Value Collection -40218-1 Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION -40218-1 is a hex socket cap screw designed for precision fastening applications requiring a compact drive profile. Sized at 1/4-28 UNF with a 7/8 inch length under head, this fastener is fully threaded and driven with a 3/16 inch hex key. Constructed from alloy steel with a black oxide coating, it provides a combination of high tensile strength and moderate corrosion resistance. This screw meets ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for applications where dimensional and mechanical consistency are required. Machinists, millwrights, and maintenance technicians regularly specify this fastener type in precision assemblies.

This screw is used in mechanical, industrial, and equipment maintenance applications where a low-profile socket drive fastener is needed. The fine 1/4-28 UNF thread pitch is suited for applications requiring increased thread engagement and vibration resistance compared to coarse-thread alternatives. Common install scenarios include machinery panels, fixtures, jigs, and equipment housings where clearance is limited and a flush or recessed head is preferred.

Key Features

• 1/4-28 UNF fine thread for increased vibration resistance and thread engagement
• Fully threaded 7/8 inch length under head for maximum fastening flexibility
• 3/16 inch hex socket drive for use with standard hex keys or Allen wrenches
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• 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 suitable for use in any application calling for a 1/4-28 UNF fully threaded socket head cap screw with a 7/8 inch length under head.

Installation Notes

Install using a 3/16 inch hex key or socket drive bit; ensure the key is fully seated to avoid rounding the drive recess. De-energize and lock out any equipment before replacing fasteners on live machinery per applicable safety procedures. Do not mix UNF and UNC threaded hardware in the same assembly. Hand-thread before applying torque to prevent cross-threading in tapped holes.