Value Collection -33721-6 Hex Socket Cap Screw 1-1/4-7 Unc

Product Description

The VALUE COLLECTION -33721-6 is a hex socket cap screw designed for heavy-duty fastening applications where high tensile strength and precise torque control are required. It features a 1-1/4-7 UNC thread size with partial threading and a 6-inch length under head. The 7/8-inch hex drive accepts a standard hex key or Allen-type driver. Manufactured from alloy steel with a black oxide coating, this fastener resists corrosion and reduces surface reflectivity. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for structural and mechanical assemblies where certified fasteners are specified.

This cap screw is suited for industrial, mechanical, and structural applications requiring a large-diameter, coarse-thread fastener. Typical use cases include heavy equipment assembly, machinery frames, fixture construction, and similar applications where a socket-drive fastener is preferred over hex-head styles for recessed or torque-critical installations. The partial threading is standard for longer fasteners in this size range, providing a grip length appropriate for through-bolt or tapped-hole configurations.

Key Features

• 1-1/4-7 UNC coarse thread for use in tapped holes or with compatible nuts
• 6-inch length under head with partial threading for proper grip-length engagement
• 7/8-inch hex socket drive for use with standard hex keys or drive tools
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides mild corrosion resistance and a non-reflective surface
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw compatible with 1-1/4-7 UNC tapped holes and matching hex nuts in industrial and mechanical assemblies.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using a properly sized 7/8-inch hex key or socket drive tool. Ensure the mating tapped hole or nut meets the same thread specification before installation. De-energize and lock out any equipment before fastener service on live machinery. Follow applicable industry torque specifications for 1-1/4-7 UNC alloy steel fasteners as published in engineering references or equipment OEM documentation.