Bowmalloy 36304 Hex Head Cap Screw 1/4-28 X 1 in Grade 9

Product Description

The BOWMALLOY 36304 is a fully threaded hex head cap screw designed for high-strength fastening in demanding mechanical and structural applications. Manufactured from Grade 9 alloy steel, this fastener delivers superior tensile and proof load strength compared to standard Grade 5 or Grade 8 hardware. The 1/4-28 UNF fine thread profile provides excellent holding power in tight-tolerance assemblies, while the clear zinc chromate finish offers corrosion resistance suitable for general industrial environments. At 1 inch in length under the head, this screw fits compact joint configurations where a short, strong fastener is required. HVAC, mechanical, and industrial service technicians commonly use Grade 9 fasteners when OEM specifications call for high-strength inch-series hardware.

This hex head cap screw is suited for use in residential and commercial mechanical assemblies, equipment mounting, structural bracketing, and industrial machinery where fine-thread, high-strength fasteners are specified. The 1/4-28 UNF thread is commonly found in precision mechanical joints, thin-material assemblies, and applications requiring resistance to vibration loosening. Full threading along the shank allows for maximum thread engagement across the full grip length, making it appropriate for shallow or variable-depth tapped holes.

Key Features

• Grade 9 alloy steel construction for high tensile strength exceeding standard Grade 8 hardware
• 1/4-28 UNF fine thread for superior vibration resistance and precise thread engagement
• Fully threaded shank maximizes holding strength in shallow tapped holes
• Clear zinc chromate finish provides corrosion protection in general-duty environments
• 1 inch length under head suits compact fastening configurations
• Inch measurement system; UNSPSC Code 31161501 for procurement classification

Compatibility

Designed as a high-strength replacement or OEM-style fastener for applications specifying 1/4-28 UNF hex head cap screws in Grade 9 alloy steel. Verify thread class and grip length requirements against equipment specifications before installation.

Installation Notes

Installation is performed by qualified mechanical technicians or tradespeople using standard hex head tooling. Always confirm the mating thread is clean and free of damage before driving the fastener. Do not mix Grade 9 fasteners with lower-grade hardware in the same joint without verifying load calculations. Torque to the equipment manufacturer's specification for the applicable fastener grade and size.