S-99183A320 M18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through top-lock distorted thread design, preventing loosening in high-stress environments
• Exceptional corrosion protection with zinc yellow-chromate plating that extends service life in harsh industrial conditions
• High-strength performance with Class 10 rating, ensuring reliable fastening in heavy-duty applications
• Precise thread engagement with Class 6H thread fit, providing consistent clamping force and reducing assembly issues
• Easy installation and removal using standard external hex drive, compatible with common tools for efficient maintenance
• Durable metric coarse threading (M18 x 2.5 mm) that resists cross-threading and speeds up assembly processes
• Optimized dimensions (27mm width, 18mm height) for balanced strength-to-weight ratio in space-constrained applications

Professional Applications & Engineering Value

This M18 distorted thread locknut delivers critical vibration resistance in demanding industrial settings where constant motion and dynamic loads compromise standard fasteners. Manufactured from zinc yellow-chromate-plated steel, it provides superior corrosion protection for outdoor equipment, machinery, and transportation applications exposed to moisture and chemicals. The top-lock distorted thread technology creates consistent interference along the mating bolt threads, maintaining clamp load without requiring additional locking devices. With Class 10 strength rating and metric coarse threading, this external hex locknut withstands extreme tension and shear forces in heavy machinery, construction equipment, and automotive assemblies while enabling faster installation than fine-thread alternatives. The combination of distorted thread locking and industrial-grade plating eliminates the need for lock washers or thread-locking compounds, reducing inventory complexity and assembly time.

Specification Summary & Compliance

This M18 x 2.5 mm locknut features Class 6H thread fit per ISO metric standards, ensuring precise dimensional accuracy and interchangeability. The distorted thread locking mechanism provides reliable vibration resistance without compromising thread engagement. Manufactured from zinc yellow-chromate-plated steel with Class 10 strength rating, this external hex locknut meets industrial requirements for heavy-duty applications. The product complies with relevant international standards for metric fasteners and contains no restricted substances under RoHS and REACH regulations.