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

Product Description

The Value Collection 40218 is a hex socket cap screw designed for secure, high-strength fastening in mechanical assemblies, tooling fixtures, and equipment maintenance applications. It features a 1/4-28 UNF thread size with a 3/4 inch length under the head and is fully threaded from end to head. The 3/16 inch hex drive accepts a standard Allen key or hex bit. Constructed from alloy steel with a black oxide finish, this screw offers solid tensile strength and moderate corrosion resistance in protected or lightly oiled environments. It meets ASME/ANSI B18.3 and ASTM A574 fastener standards.

This screw is suited for general industrial, mechanical, and maintenance applications where a compact, low-profile socket head fastener is required. The fine 1/4-28 UNF thread provides better thread engagement and vibration resistance compared to coarse-thread equivalents, making it a common choice in precision assemblies, machine frames, and equipment enclosures. Installation is straightforward using a 3/16 inch hex key or hex bit driver. This item is sold individually but carries a minimum order quantity of 50 units.

Key Features

• 1/4-28 UNF fine thread for strong thread engagement and vibration resistance
• Fully threaded along the entire 3/4 inch length under head
• 3/16 inch hex drive compatible with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides a low-reflectance surface and mild corrosion protection in oiled or indoor environments
• Conforms to ASME/ANSI B18.3 socket cap screw dimensional standards

Compatibility

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

Installation Notes

Install and remove using a 3/16 inch hex key or hex bit; do not substitute an undersized or worn driver, as this can round the socket. Ensure the mating tapped hole is clean, free of debris, and correctly sized for 1/4-28 UNF thread before installation. Apply a thread lubricant or anti-seize compound where required by the application to prevent galling on alloy steel fasteners. Torque to the value specified by the equipment manufacturer or applicable engineering standard.