Value Collection 99165 Hex Head Cap Screw 5/8-11 X 8 in Grade 8

Product Description

The VALUE COLLECTION 99165 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Manufactured from Grade 8 steel with an uncoated finish, this fastener delivers the tensile strength required for demanding bolted joints. The 5/8-11 thread size follows the Unified National Coarse (UNC) standard, and the 8-inch length under head accommodates thick-stack assemblies and through-bolt configurations. Compliance with ASME B18.2.1 confirms dimensional accuracy and interchangeability with standard hardware. Machinists, millwrights, pipefitters, and maintenance technicians working on heavy equipment, structural frames, or industrial machinery will find this screw suited to their requirements.

This cap screw is used in applications where high clamping force and resistance to shear or vibration loads are critical. The partial threading allows the unthreaded shank to bear shear loads cleanly while the threaded section provides positive engagement with a nut or tapped hole. Typical installations include equipment mounting, flange bolting, structural steel connections, and heavy-duty mechanical assemblies. The UNC thread form is widely compatible with standard hex nuts, flanged nuts, and threaded inserts used across industrial maintenance and construction trades. Packaged in a quantity of 10 per unit.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 5/8-11 UNC thread form for broad compatibility with standard fastener hardware
• Partially threaded shank handles shear loads without thread engagement in the grip zone
• 8-inch length under head suits deep through-bolt and thick-stack configurations
• Uncoated finish — suitable for use as-is or for post-installation coating or plating
• Meets ASME B18.2.1 dimensional standard for hex cap screws

Compatibility

Designed as a standard ASME B18.2.1 hex head cap screw compatible with 5/8-11 UNC hex nuts, lock nuts, and tapped holes in industrial and structural applications.

Installation Notes

Installation should be performed by qualified maintenance technicians, millwrights, or structural mechanics familiar with proper fastener torque procedures for Grade 8 hardware. Always use a calibrated torque wrench and consult the applicable equipment service manual or structural specification for the correct torque value — do not guess torque based on fastener size alone. Ensure mating threads are clean and free of debris before assembly. De-energize and lock out all equipment per OSHA lockout/tagout procedures before performing any bolted assembly work on live machinery.