Value Collection D30170-4 Hex Cap Screw 1-8x4 Grade 5

Product Description

The VALUE COLLECTION D30170-4 is a 1-8 UNC hex head cap screw designed for heavy fastening applications in mechanical, structural, and industrial assembly work. Measuring 4 inches in length under the head, this fastener features partial threading along the shank, which allows for stronger grip in through-bolt and clamping applications. Manufactured from Grade 5 steel and finished with a zinc plating, the screw meets ASME B18.2.1 dimensional standards. It is installed by millwrights, maintenance mechanics, pipefitters, and general industrial technicians wherever a reliable, medium-strength hex fastener is required.

This screw is suited for residential and commercial construction, equipment assembly, and general fabrication work requiring a 1-inch coarse-thread UNC fastener. The zinc-plated finish provides basic corrosion resistance for indoor and light-duty outdoor applications. Partial threading is appropriate for fastening through clearance holes where the unthreaded shank bears shear loads. This size is commonly used in structural steel connections, machinery mounting, and equipment brackets.

Key Features

• 1-8 UNC coarse thread for high torque and strong clamping force
• 4-inch length under head suits deeper through-bolt applications
• Partial threading along shank provides shear resistance at the grip
• Grade 5 steel meets medium-strength mechanical property requirements
• Zinc-plated finish provides basic corrosion protection
• Conforms to ASME B18.2.1 dimensional standards for hex head cap screws

Compatibility

Designed as an OEM-style replacement or standard-stock hex head cap screw for any application requiring a 1-8 UNC, 4-inch, Grade 5, partially threaded hex fastener conforming to ASME B18.2.1.

Installation Notes

Install with a properly sized hex wrench or impact driver socket rated for 1-inch fasteners. De-energize, depressurize, or otherwise render safe any equipment before fastener service. Apply a calibrated torque wrench to achieve the appropriate Grade 5 torque specification for the application as defined by applicable engineering or code references. Do not substitute a lower-grade fastener in assemblies designed for Grade 5 minimum strength.