Bowmalloy 36005 Hex Head Cap Screw 1/4-20 X 1-1/4 in Grade 9

Product Description

The BOWMALLOY 36005 is a Grade 9 alloy steel hex head cap screw with a 1/4-20 thread size and a 1-1/4 inch length under the head. It features a zinc-plated clear chromate finish for corrosion resistance in demanding environments. The partially threaded shank provides a clamping grip zone beneath the head, making it well suited for bolted joint applications where shank engagement matters. This fastener is installed by electricians, HVAC technicians, plumbers, and general mechanical trades wherever a high-strength inch-series cap screw is required.

Grade 9 alloy steel offers greater tensile strength than the more common Grade 5 and Grade 8 fasteners, making the 36005 appropriate for high-load or vibration-prone assemblies. Typical applications include mechanical equipment frames, HVAC unit mounting, electrical enclosure assembly, and structural panel attachment in both residential and light commercial settings. The clear chromate zinc plating provides a baseline level of corrosion protection suitable for indoor and semi-sheltered installations.

Key Features

• Grade 9 alloy steel construction for high tensile strength in demanding bolted joints
• 1/4-20 UNC thread size in the inch measurement system
• 1-1/4 inch length under the head for precise clamping reach
• Partially threaded shank provides an unthreaded grip zone beneath the head
• Zinc-plated clear chromate finish for corrosion resistance
• Hex head drive compatible with standard sockets and wrenches

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 1/4-20 thread fastener with Grade 9 alloy steel strength and a zinc-plated clear chromate finish.

Installation Notes

Installation does not require a licensed trade but is commonly performed by HVAC technicians, plumbers, and electricians during equipment assembly or service. Use a properly sized hex socket or wrench to avoid rounding the head. Follow applicable torque specifications from the equipment manufacturer for 1/4-20 Grade 9 fasteners. Inspect threads for damage before installation and never force a cross-threaded fastener.