5/16-18 x 1-1/4 Coarse Hex Cap - Grade 5 Box/100

Overview

The 5/16-18 x 1-1/4 Coarse Hex Cap Screw (00274) is designed for general hardware fastening applications requiring a medium-strength, wrench-driven threaded fastener. Supplied by Midwest Fastener in a convenient box of 100, this hex cap screw delivers consistent performance in structural assembly, mechanical, and fabrication environments.

Technical Specifications

Technical Features

• Grade 5 Hardness: Medium-strength classification provides reliable tensile strength for demanding fastening applications without the brittleness of higher-grade hardware.
• Zinc Finish: Zinc coating provides a baseline level of corrosion resistance, extending service life in typical indoor and light-exposure environments.
• Hex Head with 1/2 in Wrench Fit: Standard hexagonal head geometry is compatible with common 1/2 in wrenches and sockets, enabling quick installation and high-torque tightening.
• Coarse Thread (18 TPI): Coarse thread pitch allows for faster installation and greater resistance to cross-threading compared to fine-thread variants.
• 7/8 in Thread Length: Defined thread engagement length ensures predictable clamping load and proper mating depth across standard material thicknesses.
• Box of 100: Bulk packaging reduces per-unit cost and ensures an adequate supply for production runs, repetitive assembly tasks, or job-site stocking.

Applications

• Structural steel assembly and light fabrication where Grade 5 tensile strength is specified.
• Mechanical equipment assembly requiring a standard coarse-thread hex fastener.
• General construction and maintenance tasks utilizing 1/2 in drive tools.
• Replacement fastening in applications originally specified for 5/16-18 hex cap screws.