Holo-krome 720000290 Hex Socket Cap Screw 5-40 Unc

Product Description

The HOLO-KROME 720000290 is a hex socket cap screw designed for tight-clearance fastening applications where a standard hex head cannot fit. This screw uses a 3/32 inch internal hex drive and measures 5/16 inch in length under the head. It is fully threaded along its entire shank length. The fastener is machined from alloy steel and finished with a black oxide coating, which provides mild corrosion resistance and reduces light reflection in assemblies. It is sized to the 5-40 UNC thread standard and conforms to ASME B18.3 and ASTM A574. Machinists, maintenance technicians, and assembly professionals commonly install this type of screw in precision equipment, tooling, and mechanical subassemblies.

This screw is suited for light-duty mechanical assemblies requiring a compact, flush or recessed fastener. The 5-40 UNC thread designation places it in the fine-pitch range for number 5 screws, making it appropriate for thin-walled components, instrument housings, small brackets, and precision fixtures. It is typically installed in applications where torque control and accurate thread engagement are critical. Both industrial maintenance and OEM production environments use this fastener type. It is sold with a minimum order quantity of 100 pieces per order.

Key Features

• 5-40 UNC thread for fine-pitch engagement in small-diameter applications
• 3/32 inch hex socket drive for use with standard hex keys or Allen wrenches
• 5/16 inch length under head, fully threaded for maximum thread engagement
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and low-reflectance appearance
• Conforms to ASME B18.3 dimensional standard

Compatibility

Designed as an OEM-style and replacement fastener for applications requiring a 5-40 UNC hex socket cap screw with a 5/16 inch under-head length, conforming to ASME B18.3 and ASTM A574 standards.

Installation Notes

Install using a 3/32 inch hex key or ball-end driver; ensure the driver is fully seated in the socket before applying torque to avoid stripping. Verify thread engagement depth and mating material compatibility before installation, particularly in thin or soft substrates. Follow applicable fastener torque guidelines from ASME or the equipment manufacturer for 5-40 alloy steel fasteners. Minimum order quantity is 100 pieces.