Value Collection 40225 Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION 40225 is a partially threaded hex socket cap screw designed for high-strength fastening applications requiring precise torque control. Sized at 1/4-28 UNF with a 2-1/2 inch length under head, it accepts a 3/16 inch hex drive. Constructed from alloy steel with a black oxide coating, this screw delivers solid mechanical performance and basic corrosion resistance in dry or lightly oiled environments. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it a recognized choice for mechanical assemblies across industrial and trade applications. Machinists, millwrights, and mechanical contractors commonly spec this fastener type.

This cap screw suits applications where a flush or recessed drive head is required, such as machine frames, jigs, fixtures, brackets, and equipment panels. The 1/4-28 UNF fine thread pitch provides stronger thread engagement and better resistance to loosening under vibration compared to coarse thread equivalents. Partial threading allows the unthreaded shank to act as a locating or shear element in close-tolerance assemblies. Sold individually with a minimum order quantity of 25 pieces.

Key Features

• 1/4-28 UNF fine thread for tight thread engagement and vibration resistance
• 2-1/2 inch length under head suits deeper fastening applications
• 3/16 inch hex socket drive for use with standard Allen keys or hex bit drivers
• Partially threaded shank for precision locating and shear load transfer
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide finish provides mild corrosion resistance and reduced glare

Compatibility

Designed as a standard 1/4-28 UNF hex socket cap screw conforming to ASME/ANSI B18.3, compatible with any tapped hole or threaded insert of matching thread specification.

Installation Notes

Install using a 3/16 inch hex key or socket bit driver. Ensure the mating tapped hole is clean, free of debris, and cut to 1/4-28 UNF specification before installation. Apply thread lubricant or thread-locking compound as required by the assembly specification. Do not exceed the rated torque for the fastener diameter and grade as defined by ASME standards.