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

Product Description

The VALUE COLLECTION -33721-7 is a partially threaded hex socket cap screw engineered for high-strength fastening applications in mechanical assemblies, structural connections, and industrial equipment. Sized at 1-1/4-7 UNC with a 7-inch length under head, this screw accepts a 7/8-inch hex drive and is manufactured from alloy steel with a black oxide coating for corrosion resistance and reduced surface reflectivity. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it a recognized choice where specification compliance is required. Machinists, maintenance technicians, and industrial assemblers install this fastener in demanding environments where high tensile strength and precise fitment are critical.

This hex socket cap screw is suited for heavy-duty mechanical and industrial applications where a recessed drive is preferred for flush or near-flush installation. Its partial threading allows for precise clamping force on thick workpieces or flanged joints. The large 1-1/4-7 UNC thread form and 7-inch body length make it appropriate for deep-reach bolting in equipment frames, machine bases, dies, fixtures, and fabricated steel assemblies.

Key Features

• 1-1/4-7 UNC thread size with 7 inches of length under head for deep-reach fastening
• Partially threaded shank for accurate clamping and load distribution across thick sections
• 7/8-inch hex socket drive for use with standard hex keys or socket drive tools
• Alloy steel construction for high tensile and shear strength
• Black oxide finish provides mild corrosion resistance and low-glare surface
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as a standard 1-1/4-7 UNC hex socket cap screw for use in industrial machinery, structural steel assemblies, and equipment requiring ASME/ANSI B18.3 and ASTM A574 compliant fasteners.

Installation Notes

Installation should be performed by qualified mechanical or maintenance technicians using a calibrated torque wrench and the correct 7/8-inch hex key or socket. De-energize and lock out all equipment before fastener installation or replacement per applicable OSHA lockout/tagout procedures. Do not exceed the torque specifications listed in the applicable engineering or equipment documentation for this thread size and grade. Inspect threads for damage before installation and ensure mating tapped holes meet UNC tolerance requirements.