S-90576A821 M18 DIN 985, ISO 10511 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision-engineered nylon insert that maintains locking force under dynamic loads
• Exceptional corrosion protection with zinc yellow-chromate plating for extended service life in harsh environments
• High-temperature performance with nylon insert rated up to 220°F (104°C) for demanding applications
• Heavy-duty strength classification with Class 8 rating ensuring reliable performance in high-stress scenarios
• Precision thread engagement with Class 6H thread fit providing consistent, reliable fastening performance
• Industry-standard compliance meeting both DIN 985 and ISO 10511 specifications for global compatibility
• Easy installation and removal with standard external hex drive design for conventional tool compatibility

Professional Applications & Engineering Value

This M18 nylon insert lock nut delivers critical vibration resistance in demanding industrial environments where loosening under dynamic loads poses significant safety and maintenance concerns. The zinc yellow-chromate plated steel construction provides essential corrosion protection for outdoor equipment, machinery, and automotive applications exposed to moisture and chemicals. With its coarse 2.5mm pitch metric thread and Class 6H thread fit, this locknut ensures rapid installation and reliable engagement while maintaining position security in high-vibration scenarios such as power transmission systems, heavy machinery, and transportation equipment. The nylon insert locking mechanism offers reusable locking capability without damaging threads, making it ideal for applications requiring periodic maintenance or adjustment.

Specification Summary & Compliance

This metric locknut features M18 x 2.5mm coarse right-hand threads with Class 6H thread fit tolerance, ensuring precise engagement with mating components. Manufactured to DIN 985 and ISO 10511 standards with Class 8 strength rating, the nut maintains dimensional accuracy and mechanical properties required for industrial applications. Physical dimensions include 27mm width across flats and 18.5mm height. The zinc yellow-chromate plating provides corrosion resistance while complying with RoHS and REACH environmental standards for safe use across various industries.