Holo-krome 72030 Hex Socket Cap Screw 5-40 Unc Alloy Steel

Product Description

The HOLO-KROME 72030 is a hex socket cap screw engineered for high-strength fastening in precision mechanical assemblies. It features a 5-40 UNC thread form and measures 3/8 inches in length under the head with full threading along that length. A 3/32-inch hex drive socket accepts a standard hex key or Allen driver. Manufactured from alloy steel with a black oxide coating, this fastener delivers solid corrosion resistance and meets ASME B18.3 and ASTM A574 standards. It is well suited for close-tolerance applications where a low-profile socket head and reliable clamping force are required.

This screw is used in light-gauge mechanical assemblies, instrument panels, small motors, electronic enclosures, and precision machine components where a 5-40 thread is specified. The fully threaded shank ensures maximum thread engagement across the full 3/8-inch grip length. The black oxide finish reduces surface reflectivity and provides mild corrosion protection in dry or lightly oiled environments. Installers typically use this fastener in fabrication, OEM assembly, and field repair work on equipment with fine-thread fastener requirements.

Key Features

• 5-40 UNC thread with full threading for maximum engagement
• 3/8-inch length under head suits compact fastening applications
• 3/32-inch hex drive compatible with standard hex keys and bit drivers
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide coating provides mild corrosion resistance and low reflectivity
• Conforms to ASME B18.3 dimensional standards for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for any 5-40 UNC tapped hole requiring a 3/32-inch hex drive fastener in alloy steel.

Installation Notes

This fastener is installed by machinists, millwrights, and assembly technicians using a 3/32-inch hex key or T-handle driver. Ensure the mating tapped hole is clean and free of debris before driving. Do not exceed the rated torque range for a 5-40 alloy steel socket cap screw as specified by ASME B18.3 or the equipment manufacturer. Apply a thread lubricant or anti-seize only when specified by the assembly documentation.