Value Collection D39458 Hex Head Cap Screw 5/8-18 X 4-1/2 in

Product Description

The VALUE COLLECTION D39458 is a partially threaded hex head cap screw designed for high-strength fastening applications. It is manufactured from Grade 8 steel with a Zinc Yellow Dichromate finish that provides corrosion resistance. The screw measures 5/8-18 thread size with a 4-1/2 inch length under head, conforming to the UNF thread standard. It meets ASME B18.2.1 dimensional standards, making it suitable for precision mechanical and structural assemblies. This fastener is used by maintenance technicians, millwrights, and field service professionals working on heavy equipment, industrial machinery, and structural connections.

This cap screw is appropriate for use in industrial, commercial, and heavy-duty mechanical applications where a high-strength Grade 8 fastener is required. The partial threading allows for a smooth shank section, which is beneficial in applications requiring a precise fit through clearance holes or where shear strength is critical. It is commonly used in equipment assemblies, mounting brackets, and structural connections that demand tight dimensional tolerances and reliable clamp load.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc Yellow Dichromate finish provides corrosion and oxidation resistance
• Partially threaded design allows smooth shank through clearance holes
• Conforms to ASME B18.2.1 dimensional standard
• UNF 5/8-18 thread form for fine-pitch engagement
• 4-1/2 inch length under head suits deep fastening applications

Compatibility

Designed as a standard inch-series UNF hex head cap screw compatible with any application requiring a 5/8-18 thread and 4-1/2 inch length under head fastener conforming to ASME B18.2.1.

Installation Notes

Installation should be performed by qualified mechanical or maintenance technicians using the appropriate hex or socket wrench for the fastener head size. Ensure mating threads are clean and free of debris before installation. Follow applicable torque specifications from the equipment manufacturer or relevant industry standards for Grade 8 fasteners. Always de-energize or lock out machinery before replacing or installing structural fasteners.