Holo-krome 68028 Low Socket Cap Screw 1/4-20 X 3/4 in

Product Description

The HOLO-KROME 68028 is a low socket cap screw designed for applications where standard cap screw head height creates clearance problems. Built from alloy steel with a black oxide finish, it measures 1/4-20 thread size by 3/4 inches in length, measured under the head. The head height is 0.1270 inches, driven by a 1/8-inch hex socket key. It is fully threaded along its entire length. This fastener meets ASME B18.3 and ASTM A574 standards, making it suitable for structural and mechanical assemblies that require a certified, traceable fastener. Machinists, millwrights, and industrial maintenance technicians are the primary installers.

This screw is used where low-profile fastening is needed in tight axial clearance zones — common in fixture plates, machine tool components, guards, brackets, and enclosures. The coarse UNC thread pattern (1/4-20) suits general-purpose steel and alloy assemblies. The black oxide finish provides mild corrosion resistance and reduces light reflection in tool and die or precision machine environments. This part is sold in minimum order quantities of 100 pieces, making it appropriate for production, MRO stocking, or repeat service work.

Key Features

• Low socket cap head profile at 0.1270 inches — ideal for tight clearance installations
• Fully threaded 1/4-20 UNC coarse thread along entire 3/4-inch body length
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish for mild corrosion resistance and low-glare appearance
• 1/8-inch hex socket drive for precise torque application in confined spaces
• Compliant with ASME B18.3 dimensional standard

Compatibility

Designed as an OEM-style and replacement fastener for 1/4-20 UNC threaded applications requiring a low socket cap head profile per ASME B18.3.

Installation Notes

Installation requires a 1/8-inch hex key or hex socket bit. De-energize and lock out any equipment before fastener removal or installation in live machinery per applicable OSHA lockout/tagout procedures. Apply thread engagement of at least 1.0 times the nominal diameter in the mating material for full load-bearing capacity. Do not substitute a standard hex key size — using an undersized key risks rounding the socket drive.