Value Collection D39201 Hex Head Cap Screw 7/8-9 X 4 in

Product Description

The VALUE COLLECTION D39201 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 7/8-9 UNC thread size and measures 4 inches under the head, making it well suited for through-bolt and heavy-duty clamping applications. Manufactured from Grade 8 steel and finished with a zinc yellow dichromate coating, this screw delivers elevated tensile strength combined with corrosion resistance. It conforms to ASME B18.2.1 and SAE J429 standards. Machinists, millwrights, and maintenance technicians working in industrial settings will find this fastener a reliable stock item for demanding joint applications.

This cap screw is appropriate for use in heavy equipment assembly, structural steel connections, machine frames, and general industrial maintenance where Grade 8 tensile ratings are specified. Partial threading allows the unthreaded shank to bear shear loads in bolted joints, which is a common requirement in mechanical power transmission and precision-aligned structural connections. It is sold individually with a minimum order quantity of 10 units.

Key Features

• Grade 8 steel construction provides high tensile and proof load strength for demanding fastening applications
• Zinc yellow dichromate finish offers corrosion resistance in moderate-exposure environments
• Partially threaded shank accommodates shear-load-bearing bolted joints
• 7/8-9 UNC thread form with 4-inch length under head suits common heavy-duty bolt patterns
• Conforms to ASME B18.2.1 and SAE J429 dimensional and material standards

Compatibility

Designed as a standard UNC hex head cap screw for use in any application specifying a 7/8-9 x 4 inch Grade 8 partially threaded fastener per ASME B18.2.1 and SAE J429.

Installation Notes

Installation should be performed by qualified mechanics or millwrights following applicable engineering torque specifications for Grade 8 fasteners at this thread size. Ensure mating threads are clean, free of debris, and properly lubricated or dry per joint design requirements before installation. Always use a calibrated torque wrench and confirm thread engagement meets minimum specification before applying final torque. Inspect the zinc dichromate finish for damage prior to installation in corrosive environments.