Holo-krome 72104 Hex Socket Cap Screw 1/4-20 Unc Alloy Steel

Product Description

The HOLO-KROME 72104 is a hex socket cap screw designed for precision fastening in mechanical, industrial, and trade assembly applications. It features a 1/4-20 UNC thread and a 1-1/2 inch length under head, with partial threading along the shank. The drive is a 3/16 inch internal hex socket, requiring an Allen-style key or hex bit driver. Constructed from alloy steel with a black oxide finish, this fastener delivers strong clamping force and moderate corrosion resistance in dry and lightly oiled environments. It meets ASME B18.3 and ASTM A574 standards for dimensional and mechanical conformance.

This screw is suited for use in machinery, equipment frames, fixtures, and assemblies where a low-profile, high-strength socket-drive fastener is required. The partial threading allows for precise clamping and is appropriate for through-bolt and tapped-hole applications at 1/4-20 UNC thread pitch. Typical installers include millwrights, mechanical contractors, HVAC fabricators, and maintenance technicians working on equipment housings and component mounting.

Key Features

• 1/4-20 UNC thread size for standard fractional fastener compatibility
• 1-1/2 inch length under head for secure clamping depth
• 3/16 inch hex socket drive for use with Allen keys or hex bit drivers
• Partially threaded shank for precise clamping in tapped holes
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish provides mild corrosion resistance in dry or lightly oiled conditions

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw conforming to ASME B18.3, suitable for use in any application requiring a 1/4-20 tapped hole with a socket-drive fastener of equivalent dimensions.

Installation Notes

Installation requires a 3/16 inch hex key or Allen-style bit driver; use of an appropriately sized tool prevents drive rounding. Ensure the tapped receiving hole is clean and free of debris before threading. Apply thread lubricant where required by the assembly specification to achieve accurate torque. Minimum order quantity for this item is 100 pieces per order.