Value Collection MP39418 Hex Head Cap Screw 1/2-20 X 5 in Grade 8

Product Description

The VALUE COLLECTION MP39418 is a partially threaded hex head cap screw designed for high-strength fastening applications. Built to ASME B18.2.1 standards, this fastener features a 1/2-20 UNF thread form and measures 5 inches under the head. The Grade 8 steel construction delivers high tensile and proof load ratings, making it well suited for critical structural and mechanical joints. A zinc yellow dichromate finish provides corrosion resistance and serves as a visual identifier for Grade 8 hardware. Licensed tradespeople and maintenance professionals install these fasteners where precise thread engagement and reliable clamping force are required.

This cap screw is commonly used in heavy equipment assembly, machinery maintenance, automotive drivetrain work, and structural fabrication. The 1/2-20 UNF fine thread pitch offers greater thread engagement per inch compared to coarse thread equivalents, which can be advantageous when working with thinner materials or when precise torque control is needed. Partial threading leaves a shank section that resists shear loads and aids in alignment during assembly. Sold in a package quantity of 10.

Key Features

• Grade 8 steel construction for high tensile strength and proof load capacity
• 1/2-20 UNF fine thread for precise torque control and greater thread engagement
• 5-inch length under head to suit deep fastening applications
• Partially threaded shank resists shear loads and assists part alignment
• Zinc yellow dichromate finish provides corrosion resistance and Grade 8 identification
• Manufactured to ASME B18.2.1 dimensional standards

Compatibility

Designed as a standard 1/2-20 UNF Grade 8 hex head cap screw per ASME B18.2.1, suitable for use in any application requiring an inch-series fine-thread fastener of this size and grade.

Installation Notes

Install using a properly sized hex socket or open-end wrench rated for Grade 8 fastener torque values. Clean mating threads and inspect for damage before assembly. Apply thread lubricant or thread-locking compound only as specified by the equipment manufacturer, as this affects torque-to-clamp-load calculations. Do not substitute Grade 8 fasteners with lower-grade hardware in structural or high-load joints.