Value Collection MP39015 Hex Head Cap Screw 1/4-20 X 4-1/2 in Grade 8

Product Description

The VALUE COLLECTION MP39015 is a 1/4-20 UNC hex head cap screw measuring 4-1/2 inches under the head, manufactured from Grade 8 steel with a zinc yellow dichromate finish. Grade 8 is the highest common SAE inch-series fastener grade, offering high tensile and proof load strength suited for demanding structural and mechanical assemblies. The partial threading design provides a smooth shank section under the head, which resists shear loading and allows precise clamping without thread engagement through the full grip length. This fastener is manufactured to ASME B18.2.1 dimensional standards and is installed by mechanics, millwrights, equipment technicians, and maintenance professionals.

This cap screw is used in general industrial, mechanical, and equipment assembly applications where a high-strength inch-series fastener is required. The zinc yellow dichromate finish provides moderate corrosion resistance and serves as a visual identifier for Grade 8 hardware. Typical applications include machinery frames, structural brackets, equipment mounting, and heavy-duty mechanical assemblies. Sold in a package quantity of 25 pieces, this SKU suits both bench-stock replenishment and job-specific procurement.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 1/4-20 UNC thread form per ASME B18.2.1 dimensional standard
• 4-1/2 inches length measured under the head
• Partially threaded shank for improved shear resistance and clamping performance
• Zinc yellow dichromate finish provides moderate corrosion protection and Grade 8 visual identification
• Package quantity of 25 for bench-stock or job-lot use

Compatibility

Designed as a standard 1/4-20 UNC Grade 8 hex head cap screw compatible with any tapped hole, nut, or threaded insert conforming to the 1/4-20 UNC thread standard in accordance with ASME B18.2.1.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using a standard hex wrench or socket driver sized for a 1/4-inch hex head cap screw. Verify mating thread class and engagement length before assembly. De-energize and lock out all equipment per applicable OSHA lockout/tagout procedures before fastener replacement or removal on powered machinery. Do not mix Grade 8 hardware with lower-grade nuts or threaded components, as mismatched grades reduce joint integrity.