Value Collection D39451 5/8-18 X 2-1/2 in Grade 8 Cap Screw

Product Description

The VALUE COLLECTION D39451 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and construction settings. Sized at 5/8-18 (Unified National Fine thread) with a 2-1/2 inch length under head, this fastener is manufactured from Grade 8 steel, which provides high tensile strength suitable for demanding load-bearing connections. A zinc yellow dichromate finish offers corrosion resistance and is visually identifiable for grade verification. Manufactured to ASME B18.2.1 standards, this screw is suited for use by machinists, maintenance technicians, and mechanical contractors working in inch-dimensioned assemblies.

This hex head cap screw is used in a wide range of mechanical and structural assemblies where a fine-thread, high-strength fastener is required. Fine thread (UNF) fasteners like this are preferred in applications requiring greater thread engagement strength or precise torque control, such as machinery mounts, equipment frames, flanged connections, and vibration-prone assemblies. The partial threading allows a smooth shank section for shear load bearing, making it appropriate for close-tolerance bolt holes in steel fabrication and maintenance work.

Key Features

• Grade 8 steel construction provides high tensile strength for demanding fastening applications
• 5/8-18 UNF thread offers fine-pitch engagement for improved clamp load and vibration resistance
• Partially threaded shank supports shear load bearing in close-tolerance bolt holes
• Zinc yellow dichromate finish delivers corrosion resistance and enables visual grade identification
• Conforms to ASME B18.2.1 standards for dimensional consistency and quality

Compatibility

Designed as a standard inch-series hex head cap screw for use in any mechanical or structural assembly calling for a 5/8-18 UNF partially threaded fastener meeting ASME B18.2.1 dimensional requirements.

Installation Notes

Installation is typically performed by machinists, millwrights, or mechanical maintenance technicians using a standard hex wrench or socket set sized for a 5/8-inch fastener. Always verify mating thread condition and bore alignment before installation. Apply thread lubricant or thread-locking compound only as specified by the assembly design engineer. Consult applicable mechanical or structural codes for required torque values, as none are defined by the fastener specification alone.