Holo-krome 72380 Hex Socket Cap Screw 1-8 Unc Alloy Steel

Product Description

The HOLO-KROME 72380 is a hex socket cap screw designed for high-strength fastening applications where a compact drive profile is required. Threaded to 1-8 UNC with a 3.5-inch length under head, this screw is partially threaded and accepts a 3/4-inch hex key drive. It is manufactured from alloy steel with a black oxide finish, providing corrosion resistance and a low-reflectance surface. Conforming to ASME B18.3 and ASTM A574 standards, this screw is built for demanding industrial, mechanical, and structural assembly work. Maintenance technicians, millwrights, and machine builders regularly specify this fastener type for equipment assembly and repair.

This screw is suited for applications requiring a recessed drive to avoid interference with surrounding components. The 1-8 UNC coarse thread pitch is well-suited for use in steel and cast iron, offering good resistance to cross-threading and allowing faster assembly. Typical install scenarios include machine frames, tooling fixtures, heavy equipment, and industrial assemblies where torque requirements are high and fastener accessibility is limited. The partial threading engages the grip length securely across joined material while the unthreaded shank resists shear loads.

Key Features

• 1-8 UNC coarse thread for secure engagement in steel and cast iron
• 3.5-inch length under head accommodates thicker material stacks
• Partially threaded shank improves shear load performance
• 3/4-inch hex socket drive accepts standard hex keys and socket drivers
• Alloy steel construction with black oxide coating for corrosion resistance
• Meets ASME B18.3 and ASTM A574 standards for dimensional and mechanical compliance

Compatibility

Designed as an OEM-style and general-use replacement hex socket cap screw for industrial and mechanical assemblies requiring a 1-8 UNC coarse thread fastener conforming to ASME B18.3 and ASTM A574.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with fastener torque practices for ASTM A574 alloy steel cap screws. Use a properly sized 3/4-inch hex key or socket driver to avoid rounding the drive recess. Ensure mating threads are clean and free of debris before installation. De-energize or lock out equipment per applicable safety procedures before servicing any assembly that includes this fastener.