Holo-krome 64044 Button Socket Cap Screw 1/4-20 5/8in

Product Description

The HOLO-KROME 64044 is a button head socket cap screw with a 1/4-20 thread size and 5/8 inch length under head. It features a hex socket drive sized at 5/32 inch and is manufactured from alloy steel with a black oxide finish. Fully threaded with a right-hand UNRC thread form and a 3A fit class, this fastener meets ANSI/ASME B18.3 and ASTM F835 standards. The button head profile offers a low-profile, domed appearance with a 0.437 inch head diameter and 0.132 inch head height. A Rockwell hardness rating of 38 HRC ensures reliable strength in demanding mechanical assemblies. Installed by maintenance technicians, millwrights, and mechanical contractors.

This fastener is suited for general mechanical assemblies where a low-profile head is required to clear adjacent components or provide a flush-style appearance. Common applications include machine guards, brackets, enclosures, and equipment panels in industrial, commercial, and light manufacturing environments. The black oxide finish provides mild corrosion resistance and a uniform appearance. It is sold individually but requires a minimum order quantity of 100 pieces, making it appropriate for maintenance shops, MRO stocking, and production line use.

Key Features

• 1/4-20 UNC thread with 3A fit class for consistent thread engagement
• 5/8 inch length under head, fully threaded
• Low-profile button head at 0.437 inch diameter and 0.132 inch height
• 5/32 inch hex socket drive for standard L-key or socket bit installation
• Alloy steel construction rated at 38 HRC hardness
• Black oxide finish for mild corrosion and wear resistance
• Meets ANSI/ASME B18.3 and ASTM F835 fastener standards

Compatibility

Designed as an OEM-style and MRO replacement fastener for 1/4-20 UNC tapped holes requiring a button head socket cap screw per ANSI/ASME B18.3.

Installation Notes

Install using a 5/32 inch hex key or socket bit driver. Verify tapped hole thread class and depth before installation to ensure proper engagement. De-energize and lock out any equipment before performing fastener removal or replacement on live machinery. Torque to values specified by the equipment manufacturer or applicable ANSI standards for 1/4-20 alloy steel fasteners.