Bowmalloy 36307 Hex Head Cap Screw 1/4-28 X 1.75 in Grade 9

Product Description

The BOWMALLOY 36307 is a Grade 9 alloy steel hex head cap screw with a 1/4-28 UNF thread size and a 1.75-inch length under the head. It features a zinc-plated clear chromate finish that provides corrosion resistance in typical service environments. The fastener is partially threaded, which allows the unthreaded shank to carry shear loads more effectively than a fully threaded design. It is measured in the inch system and conforms to the UNSPSC code 31161501 for inch-series fasteners. Electricians, HVAC technicians, plumbers, and mechanical contractors use hex head cap screws like this one when assembling equipment, mounting components, or securing structural members in trade installations.

This cap screw is suited for general industrial and mechanical assembly applications where high-strength fasteners are required. The 1/4-28 fine thread pitch provides tighter thread engagement than coarse-thread alternatives, making it appropriate for use in harder materials or in applications where vibration resistance is a factor. The Grade 9 material rating indicates a high tensile-strength alloy steel construction appropriate for demanding service conditions. Partial threading makes it a common choice for bolted joints that require a close-tolerance fit between mating parts.

Key Features

• Grade 9 alloy steel construction for high tensile strength
• 1/4-28 UNF fine thread for increased vibration resistance and thread engagement
• 1.75-inch length under the head accommodates moderate-depth joint stacks
• Zinc-plated clear chromate finish provides baseline corrosion protection
• Partially threaded shank improves shear load performance at the joint
• Inch-system dimensions for direct compatibility with standard SAE tooling

Compatibility

Designed for use in standard 1/4-28 UNF tapped holes in inch-series mechanical assemblies, equipment panels, and structural brackets across HVAC, electrical, plumbing, and general industrial applications.

Installation Notes

Installation requires a hex-drive wrench or socket sized to the fastener head. Ensure mating threads are clean and free of debris before assembly. Verify the receiving material is rated to accept Grade 9 fastener loads to avoid thread strip-out. Follow applicable torque specifications from the equipment manufacturer or relevant industry standards for the joint material and fastener size.