Bowmalloy BOW36478 Hex Head Cap Screw 3/4-16 X 3.5 in Grade 9

Product Description

The BOWMALLOY BOW36478 is a Grade 9 steel hex head cap screw with a 3/4-16 thread size and a 3-1/2 inch length under head. It features partial threading and a Bowma-Guard zinc-plated clear chromate finish for corrosion resistance. This fastener is designed for high-strength bolted joints in heavy equipment, industrial machinery, and structural assemblies where SAE Grade 9 tensile requirements apply. Installation requires a standard hex socket or open-end wrench. Maintenance technicians, millwrights, and equipment mechanics typically use this screw when torque-critical connections demand higher proof load than Grade 5 or Grade 8 hardware.

This cap screw fits inch-series applications requiring a 3/4-16 fine-thread fastener. The fine thread pitch provides greater thread engagement and improved resistance to loosening under vibration compared to coarse-thread equivalents. Typical installation scenarios include agricultural equipment, heavy-duty truck chassis components, hydraulic cylinder end caps, and industrial machinery frames where Grade 9 strength is specified by the OEM or engineering drawing.

Key Features

• Grade 9 steel construction for high-strength, high-proof-load bolted connections
• 3/4-16 fine thread provides superior vibration resistance and precise torque control
• Partially threaded shank allows for controlled clamping force and shear-load bearing
• Bowma-Guard zinc-plated clear chromate finish offers corrosion protection in moderate environments
• Inch measurement system, UNSPSC Code 31161501 for procurement classification

Compatibility

Designed for use in inch-series bolted assemblies requiring a 3/4-16 fine-thread, Grade 9 hex head cap screw with partial threading per SAE and ASTM fastener standards.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with high-strength fastener torque procedures. Always consult the equipment manufacturer's torque specification chart for Grade 9 fasteners before tightening. Ensure mating threads are clean and free of debris before assembly. Do not reuse fasteners that show signs of thread damage, stretching, or corrosion.