Value Collection 99158 Hex Cap Screw 5/8-11 X 4.5 in Grade 8 25pk

Product Description

The VALUE COLLECTION 99158 is a Grade 8 steel hex head cap screw in a 5/8-11 thread size with a 4.5-inch length under the head. It features partial threading and an uncoated finish, making it suited for high-strength bolted assemblies where a bare metal surface is acceptable or required for subsequent coating. This fastener meets ASME B18.2.1 dimensional standards and uses a Unified National Coarse (UNC) thread form. Sold in a pack of 25, it is a practical quantity for contractors, maintenance technicians, and fabricators who regularly install or replace structural fasteners in mechanical, industrial, or construction applications.

This screw is used wherever a high-strength, partially threaded hex cap screw is required in inch-measurement assemblies. The Grade 8 rating indicates a minimum tensile strength suitable for demanding structural and mechanical connections. Typical applications include steel frame assemblies, equipment mounting, machinery repair, and general industrial fabrication. The uncoated finish means no additional coating thickness to account for in precision-fit holes, and the partial threading provides a smooth shank bearing surface under load.

Key Features

• Grade 8 steel construction for high-strength bolted connections
• 5/8-11 UNC thread size with 4.5-inch length under head
• Partially threaded shank provides smooth bearing surface in clearance holes
• Uncoated finish suitable for applications requiring bare metal or field-applied coatings
• Meets ASME B18.2.1 dimensional standards for hex head cap screws
• Sold in a pack of 25 for job-quantity use

Compatibility

Designed as a standard ASME B18.2.1 inch-series hex head cap screw for use in any application requiring a 5/8-11 UNC partially threaded fastener in Grade 8 steel.

Installation Notes

Installation should be performed by a qualified mechanic, ironworker, or maintenance technician following applicable torque specifications for Grade 8 fasteners in the relevant engineering or construction standard. Ensure mating threads are clean and free of debris before installation. A calibrated torque wrench should be used to achieve proper clamp load. Do not substitute a lower-grade fastener in a joint designed for Grade 8 hardware.