Value Collection 872173PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 872173PR is a hex socket cap screw designed for applications requiring a precise, low-profile fastening solution. Featuring a 1/4-28 UNF thread size and a 1/2-inch length under head, this screw is fully threaded from the bearing surface to the tip. The 3/16-inch hex drive accepts a standard Allen key or hex bit driver. Constructed from alloy steel with a zinc-plated finish, the 872173PR provides solid mechanical strength with basic corrosion resistance. It is commonly installed by machinists, maintenance technicians, and mechanical contractors in equipment assembly, jig and fixture work, and general industrial fastening tasks.

This screw is suited for fine-thread fastening applications in ferrous and non-ferrous assemblies where a recessed drive head is required to clear adjacent components or flush-mount into a counterbored hole. The 1/4-28 UNF fine thread pitch provides greater thread engagement and improved resistance to loosening under vibration compared to coarse-thread variants of the same diameter. Typical use cases include machine tool assemblies, bracket mounting, and precision mechanical equipment. This part is sold individually with a minimum order quantity of 100 pieces.

Key Features

• 1/4-28 UNF fine thread for high thread engagement and vibration resistance
• Fully threaded body maximizes fastening contact over the entire 1/2-inch length under head
• 3/16-inch hex socket drive compatible with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASME B18.8 and ASTM A574 standards
• Zinc-plated finish provides basic corrosion protection for general indoor and sheltered environments

Compatibility

Designed as a standard ASME B18.8 and ASTM A574 compliant hex socket cap screw suitable for general industrial, mechanical, and equipment assembly applications requiring a 1/4-28 UNF thread.

Installation Notes

Installation requires a 3/16-inch hex key or Allen driver. Always ensure the mating threaded hole is clean and free of debris before installation. Torque to the value specified by the equipment manufacturer or applicable engineering standard for the fastener grade and material being joined. Do not exceed the rated capacity of the mating material, particularly when threading into aluminum or soft alloys.