Value Collection D30066 Hex Cap Screw 3/8-16 X 4 in Grade 5

Product Description

The VALUE COLLECTION D30066 is a 3/8-16 UNC hex head cap screw designed for general mechanical and structural fastening applications. Manufactured from Grade 5 steel with a zinc-plated finish, this fastener delivers solid tensile strength and corrosion resistance suitable for both indoor and light outdoor environments. The screw measures 4 inches in length under the head and features partial threading along the shank, conforming to ASME B18.2.1 dimensional standards. It is a standard inch-system fastener installed by maintenance technicians, millwrights, HVAC mechanics, plumbers, and general contractors wherever a reliable medium-strength hex cap screw is required.

This fastener is suited for residential and commercial maintenance, equipment assembly, structural connections, and mechanical system installations. The 3/8-16 UNC thread pattern is one of the most common coarse-thread sizes in inch-system mechanical work, making the D30066 a practical stocking item for service vans, shops, and job sites. Partial threading allows the unthreaded shank to bear shear loads while the threaded section secures the joint. Minimum order quantity is 10 pieces.

Key Features

• 3/8-16 UNC coarse thread — widely compatible with standard nuts, tapped holes, and threaded inserts
• 4-inch length under head provides extended grip range for thick or stacked material applications
• Grade 5 steel construction meets medium-strength fastener requirements per SAE classifications
• Zinc-plated finish provides baseline corrosion resistance for general service environments
• Partially threaded shank improves shear load performance and precise joint alignment
• Conforms to ASME B18.2.1 for dimensional consistency across hex head cap screw specifications

Compatibility

Designed as a standard inch-system hex head cap screw compatible with 3/8-16 UNC threaded nuts, inserts, and tapped holes in general mechanical, HVAC, plumbing, and structural assemblies.

Installation Notes

Install using a standard hex wrench, socket, or open-end wrench sized for a 3/8-16 hex head cap screw. Ensure mating threads are clean and free of debris before installation. Shut down and de-energize any equipment before performing fastener service on mechanical systems. Follow applicable codes and equipment manufacturer torque guidelines when securing structural or pressure-bearing joints.