Value Collection 307220BR Hex Socket Cap Screw 7/8-9 Unc

Product Description

The VALUE COLLECTION 307220BR is a hex socket cap screw engineered for high-strength fastening applications in mechanical assembly, structural, and industrial environments. This screw features a 7/8-9 UNC thread size with 6 inches of length under the head and is partially threaded for reliable load-bearing performance. The fastener is made from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and a clean, low-glare appearance. It is driven with a 9/16-inch hex socket and conforms to ASTM A574, the standard specification for high-strength socket head cap screws. Machinists, millwrights, and maintenance technicians are the typical installers of this fastener type.

This socket cap screw is suited for use in heavy equipment assembly, machine tool construction, die and mold work, and general industrial maintenance. The partial threading pattern makes it appropriate for applications where a grip length is needed above the threaded section, such as through-bolted assemblies or applications requiring alignment and clamping without full thread engagement throughout the shank. The black oxide finish is commonly selected for interior or controlled-environment applications where aesthetics and mild surface protection matter.

Key Features

• 7/8-9 UNC thread size for high-load fastening in coarse-thread applications
• 6-inch length under head with partial threading for grip-length control
• Alloy steel construction meets ASTM A574 high-strength socket screw standard
• Black oxide finish provides mild corrosion resistance and low-reflectance surface
• 9/16-inch hex drive socket for positive, cam-out-resistant torque application

Compatibility

Designed as a direct-fit replacement or standard-specification fastener for any application requiring a 7/8-9 UNC partially threaded hex socket cap screw conforming to ASTM A574.

Installation Notes

Installation should be performed by a qualified machinist, millwright, or maintenance technician using a calibrated torque wrench and the appropriate 9/16-inch hex key or socket bit. Ensure mating threads are clean and free of debris before installation. Do not exceed the torque specifications defined by the design engineer or equipment OEM for this thread size and material grade. Black oxide fasteners used in corrosive or outdoor environments may require additional anti-corrosion treatment at the installer's discretion.