Value Collection 451821BR Hex Head Cap Screw Grade 8

Product Description

The VALUE COLLECTION 451821BR is a heavy-duty hex head cap screw designed for high-strength fastening applications in structural, mechanical, and industrial assemblies. Sized at 1-3/4-5 thread with a 6-inch length under the head, this fastener is manufactured from Grade 8 steel with a bright uncoated finish. The partial threading conforms to ASME B18.2.1 standards, making it suitable for load-bearing bolted connections where a defined grip length is required. At 6.2 pounds, this is a substantial fastener intended for demanding service environments. Machinists, millwrights, and maintenance technicians typically install this class of hardware.

This screw is used in heavy industrial machinery, structural steel connections, and equipment fabrication where UNC thread and Grade 8 strength are specified. The partially threaded shank provides a bearing surface for precision alignment in bolted joints. Applications include manufacturing plant equipment, large-frame assembly, and heavy mechanical systems requiring fasteners rated to Grade 8 tensile standards. It is sold individually, making it practical for repair and replacement work where a single fastener is needed to complete a job.

Key Features

• Grade 8 steel construction for high tensile and proof load requirements
• Partially threaded shank conforms to ASME B18.2.1 for standardized fitment
• 1-3/4-5 UNC thread size for use with standard inch-series nuts and tapped holes
• 6-inch length under head provides extended grip for thick-section assemblies
• Bright uncoated finish suitable for use where additional coatings are not specified
• Hex key drive size of 2-5/8 inches for use with appropriately sized wrenches

Compatibility

Designed as a standard inch-series hex head cap screw for use with 1-3/4-5 UNC tapped holes or compatible heavy hex nuts in structural and industrial bolted assemblies.

Installation Notes

Installation should be performed by qualified millwrights, ironworkers, or maintenance technicians familiar with high-strength fastener procedures. Verify that mating threads and bearing surfaces are clean and free of debris before assembly. Use a properly sized wrench matched to the 2-5/8-inch hex drive to avoid rounding. Follow applicable engineering specifications or relevant codes for torque requirements, as no torque value is provided with this part listing.