Bowmalloy BOW36003 Hex Head Cap Screw 1/4-20 X 7/8 in Grade 9

Product Description

The BOWMALLOY BOW36003 is a fully threaded hex head cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. Manufactured from Grade 9 alloy steel with a Bowma-Guard zinc-plated clear chromate finish, this fastener delivers superior corrosion resistance and tensile strength compared to standard Grade 5 or Grade 8 hardware. The 1/4-20 thread size and 7/8-inch length under head make it a compact yet capable fastener suited for tight-clearance installations. Machinists, millwrights, and maintenance technicians working in demanding environments rely on Grade 9 hardware where standard-grade screws fall short.

This cap screw is suited for use in heavy equipment, agricultural machinery, industrial fabrication, and mechanical assemblies where high clamping force is required. The fully threaded shank allows maximum thread engagement across the full grip length, making it appropriate for thin-material joints and through-bolt applications. The 1/4-20 UNC thread pattern is one of the most common inch-series fastener sizes, compatible with standard 1/4-20 tapped holes and nuts found throughout industrial and commercial equipment.

Key Features

• Grade 9 alloy steel construction for higher tensile strength than Grade 5 or Grade 8 fasteners
• Bowma-Guard zinc-plated clear chromate finish provides corrosion resistance for demanding environments
• Fully threaded shank maximizes thread engagement across the entire length under head
• 1/4-20 UNC thread size for compatibility with standard inch-series tapped holes and nuts
• 7/8-inch length under head suits compact and tight-clearance fastening scenarios
• Sold in a package quantity of 100 units, suitable for production or service stock

Compatibility

Designed as an OEM-style replacement or service fastener for any application requiring a 1/4-20 UNC fully threaded hex head cap screw with a 7/8-inch length under head in Grade 9 alloy steel.

Installation Notes

Installation should be performed by qualified mechanical or maintenance personnel using a properly sized hex wrench or socket driver. Always verify thread engagement and torque to the appropriate specification for Grade 9 fasteners as defined by the applicable equipment service manual or industry standard. Do not mix Grade 9 hardware with lower-grade nuts or inserts, as mismatched grades can compromise joint integrity. Inspect mating threads for damage or contamination before installation.