Holo-krome 72140 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 72140 is a hex socket cap screw rated for 5/16-18 UNC threading with a 2-1/2 inch length under head. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light reflection. The drive is a 1/4 inch internal hex socket, accepting a standard hex key or Allen-type driver. This screw is partially threaded and conforms to ASME B18.3 and ASTM A574 standards. It is a general-purpose industrial fastener suited for mechanical assemblies, equipment mounting, and structural joint applications across HVAC, plumbing, electrical, and related trade work.

The HOLO-KROME 72140 is used wherever a high-strength, compact-head fastener is required in tight clearance applications. The socket cap head profile keeps the fastener flush or recessed in counterbored holes, making it well suited for equipment panels, brackets, motor mounts, and similar assemblies. The alloy steel construction and black oxide finish make it appropriate for interior or protected exterior use. Minimum order quantity is 100 pieces per order, and the package quantity is 1.

Key Features

• 5/16-18 UNC thread size for broad hardware compatibility
• 2-1/2 inch length under head, partially threaded configuration
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish provides mild corrosion resistance and low-reflectivity appearance
• 1/4 inch hex socket drive accepts standard hex keys and bit drivers
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for use in mechanical assemblies, equipment frames, and structural fastening applications requiring a 5/16-18 UNC partially threaded fastener.

Installation Notes

Installation is performed with a 1/4 inch hex key or socket driver. Ensure mating threads are clean and free of debris before driving. Apply thread-locking compound or specified torque per the equipment manufacturer guidance where vibration is a concern. Do not over-torque alloy socket cap screws in soft or tapped aluminum or cast housings.