Holo-krome 72020 Hex Socket Cap Screw 4-40 Unc Alloy Steel

Product Description

The HOLO-KROME 72020 is a hex socket cap screw designed for precision fastening in mechanical assemblies, equipment repairs, and industrial applications. It features a 4-40 UNC thread and a 3/32-inch hex drive, accepting a standard hex key or Allen wrench. The screw is fully threaded along its 3/8-inch length under the head. Constructed from alloy steel with a black oxide finish, it delivers reliable clamping force in tight spaces where a conventional hex head fastener will not fit. Licensed trade mechanics, millwrights, and equipment technicians commonly install this type of fastener during maintenance and assembly work.

This screw is suited for light-duty mechanical assemblies requiring a compact, recessed-drive fastener. The 4-40 UNC thread is a fine-pitch unified coarse thread standard common in small instrument panels, electrical enclosures, motor mounts, and precision equipment frames. The black oxide coating provides mild corrosion resistance and reduces surface glare. It is sold individually but must be ordered in multiples of 100 units per the manufacturer minimum order quantity.

Key Features

• 4-40 UNC thread for use in standard tapped holes in small mechanical and electrical assemblies
• 3/32-inch hex drive accepts a standard hex key for installation in recessed or confined spaces
• Fully threaded 3/8-inch length under head maximizes thread engagement across the full shank
• Alloy steel construction meets ASME B18.3 and ASTM A574 fastener standards
• Black oxide finish provides mild corrosion resistance and a low-reflectance appearance

Compatibility

Designed as an OEM-style replacement or stock fastener for any application requiring a 4-40 UNC fully threaded hex socket cap screw with a 3/8-inch length under head.

Installation Notes

Installation requires a 3/32-inch hex key or ball-end driver. De-energize and lock out any equipment before fastener work on electrical or powered assemblies. Apply thread-locking compound if vibration is a concern, following the compound manufacturer instructions. Follow applicable ASME or ASTM fastener standards for torque and inspection requirements.