Value Collection 451136BR Hex Head Cap Screw 5/8-18 X 9 in Grade 8

Product Description

The VALUE COLLECTION 451136BR is a partially threaded hex head cap screw designed for high-strength bolted assemblies in structural, mechanical, and industrial applications. Manufactured from Grade 8 steel with a bright uncoated finish, this fastener delivers the tensile strength required for demanding joint applications where standard fastener grades fall short. The 5/8-18 UNF thread form provides fine-pitch engagement suited to precision clamping and vibration-resistant connections. At 9 inches under the head, this is a long-body fastener appropriate for through-bolt applications in heavy fabrications or thick-stack assemblies. Installation is performed using a 5/16-inch hex key or standard hex drive tooling. It conforms to ASME B18.2.1 dimensional standards.

This fastener is used in general industrial maintenance, heavy equipment repair, structural steel fabrication, and OEM machine assembly where Grade 8 tensile ratings are specified. The fine 5/8-18 UNF thread makes it well suited for applications requiring controlled preload or where vibration could loosen a coarse-thread fastener. The partially threaded shank provides a grip length that resists shear loads at the joint interface, making it appropriate for bolted connections with significant lateral forces. It is sold individually and is compatible with 5/8-18 UNF hex nuts and washers.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 5/8-18 UNF fine-pitch thread for controlled clamping and vibration resistance
• Partially threaded shank provides shear-bearing grip length
• Bright uncoated finish — suitable for applications where coating clearances are not required
• Conforms to ASME B18.2.1 dimensional standard
• 9-inch under-head length for through-bolt and thick-stack assemblies

Compatibility

Designed for use with 5/8-18 UNF hex nuts, heavy hex nuts, and flat washers in standard inch-series fastener assemblies meeting ASME B18.2.1 specifications.

Installation Notes

Installation is typically performed by millwrights, ironworkers, or maintenance mechanics using standard hex drive or impact tooling. Always verify the mating nut and tapped hole are 5/8-18 UNF before installation to avoid cross-threading. Apply the appropriate torque value per the joint engineering specification or applicable torque table for Grade 8 fasteners — no torque value is provided with this part. For structural applications, consult applicable codes such as AISC or ASME standards to confirm fastener grade suitability.