Value Collection 581416PR Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 581416PR is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, tooling fixtures, and precision equipment. It features a 1/4-28 UNF thread size with a 5-1/2 inch length under head and a 3/16 inch hex drive. The screw is partially threaded, which provides a smooth shank section for shear-load applications. Constructed from alloy steel with a black oxide finish, it meets ASME/ANSI B18.3 and ASTM A574 standards. This fastener is installed by machinists, millwrights, maintenance technicians, and mechanical contractors working in industrial and commercial settings.

This socket cap screw is suited for close-tolerance assemblies where a standard hex bolt head would interfere with surrounding components. The 1/4-28 UNF fine thread pitch provides greater thread engagement and improved resistance to loosening under vibration. The partially threaded design allows the smooth shank to bear lateral loads without thread stress concentration. Typical applications include machine frames, jigs, fixtures, and equipment panels requiring a recessed drive fastener.

Key Features

• 1/4-28 UNF fine thread for secure, vibration-resistant engagement
• 5-1/2 inch length under head with partial threading for shear-load capability
• 3/16 inch hex socket drive for use with standard Allen or hex key tools
• Alloy steel construction rated to ASTM A574 for high tensile strength
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as a standard ASME/ANSI B18.3 hex socket cap screw for use in any application requiring a 1/4-28 UNF partially threaded fastener with a 3/16 inch hex drive.

Installation Notes

Installation requires a 3/16 inch hex key or Allen driver; use a calibrated torque wrench where fastener preload is critical to the assembly. Ensure mating threads are clean and free of debris before installation. Do not exceed the rated torque for the alloy steel material grade to avoid fastener failure. Follow applicable mechanical codes and equipment manufacturer specifications for torque and thread engagement requirements.