Value Collection 63521 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 63521 is a hex socket cap screw designed for secure, recessed-drive fastening in mechanical, structural, and industrial assemblies. Threaded to 1/4-20 UNC with a 1-1/2 inch length under head, it accepts a 3/16 inch hex drive for precise torque application in tight spaces. Manufactured from 316 stainless steel, it offers strong resistance to corrosion, chemical exposure, and elevated moisture environments. This fastener is suited for installation by millwrights, pipefitters, maintenance mechanics, and other trades requiring a reliable, corrosion-resistant socket cap screw in standard inch sizing.

This screw is appropriate for use in residential, commercial, and light industrial applications where a flush or low-profile head is required and a hex key or Allen driver is the preferred tool. The 1/4-20 UNC thread form is one of the most common unified coarse thread standards, making this fastener a straightforward fit in a wide range of tapped holes and threaded inserts. The 316 stainless steel grade provides added resistance to chlorides, making it a practical choice in coastal, marine-adjacent, or chemical-process environments.

Key Features

• 1/4-20 UNC thread for compatibility with standard unified coarse tapped holes
• 1-1/2 inch length under head for adequate thread engagement in typical assemblies
• 3/16 inch hex socket drive for use with standard Allen keys or hex bit drivers
• 316 stainless steel construction for corrosion and chemical resistance
• Low-profile socket cap head allows installation in recessed or close-clearance locations

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw suitable for use in any application requiring a unified coarse thread fastener of this diameter, drive type, and material grade.

Installation Notes

Install using a 3/16 inch hex key or Allen-style bit driver. Ensure the mating tapped hole is clean and free of debris before threading to avoid cross-threading or galling, which can be more common with stainless steel fasteners. Apply an appropriate anti-seize compound when assembling stainless steel into stainless steel threads to reduce the risk of galling. Follow applicable mechanical or structural codes for torque and fastener specifications relevant to the assembly.