Holo-krome 72174 Hex Socket Cap Screw 3/8-16 Unc Alloy Steel

Product Description

The HOLO-KROME 72174 is a hex socket cap screw designed for high-strength fastening in mechanical assemblies, tooling fixtures, and industrial equipment. It features a 3/8-16 UNC thread and a 5/16 inch hex drive, requiring a standard hex key or Allen wrench for installation and removal. Constructed from alloy steel with a black oxide finish, the fastener resists mild corrosion and surface oxidation while maintaining high tensile strength. The 3 inch length under head with partial threading allows the unthreaded shank to bear shear loads in close-tolerance applications. This screw meets ASME B18.3 and ASTM A574 standards, making it suitable for demanding mechanical and structural fastening work.

The 72174 is suited for use in machine tool setups, jigs, fixtures, hydraulic components, and general industrial assemblies where socket-drive access is limited or a flush, low-profile head is required. The 3/8-16 UNC coarse thread pattern offers good thread engagement and easy assembly in steel and aluminum tapped holes. Partial threading is particularly useful in applications that require a precision grip length or controlled clamping force between assembled components.

Key Features

• 3/8-16 UNC coarse thread for reliable engagement in tapped steel and aluminum
• 3 inch length under head with partial threading for controlled grip length
• 5/16 inch hex socket drive compatible with standard Allen keys and socket drivers
• Alloy steel construction rated to ASTM A574 for high tensile strength
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-fit fastener for any application requiring a 3/8-16 UNC hex socket cap screw with a 3 inch length under head per ASME B18.3.

Installation Notes

Installation is typically performed by machinists or maintenance mechanics using a 5/16 inch hex key or Allen socket driver. De-energize and lock out all equipment before replacing fasteners in assemblies under load or pressure. Apply appropriate thread lubricant or thread-locking compound per the equipment manufacturer's torque and preload requirements. Consult ASME or equipment OEM documentation for torque specifications applicable to this thread size and material class.