Holo-krome 73160 Hex Socket Cap Screw 5/8-18 Unf

Product Description

The HOLO-KROME 73160 is a hex socket cap screw engineered for high-strength fastening applications in mechanical assemblies, machinery, and structural connections. It features a 5/8-18 UNF thread size with a 3-inch length under the head and is partially threaded, allowing for controlled clamping without threading engagement along the full shank. The 1/2-inch hex drive socket accepts standard hex keys or socket drivers. Constructed from alloy steel with a black oxide finish, it provides reliable tensile strength and moderate corrosion resistance in dry or lightly lubricated environments. Licensed machinists and industrial maintenance technicians are the primary installers.

This screw is suited for use in precision mechanical assemblies where a fine-thread UNF fastener is specified. The 5/8-18 UNF thread pitch is commonly selected for applications requiring greater thread engagement strength compared to coarse-thread alternatives, and is frequently used in automotive, hydraulic, aerospace ground-support, and heavy equipment maintenance contexts. The partial threading allows the shank to act as a locating or shear element where alignment precision matters.

Key Features

• 5/8-18 UNF fine-thread profile for high thread-engagement strength
• 3-inch length under head with partial threading for shank-clearance fitment
• 1/2-inch hex socket drive compatible with standard hex keys and socket drivers
• Alloy steel construction meets ASME B18.3 and ASTM A574 standards
• Black oxide finish provides a low-reflectance surface and light corrosion resistance

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application specifying a 5/8-18 UNF partially threaded socket head cap screw with a 3-inch length under head and 1/2-inch hex drive.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a calibrated hex key or socket driver matched to the 1/2-inch drive. Always clean and inspect the threaded hole before installation to prevent cross-threading. Do not use impact drivers without proper torque control, as alloy steel fasteners at this diameter can be damaged by uncontrolled high-speed driving. Refer to the equipment manufacturer or applicable industry torque tables for proper seating torque based on lubrication condition and joint material.