Value Collection 721550BR Flat Socket Cap Screw 1-8x8 in

Product Description

The VALUE COLLECTION 721550BR is a flat socket cap screw designed for applications requiring a flush or countersunk fastener profile. It features an 82-degree flat head driven by a 5/8-inch hex socket, and is manufactured from alloy steel with a black oxide finish for corrosion resistance in moderate environments. The screw measures 1-8 thread size by 8 inches in overall length and is partially threaded. It conforms to ASME/ANSI B18.3 and ASTM F835 standards. Machinists, millwrights, and maintenance technicians install this fastener in structural assemblies, machinery, and fabricated components where a low-profile head is required.

This flat socket cap screw is suited for use in general industrial, mechanical, and structural applications where UNC threading and a countersunk seating angle of 82 degrees are specified. The black oxide finish offers mild corrosion resistance and reduces light reflection, making it appropriate for both interior mechanical assemblies and light-duty outdoor applications. The partial threading allows for clamping force in joints where thread engagement is needed only at the receiving member, a common requirement in thicker material stacks.

Key Features

• 82-degree flat head profile for flush or countersunk installations
• 5/8-inch hex socket drive for reliable torque application with standard hex keys
• Alloy steel construction provides high tensile strength for demanding fastening applications
• Black oxide finish for mild corrosion resistance and reduced surface reflectivity
• Partially threaded shank for clamping force in thick-material assemblies
• Conforms to ASME/ANSI B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style and general-purpose replacement or specification fastener for assemblies requiring a 1-8 UNC flat socket cap screw with an 8-inch overall length and 82-degree head angle, per ASME/ANSI B18.3 and ASTM F835.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 5/8-inch hex key or socket driver. Ensure the mating countersink is machined to the correct 82-degree angle before installation to achieve full head seating. De-energize and lockout any equipment before fastener replacement or removal. Follow applicable industry torque guidelines for the fastener grade and application when tightening.