Value Collection 451658BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451658BR is a heavy-duty hex head cap screw sized at 1-3/8-6 UNC thread by 9 inches under the head. Built from Grade 8 steel with a bright, uncoated finish, this fastener is designed for high-strength bolted connections in structural, industrial, and heavy equipment applications. The partially threaded shank provides a bearing surface in the grip zone, making it suitable for applications where shank-to-hole contact improves joint integrity. At 4.46 pounds, this is a substantial fastener intended for demanding load conditions. Installation requires a 2-1/16-inch hex key or corresponding wrench. It meets ASME B18.2.1 dimensional standards.

This cap screw is used in heavy fabrication, structural steel assembly, agricultural equipment, and industrial machinery where high clamping force and shear resistance are required. The 1-3/8-6 UNC thread profile and 9-inch length make it well suited for thick-section bolted joints. Typical installers include millwrights, ironworkers, maintenance technicians, and heavy equipment mechanics working in facilities or field environments.

Key Features

• Grade 8 steel construction for high tensile strength and fatigue resistance
• Partially threaded shank provides bearing surface in grip zone for improved joint performance
• 1-3/8-6 UNC thread — coarse pitch for reliable engagement in steel and heavy materials
• Bright, uncoated finish suitable for use with applied lubricants or thread compounds as specified by the application
• Meets ASME B18.2.1 dimensional standard for hex head cap screws
• 2-1/16-inch hex wrench drive for high-torque installation

Compatibility

Designed as a standard ASME B18.2.1 hex head cap screw in 1-3/8-6 UNC x 9 inches. Compatible with any application calling for a Grade 8, partially threaded, bright-finish hex cap screw in this thread size and length.

Installation Notes

Installation is performed by qualified mechanical tradespeople using a calibrated torque wrench and the appropriate 2-1/16-inch hex socket or open-end wrench. Always degrease or lubricate mating threads according to the joint specification before installation, as surface condition directly affects achieved clamp load. Follow applicable torque specifications from the equipment manufacturer or structural engineer — do not substitute Grade 5 or SAE Grade 2 hardware in Grade 8-designated applications. Verify hole clearance and grip length before assembly to ensure the partially threaded shank positions correctly within the joint.