Value Collection 581021PR Hex Socket Cap Screw 1-64 Unc

Product Description

The VALUE COLLECTION 581021PR is a hex socket cap screw designed for precision fastening in tight-clearance applications. Manufactured from alloy steel with a black oxide coating, this screw measures 3/8 inches under the head and is fully threaded on a 1-64 UNC thread form. The 5/64 inch hex drive accepts a standard Allen key or hex bit driver. Black oxide finish provides mild corrosion resistance and reduces light reflection, making it a practical choice for mechanical assemblies, instrument work, and small-frame fabrication where controlled torque and thread engagement matter. Sold in minimum order quantities of 100.

This fastener is suited for light-duty mechanical and electromechanical assemblies requiring small-diameter, fine-pitch threading. Common applications include instrument panels, electronics enclosures, fixture jigs, and precision machine components where space constraints rule out larger fastener profiles. Licensed mechanics, machine builders, and assembly technicians are the typical installers. The 1-64 UNC thread designation is the coarsest standard thread available at the No. 1 diameter, offering reliable engagement in thin or tapped metal stock.

Key Features

• Fully threaded 1-64 UNC for maximum thread engagement in short-grip applications
• Alloy steel construction for strength in small-diameter fastener applications
• Black oxide coating provides mild corrosion resistance and matte appearance
• 5/64 inch internal hex drive compatible with standard Allen keys and hex bit sets
• Conforms to ASME/ANSI B18.3 and ASTM A574 standards
• 3/8 inch length under head suits thin-stack and shallow-boss installations

Compatibility

Designed as a standard replacement or stock fastener for any application requiring a 1-64 UNC fully threaded hex socket cap screw with a 3/8 inch length under head.

Installation Notes

Installation requires a 5/64 inch hex key or matching hex bit driver. Always verify that the tapped hole thread form and class of fit match the 1-64 UNC specification before driving the fastener. Do not overtighten small-diameter alloy steel screws, as thread stripping in soft mating materials is a common failure mode. Follow applicable machine design standards and torque guidelines from the fastener standard for the specific joint material and application.