Value Collection MP39416 Hex Head Cap Screw 1/2-20 X 4 in

Product Description

The VALUE COLLECTION MP39416 is a Grade 8 steel hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Sized at 1/2-20 UNF thread with a 4-inch length under head, this fastener delivers the elevated tensile strength and hardness associated with Grade 8 classification. The zinc yellow dichromate finish provides corrosion resistance suitable for demanding service environments. Partial threading along the shank allows for precise clamping force and is standard for this length-to-diameter ratio. Manufactured to ASME B18.2.1 dimensional standards, this screw suits maintenance, repair, and fabrication professionals who require a reliable, spec-compliant fastener.

This hex head cap screw is appropriate for use in heavy equipment maintenance, machinery assembly, automotive drivetrain work, and structural steel connections where a fine-thread, high-strength fastener is specified. The 1/2-20 UNF thread pitch is commonly selected when vibration resistance or higher thread engagement strength is required compared to coarse-thread alternatives. It is installed using standard hex tooling and is sold in a package quantity of 10, making it practical for small-batch repair jobs or stocking in a field service kit.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/2-20 UNF fine thread for improved vibration resistance and thread engagement
• 4-inch length under head with partial threading along the shank
• Zinc yellow dichromate finish for corrosion protection in service environments
• Meets ASME B18.2.1 dimensional standards for consistent fitment
• Package quantity of 10 per order unit

Compatibility

Designed as an OEM-style replacement or maintenance fastener for any application specifying a 1/2-20 UNF Grade 8 hex head cap screw with a 4-inch length under head and partial threading per ASME B18.2.1.

Installation Notes

Installation should be performed by a qualified mechanic or fabricator using the appropriate hex socket or open-end wrench sized for a 1/2-inch fastener. De-energize or lock out any equipment before replacing structural or mechanical fasteners per applicable safety procedures. Apply thread lubricant or thread-locking compound only as specified by the equipment manufacturer. Do not exceed recommended torque values as stated in the equipment service documentation.