Bowmalloy 36306 Hex Head Cap Screw 1/4-28 X 1-1/2 in Grade 9

Product Description

The BOWMALLOY 36306 is a Grade 9 alloy steel hex head cap screw sized at 1/4-28 x 1-1/2 inches with a zinc-plated clear chromate finish. This partially threaded fastener is engineered for high-strength bolted connections in demanding mechanical and structural applications. The fine 1/4-28 thread pitch provides superior thread engagement and resistance to loosening under vibration. The zinc clear chromate finish delivers a baseline level of corrosion protection suitable for interior and sheltered exterior installations. Licensed tradespeople and maintenance professionals in HVAC, mechanical, electrical, and general construction trades rely on this fastener where precise torque and thread integrity are critical.

The 36306 is suited for use in mechanical assemblies, equipment mounting, panel fabrication, and general-purpose fastening where a fine-thread, high-strength cap screw is specified. Its inch-system 1/4-28 thread makes it compatible with standard SAE-threaded hardware and tapped holes in ferrous and non-ferrous components. This screw is appropriate for both OEM assembly applications and field service repairs requiring a reliable Grade 9 fastener.

Key Features

• Grade 9 alloy steel construction for high tensile and proof-load strength
• Fine 1/4-28 thread pitch for strong engagement and vibration resistance
• 1-1/2 inch length under head, partially threaded for precise bearing-surface clamping
• Zinc-plated clear chromate finish for baseline corrosion protection
• Inch-system measurement for compatibility with standard SAE hardware

Compatibility

Designed as a standard inch-system hex head cap screw for use in any application specifying a 1/4-28 x 1-1/2 inch Grade 9 alloy steel fastener with partial threading.

Installation Notes

Installation should be performed by a qualified mechanic or tradesperson following applicable fastener torque specifications from the equipment manufacturer or relevant code. Always ensure the mating tapped hole or nut is clean and free of debris before driving the screw. Do not exceed the rated proof load of the fastener. Use calibrated torque tools when precise clamp load is required.