Value Collection 73155 Hex Socket Cap Screw 5/8-18 Unf 25pk

Product Description

The VALUE COLLECTION 73155 is a fully threaded hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and industrial equipment. Sized at 5/8-18 UNF with a 2-1/4-inch length under head, it accepts a 1/2-inch hex drive. The fastener is manufactured from alloy steel and finished with black oxide coating, which provides moderate corrosion resistance and reduces light reflection in service environments. This screw meets ASME B18.3 and ASTM A574 standards, making it a recognized choice for structural and precision fastening tasks. Sold in packs of 25.

This hex socket cap screw is suited for applications requiring fine-thread engagement and high clamping force, such as machine frames, jigs, fixtures, dies, and equipment housings. The 5/8-18 UNF thread pitch provides tighter thread engagement than coarse-thread equivalents, making it appropriate where vibration resistance or precise torque control is a priority. Machinists, millwrights, and maintenance technicians commonly use this fastener type across industrial and commercial settings.

Key Features

• 5/8-18 UNF fine thread for high clamping force and vibration resistance
• 2-1/4-inch length under head, fully threaded
• 1/2-inch hex socket drive for standard Allen key or hex bit tooling
• Alloy steel construction meets ASTM A574 mechanical requirements
• Black oxide finish for mild corrosion protection and low-glare appearance
• Conforms to ASME B18.3 dimensional standards

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw for use in any application requiring a 5/8-18 UNF fully threaded fastener with a 1/2-inch hex drive.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a calibrated torque wrench and the appropriate 1/2-inch hex key or socket bit. Ensure mating threads are clean, free of debris, and properly tapped to 5/8-18 UNF specification before driving. Do not exceed the rated torque for ASTM A574 alloy steel fasteners of this diameter. Apply thread lubricant or anti-seize compound only where specified by the equipment manufacturer.