Value Collection R40694128 Hex Socket Cap Screw 1/4-28 Unf

Product Description

The VALUE COLLECTION R40694128 is a hex socket cap screw designed for precision fastening applications requiring a fine-thread profile and high corrosion resistance. Threaded to the 1/4-28 UNF standard, this screw features a 1-1/4 inch length under head and accepts a 3/16 inch hex drive key. Constructed from 18-8 stainless steel, it provides reliable resistance to rust and oxidation in both indoor and outdoor environments. Licensed trades and maintenance professionals use this fastener where a flush, recessed-drive connection is required and where standard coarse-thread fasteners are not suitable.

This screw is suited for use in mechanical assemblies, equipment enclosures, fluid system components, and structural fixtures where the 1/4-28 UNF fine thread pitch is specified. The fine thread profile delivers higher clamping force per turn compared to coarse-thread equivalents and is commonly called out in aerospace-adjacent, HVAC, plumbing, and electrical panel applications. It is typically installed by maintenance technicians, millwrights, or journeyman-level tradespeople working to engineered fastener specifications.

Key Features

• 1/4-28 UNF fine thread for precise clamping and reduced axial play
• 1-1/4 inch length under head suits moderate-depth fastening requirements
• 3/16 inch hex socket drive for use with standard Allen keys or hex bit drivers
• 18-8 stainless steel construction resists corrosion and oxidation
• Low-profile socket cap head allows installation in recessed or counter-bored holes

Compatibility

Designed as a standard 1/4-28 UNF hex socket cap screw for use in any threaded bore or nut conforming to the 1/4-28 UNF thread standard.

Installation Notes

Install using a calibrated 3/16 inch hex key or socket hex bit driver. Ensure the mating threaded hole or nut is clean and free of debris before driving. Do not over-torque stainless steel fasteners, as galling can occur without proper anti-seize compound applied to the threads. Verify thread engagement depth meets the engineered specification for the assembly before applying final torque.