Value Collection 39109 Hex Head Cap Screw 1/2-13 X 2-1/4 in Grade 8

Product Description

The VALUE COLLECTION 39109 is a Grade 8 steel hex head cap screw with a 1/2-13 UNC thread and a 2-1/4-inch length under the head. The screw is partially threaded and finished with a zinc yellow dichromate coating that provides corrosion resistance in demanding environments. It conforms to ASME B18.2.1 dimensional standards, making it a reliable choice for structural and mechanical fastening applications where high-strength hardware is required. Machinists, millwrights, maintenance technicians, and general contractors commonly use Grade 8 fasteners in assemblies subject to high tensile and shear loads.

This screw is suited for heavy-duty mechanical assemblies, equipment mounting, steel fabrication, and industrial maintenance work. The partially threaded shank provides a bearing surface useful in applications requiring precise clamping without thread engagement along the full fastener length. Sold in a pack of 25, it is appropriate for both single-repair jobs and small production runs. It is equally at home in shop environments and field installations where high-grade inch-series fasteners are needed.

Key Features

• Grade 8 steel construction for high tensile strength in structural and mechanical applications
• 1/2-13 UNC thread form for broad compatibility with standard inch-series nuts and tapped holes
• Partially threaded shank provides an unthreaded bearing surface for precise clamping
• Zinc yellow dichromate finish improves corrosion resistance over bare steel
• Meets ASME B18.2.1 dimensional standards for consistent fit and interchangeability
• Sold in a pack of 25 for job-site or shop inventory use

Compatibility

Designed for use with standard 1/2-13 UNC inch-series hex nuts, flat washers, and lock washers in accordance with ASME B18.2.1. Suitable for any application requiring a partially threaded, Grade 8 hex head cap screw in a 1/2-13 x 2-1/4-inch configuration.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with inch-series fastener torque requirements for Grade 8 hardware. Always use a calibrated torque wrench and consult applicable engineering specifications or standards for the required clamp load before final tightening. Inspect mating threads and bearing surfaces for damage or contamination before assembly. Do not substitute Grade 8 fasteners with lower-grade hardware in structural or safety-critical connections.