Value Collection D39450 Hex Head Cap Screw 5/8-18

Product Description

The VALUE COLLECTION D39450 is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assembly work. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade hardware. The 5/8-18 UNF thread profile provides fine-thread engagement suited to applications requiring precise torque control and resistance to vibration loosening. The 2-1/4-inch length under head makes it appropriate for moderate-depth through-bolt and tapped-hole installations. Meets ASME B18.2.1 standards for dimensional accuracy and mechanical performance.

This cap screw is used across a wide range of trade and industrial applications, including HVAC equipment mounting, plumbing fixture frames, electrical enclosure assembly, and general mechanical fabrication. The fine 5/8-18 UNF thread is commonly found in precision-fit assemblies where standard coarse-thread hardware is not specified. Partially threaded construction ensures a smooth shank section beneath the head, providing clamp load without thread engagement through the full grip length. Suitable for use by millwrights, pipefitters, HVAC installers, and general maintenance technicians.

Key Features

• Grade 8 steel construction provides high tensile and proof load strength
• Zinc yellow dichromate finish offers corrosion and oxidation resistance
• 5/8-18 UNF fine-thread profile for vibration-resistant fastening
• Partially threaded shank allows full clamping force across the grip
• Meets ASME B18.2.1 dimensional standards for consistent fitment
• 2-1/4-inch length under head suits moderate-depth fastening applications

Compatibility

Designed as a standard inch-series hex head cap screw compatible with any 5/8-18 UNF tapped hole or matching nut conforming to ASME B18.2.1 specifications.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson using a properly sized hex wrench or socket. Always verify the mating thread standard matches UNF 5/8-18 before installation to avoid cross-threading. Apply thread-locking compound or hardened washers as required by the application or governing mechanical code. De-energize or depressurize any equipment before replacing or installing fasteners on live assemblies.