Holo-krome 720003366 Hex Socket Cap Screw 3/4-10 Unc

Product Description

The HOLO-KROME 720003366 is a hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. It features a 3/4-10 UNC thread and measures 13 inches under the head, making it well suited for deep-reach clamping and through-bolt applications. The screw is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces surface glare. Drive engagement is via a 5/8-inch hex socket. Threading is partial, following ASME B18.3 and ASTM A574 standards. Millwrights, maintenance mechanics, and industrial trades install this fastener where high tensile strength and a recessed drive profile are required.

This screw is appropriate for heavy-duty bolted joints in machinery, equipment frames, jigs, fixtures, and structural steel connections. Its partially threaded shank provides a smooth bearing surface through clearance holes, improving shear resistance and joint alignment. The coarse 3/4-10 UNC thread pitch engages quickly and holds well in both tapped plate and hex nut applications. The black oxide finish is typical for indoor or low-humidity service environments where additional coating is not required.

Key Features

• 3/4-10 UNC coarse thread for fast engagement and high clamp load
• 13-inch length under head accommodates deep stack-ups and long through-bolt applications
• Alloy steel construction meets ASTM A574 for high tensile and proof load requirements
• Black oxide finish reduces light reflection and provides mild corrosion resistance
• Partial threading preserves a smooth shank for shear-loaded joints
• 5/8-inch hex socket drive compatible with standard hex keys and socket drivers
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for tapped-hole or through-bolt assemblies requiring a 3/4-10 UNC thread and a 13-inch grip length in alloy steel construction.

Installation Notes

Installation requires a 5/8-inch hex key or socket driver. Power down and de-energize any equipment before accessing fastener locations in live machinery. Verify tapped-hole thread engagement and mating nut grade are compatible with the ASTM A574 alloy steel strength class before torquing. Do not use impact drivers without a proper hex socket adapter rated for the fastener size.