Value Collection 721277BR Flat Socket Cap Screw 5/8-18

Product Description

The VALUE COLLECTION 721277BR is a flat socket cap screw designed for flush or countersunk fastening applications in mechanical assemblies. It features an 82-degree flat head profile and a 3/8-inch hex socket drive, requiring an Allen wrench for installation. The fastener is fully threaded with a 5/8-18 UNF thread form and measures 1-3/4 inches in overall length. Constructed from alloy steel with a black oxide finish, it provides a balance of tensile strength and moderate corrosion resistance suitable for indoor and controlled-environment use. This screw meets ASME/ANSI B18.3 and ASTM F835 standards. Machinists, millwrights, and mechanical contractors install this type of fastener in equipment frames, fixtures, and structural assemblies.

The 721277BR is suited for applications where the fastener head must sit flush or below the surface of the mating material. Its UNF thread pitch offers finer thread engagement compared to UNC, making it a common choice in precision assemblies, tooling fixtures, and machinery where vibration resistance or tight tolerances are a factor. The black oxide finish blends into steel components and reduces light reflection in environments where that matters. This screw is sold individually and is appropriate for low-quantity repair and replacement work as well as engineered builds.

Key Features

• 82-degree flat head seats flush or countersunk in mating surfaces
• 3/8-inch hex socket drive for Allen wrench or hex bit installation
• 5/8-18 UNF fully threaded shank for maximum thread engagement
• Alloy steel construction meets ASTM F835 and ASME/ANSI B18.3 standards
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Overall length measured end to end at 1-3/4 inches

Compatibility

Designed as an OEM-style or general-purpose replacement flat socket cap screw for any application requiring a 5/8-18 UNF fully threaded fastener with an 82-degree flat head and 3/8-inch hex socket drive.

Installation Notes

Install using a calibrated torque wrench and an appropriately sized 3/8-inch hex key or socket bit. Ensure the mating hole is properly countersunk to 82 degrees before installation to achieve full head seating. De-energize and lock out any equipment before fastener removal or replacement in live assemblies. Black oxide finish is not a substitute for corrosion-resistant coatings in wet or outdoor environments; apply a compatible thread lubricant or sealant if the service environment requires it.