Bowmalloy 36029 Hex Head Cap Screw 5/16-18 X 1 in Grade 9

Product Description

The BOWMALLOY 36029 is a fully threaded hex head cap screw designed for high-strength fastening applications across industrial, mechanical, and structural assemblies. Built from Grade 9 alloy steel, this fastener delivers superior tensile strength compared to standard Grade 5 or Grade 8 hardware, making it a reliable choice where load demands are high. The 5/16-18 thread size paired with a 1-inch length under the head suits a wide range of clamping and bolting tasks. A zinc-plated clear chromate finish provides corrosion resistance in moderately exposed environments. Licensed trades and maintenance professionals reach for this grade when critical joint integrity is required.

This cap screw is suited for use in mechanical equipment assemblies, HVAC equipment mounting, electrical enclosure hardware, and general industrial fabrication. The 5/16-18 UNC thread pattern is one of the most common inch-series coarse thread sizes, making it compatible with a broad range of tapped holes, nuts, and threaded inserts found across commercial and light industrial equipment. Fully threaded construction allows maximum thread engagement even in thinner material sections, reducing the risk of fastener pull-through under load.

Key Features

• Grade 9 alloy steel construction for high tensile and proof load strength
• Fully threaded shank for maximum thread engagement in thin or thick material
• 5/16-18 UNC coarse thread - one of the most widely used inch-series fastener sizes
• 1 inch length under head suits standard clamping and through-bolt applications
• Zinc-plated clear chromate finish provides moderate corrosion resistance
• Inch measurement system for compatibility with standard SAE tooling and hardware

Compatibility

Designed as an OEM-style replacement or standard-stock hex head cap screw for any application requiring a 5/16-18 x 1 inch fully threaded Grade 9 alloy steel fastener with a zinc-plated clear chromate finish.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or licensed tradesperson familiar with fastener grade requirements and torque specifications for the application. Always de-energize or lock out equipment before replacing or tightening hardware on live assemblies. Use a standard SAE hex socket or wrench sized for 5/16-18 cap screws and apply torque per the joint designer's specification for Grade 9 hardware. Do not substitute a lower-grade fastener in applications where Grade 9 strength is specified.