Value Collection 872149PR Hex Socket Cap Screw 1/4-20

Product Description

The VALUE COLLECTION 872149PR is an alloy steel hex socket cap screw designed for secure, high-strength fastening in mechanical assemblies, fixtures, and equipment. The screw features a 1/4-20 UNC thread and a 3/4-inch length under the head, with full threading along the entire shank. Drive engagement is achieved with a 3/16-inch hex key. The zinc-plated finish provides a base level of corrosion resistance for general indoor and light-duty applications. This fastener is manufactured to ASME B18.8 and ASTM A574 standards, making it appropriate for controlled mechanical and structural connections where torque and load requirements demand a socket-head design.

This cap screw is suited for use in light industrial equipment, machine frames, tooling fixtures, and general mechanical assemblies where a recessed hex drive is preferred. The 1/4-20 UNC thread is one of the most common fastener threads in North American trade applications, making this screw a standard fit for machine shops, fabrication facilities, and maintenance operations. Full threading ensures maximum thread engagement across the full shank length, which is beneficial in thin-material or blind-hole installations.

Key Features

• 1/4-20 UNC thread for compatibility with standard tapped holes
• 3/4-inch length under head with full threading along the entire shank
• 3/16-inch hex socket drive for use with standard Allen wrenches or hex keys
• Alloy steel construction meets ASTM A574 for high tensile strength
• Zinc-plated finish provides basic corrosion protection for general-use environments
• Conforms to ASME B18.8 dimensional standards

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw for use in any application requiring an ASME B18.8 or ASTM A574 compliant fastener with a 3/16-inch hex drive.

Installation Notes

Installation is performed with a 3/16-inch hex key or Allen wrench; use a torque wrench rated for small fasteners when torque specifications are required by the assembly drawing. Ensure the mating tapped hole is clean, properly tapped to 1/4-20 UNC, and free of debris before driving the screw. Do not exceed the rated tensile strength of the fastener by over-torquing, as alloy steel socket cap screws are susceptible to shear failure under excessive load. Follow applicable ASME or equipment-specific fastener torque tables for final torque values.