Holo-krome 720002551 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The HOLO-KROME 720002551 is a partially threaded hex socket cap screw with a 1/2-13 UNC thread size and a 5-3/4 inch length under head. Manufactured from alloy steel with a black oxide finish coating, this fastener delivers high tensile strength and corrosion resistance suited to demanding mechanical and structural applications. The 3/8 inch hex drive socket accepts a standard hex key or Allen driver. It conforms to ASME B18.3 and ASTM A574 standards, meeting the mechanical property requirements expected in precision fastening work. The part weighs approximately 0.3 pounds. Trade professionals in mechanical, HVAC, and industrial maintenance will encounter this fastener in equipment assembly and structural panel work.

This cap screw is appropriate for medium-to-heavy duty bolted connections where a recessed hex drive is required for torque application in tight clearance areas. The black oxide coating provides mild corrosion resistance and reduces light reflection on exposed fasteners. Typical applications include machinery frames, equipment enclosures, bracket mounting, and industrial assembly work where alloy steel strength grades are specified. The partial threading allows engagement against unthreaded shank sections, which improves shear load performance in structural joints.

Key Features

• 1/2-13 UNC thread form for reliable engagement with standard UNC-tapped holes
• 5-3/4 inch length under head accommodates thicker material stacks and deep clearance bores
• Partially threaded shank improves shear resistance compared to fully threaded designs
• Alloy steel construction meets ASTM A574 high-strength cap screw requirements
• Black oxide finish provides mild corrosion resistance and a low-reflectance surface
• 3/8 inch hex socket drive compatible with standard hex keys and socket drive tooling

Compatibility

Designed as an OEM-style replacement or stock fastener for any application requiring a 1/2-13 UNC partially threaded hex socket cap screw conforming to ASME B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician using a calibrated torque wrench and the appropriate 3/8 inch hex key or bit driver. De-energize and lock out any equipment before fastener service work begins. Apply thread lubricant or anti-seize only if specified by the equipment manufacturer, as lubricant affects torque-tension relationships. Follow applicable ASME or equipment OEM torque specifications for the 1/2-13 thread size and alloy steel grade.