Value Collection D39155 Hex Cap Screw 5/8-11 X 3.5 in Grade 8

Product Description

The Value Collection D39155 is a partially threaded hex head cap screw designed for high-strength mechanical fastening applications. Built to ASME B18.2.1 standards, this fastener features a 5/8-11 UNC thread size and measures 3.5 inches under the head. It is manufactured from Grade 8 steel, which delivers the elevated tensile and proof load strength required in heavy-duty bolted assemblies. The zinc yellow dichromate finish provides a layer of corrosion resistance suitable for general industrial and structural use. Machinists, millwrights, and maintenance technicians commonly use this fastener in equipment assembly, structural connections, and machinery repair.

This cap screw is suited for applications where a partially threaded shank is required to provide a bearing surface in the bolt hole or to resist shear loads. Typical installations include structural steel connections, heavy equipment frames, conveyor systems, and industrial machinery assemblies where Grade 8 strength ratings are specified by engineering or OEM requirements. The UNC thread form is the standard for inch-system fasteners in North American trade and industrial use.

Key Features

• Grade 8 steel construction meets high tensile strength requirements for demanding bolted joints
• Partially threaded shank provides a precise bearing surface and improved shear resistance
• 5/8-11 UNC thread size — standard coarse thread for inch-system assemblies
• Zinc yellow dichromate finish for corrosion resistance in general service environments
• Conforms to ASME B18.2.1 for dimensional accuracy and consistency
• 3.5-inch length under head accommodates thicker material stacks

Compatibility

Designed as a standard ASME B18.2.1 inch-series hex head cap screw suitable for use with any 5/8-11 UNC tapped hole or matching hex nut in Grade 8 or lower strength applications.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with proper fastener torque procedures for Grade 8 hardware. Always clean threads and mating surfaces before installation, and use a calibrated torque wrench to achieve the specified clamp load per engineering requirements. Do not substitute Grade 8 fasteners into joints specified for higher-grade or metric hardware without engineering approval. Inspect the fastener and mating threads for damage before assembly.