Midwest Fasteners Coarse Thread Zinc Plated Steel Hex Nut with Cotter Pin Slot

Midwest Fasteners Coarse Thread Zinc Plated Steel Hex Nut with Cotter Pin Slot

The Midwest Fasteners Slotted Hex Nut family brings a coarse thread, zinc plated steel hex nut with a slotted design to stocking programs, maintenance carts, and production lines. Slots cut across the hex flats accept a cotter pin or locking wire, giving this nut a positive mechanical lock that a plain hex nut cannot match, which matters on connections exposed to vibration, shock, or cyclical loading. This family is available in coarse thread sizes from 1/4"-20 through 1"-8, including 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, 9/16"-12, 5/8"-11, 3/4"-10, and 7/8"-9, so contractors, maintenance techs, and fabricators can standardize on one reliable lockable nut across a wide range of bolt and stud diameters. Made in the United States from steel with a bright, silver zinc finish, each size is sold individually for stocking bins, maintenance carts, and production lines.

Key Features

• Size Range: Coarse thread sizes from 1/4"-20 through 1"-8, covering 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, 9/16"-12, 5/8"-11, 3/4"-10, and 7/8"-9.
• Thread Type: Coarse thread for fast engagement and general-purpose compatibility with standard coarse-thread bolts, screws, and studs.
• Material & Finish: Steel construction with a zinc plated, silver-colored finish for corrosion resistance and a consistent appearance across every size in the family.
• Slotted Design: Slots cut across the hex flats accept a cotter pin or locking wire, giving this nut a mechanical lock that a plain hex nut cannot provide.
• Hex Nut Profile: Standard hex nut shape works with common wrenches and sockets for quick installation and removal, regardless of size selected.
• Country of Origin: Made in the United States, supporting consistent quality control and domestic sourcing requirements on applicable jobs.
• Package: Sold as an individual fastener per size for stocking bins, maintenance carts, and production lines.

Technical Specifications

• Product Size: 1/4"-20 - 1"-8

Typical Applications

• Machinery and equipment assemblies where a cotter pin or safety wire is used to prevent the nut from backing off under vibration.
• Automotive, trailer, and towing hardware connections that require a positive mechanical lock beyond friction alone.
• Agricultural and off-road equipment maintenance where shock loading and constant movement can loosen standard fasteners.
• General fabrication and repair work calling for a coarse thread hex nut with a built-in locking feature.
• Maintenance and MRO stock for facilities that need a reliable backup to standard hex nuts on critical connections across multiple bolt sizes.

Why Midwest Fasteners?

Midwest Fasteners builds this slotted hex nut family from steel with a consistent zinc plated finish across every size, giving contractors and maintenance crews a predictable, corrosion-resistant fastener that fits standard coarse thread hardware from 1/4"-20 up to 1"-8. The slotted hex design adds a simple, proven mechanical locking option for connections where vibration or repeated motion makes a plain nut unreliable. Made in the United States, it is a straightforward choice for stocking programs and jobsite kits that need dependable sizing, material, and finish every time, no matter which diameter in the range is pulled off the shelf, and the slots stand ready whenever a cotter pin or locking wire is called for on a critical connection.