Value Collection 721420BR Flat Socket Cap Screw 3/4-16

Product Description

The VALUE COLLECTION 721420BR is a flat socket cap screw designed for applications requiring a low-profile, flush-mount fastener. It features an 82-degree flat head with a 1/2-inch hex socket drive, accepting a standard hex key for installation and removal. The screw measures 3-1/2 inches in overall length and is partially threaded with a 3/4-16 UNF thread form. Manufactured from alloy steel with a black oxide finish, this fastener delivers solid mechanical strength and moderate corrosion resistance in interior or controlled-environment assemblies. Machinists, millwrights, and maintenance technicians working with structural or mechanical assemblies are the typical end users.

This flat socket cap screw suits applications where the fastener head must sit flush with or below the mating surface. Common uses include machine frames, jigs, fixtures, tooling plates, and mechanical assemblies where a protruding head would interfere with moving parts or mating components. The 3/4-16 UNF thread provides finer thread engagement compared to UNC, making it well suited for applications requiring precise clamping force or where vibration resistance is a consideration. Sold individually.

Key Features

• 82-degree flat head profile allows flush or countersunk installation
• 1/2-inch hex socket drive for precise torque application with standard hex keys
• 3/4-16 UNF thread for fine-pitch engagement and vibration resistance
• Partially threaded shank allows for clearance-hole applications
• Alloy steel construction provides high tensile strength
• Black oxide finish offers mild corrosion resistance and reduced light reflection

Compatibility

Designed as a standard inch-series flat socket cap screw conforming to ASME/ANSI B18.3 and ASTM F835, suitable for use in machine assemblies and structural applications requiring a 3/4-16 UNF countersunk fastener.

Installation Notes

Installation is performed using a 1/2-inch hex key or socket driver. Before installing, verify the mating countersink angle matches the 82-degree head geometry to ensure proper seating and load distribution. Apply appropriate thread lubricant or thread-locking compound per assembly specifications. Alloy steel fasteners are susceptible to corrosion in wet or outdoor environments; select a finish appropriate for the service conditions.