification makes it appropriate for heavy equipment assembly, machinery frames, structural connections, and similar demanding mechanical installations. The partial threading is suited for through-bolt applications where an unthreaded shank provides a bearing surface in the grip area. Machinists, millwrights, maintenance technicians, and mechanical contractors are the primary installers of fasteners in this class.

Key Features

• Grade 8 steel construction for high tensile and proof strength requirements
• 1-8 UNC thread form for compatibility with standard coarse-thread nuts and tapped holes
• Partially threaded shank provides a solid bearing surface in the grip zone
• Conforms to ASME B18.2.1 for dimensional consistency and interchangeability
• Bright, uncoated finish suitable for secondary coating or bare-steel applications
• 1/2-inch hex key size for installation with standard hex wrenches or sockets

Compatibility

Designed as a standard UNC coarse-thread hex head cap screw conforming to ASME B18.2.1, suitable for use with Grade 8-rated nuts and hardware in inch-measurement fastener assemblies.

Installation Notes

Installation of Grade 8 hex head cap screws should be performed by a qualified mechanic or maintenance technician using calibrated torque equipment to achieve the required clamping load for the joint specification. De-energize and lock out all equipment before performing fastener work on live machinery. Apply thread lubricant or anti-seize only when specified by the joint design, as dry torque values differ from lubricated values. Verify that mating threads and bearing surfaces are clean and free of debris before assembly.