Holo-krome 72098 Hex Socket Cap Screw 1/4-20 Unc Alloy Steel

Product Description

The HOLO-KROME 72098 is a hex socket cap screw designed for applications requiring a strong, low-profile fastener with a recessed drive. Sized at 1/4-20 UNC with a 7/8-inch length under the head, this screw is fully threaded and driven with a 3/16-inch hex key. It is machined from alloy steel and finished with a black oxide coating that provides moderate corrosion resistance and reduces light reflection. Trades using this fastener include mechanical contractors, millwrights, equipment assemblers, and industrial maintenance technicians working on machinery, fixtures, and structural assemblies.

This cap screw is suited for residential and commercial mechanical assemblies where a socket-drive fastener is required in tight clearance areas. The 1/4-20 UNC thread is a widely used coarse-thread standard, making this screw compatible with a broad range of tapped holes in steel, aluminum, and other materials. Full threading along the 7/8-inch shank provides maximum thread engagement for its size, which is useful in shallow or blind-hole installations common in HVAC equipment panels, electrical enclosures, and plumbing fixture brackets.

Key Features

• 1/4-20 UNC coarse thread with full threading along the 7/8-inch length under head
• 3/16-inch hex socket drive for use with standard Allen keys or hex bit drivers
• Alloy steel construction meets ASME B18.3 and ASTM A574 fastener standards
• Black oxide finish for moderate corrosion resistance and reduced surface reflectivity
• Low-profile socket head allows installation in recessed or clearance-limited locations

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw for use in any tapped hole meeting ASME B18.3 dimensional requirements. Suitable for steel, aluminum, and similar materials requiring a coarse-thread socket fastener.

Installation Notes

Installation requires a 3/16-inch hex key or Allen-style driver; use of an incorrect size driver can strip the socket. De-energize or lock out equipment before fastener removal or replacement in electrical or mechanical assemblies per OSHA lockout/tagout procedures. Do not exceed the rated torque range for 1/4-20 alloy steel cap screws as specified by ASME B18.3 guidelines. Inspect threads and seating surfaces for damage before re-torquing in critical structural joints.