S-91757A122 0.576" ID x 0.985" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design prevents fastener loosening in high-stress applications
• Excellent corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh environments
• Enhanced durability with Rockwell C40 hardness maintains structural integrity under heavy loads
• Precise dimensional compatibility with 0.576" ID and 0.985" OD ensures perfect fit for 9/16" fasteners
• Industry-standard compliance with ASME B18.21.1 guarantees consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance meets modern regulatory requirements
• Optimized thickness range (0.037-0.045") provides reliable spring action and consistent locking force

Professional Applications & Engineering Value

This 9/16" internal tooth lock washer delivers exceptional engineering value in demanding industrial environments where vibration-induced fastener failure is a critical concern. The 18-8 stainless steel construction provides outstanding corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or outdoor elements. The precisely engineered internal tooth configuration bites into both the bearing surface and fastener head, creating a mechanical lock that maintains clamp load despite constant vibration and thermal cycling. This heavy-duty washer is particularly valuable in machinery, automotive, and construction applications where safety and reliability are paramount. The combination of Rockwell C40 hardness and controlled thickness ensures consistent spring performance without compromising material integrity, providing long-term vibration resistance that surpasses standard flat washers.

Specification Summary & Compliance

This tooth lock washer features precise inch system dimensions with 0.576" internal diameter and 0.985" outer diameter, specifically designed for 9/16" fasteners. Manufactured to ASME B18.21.1 specifications, it ensures dimensional accuracy and performance reliability. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no substances of very high concern. The internal tooth location provides optimal locking action while the controlled thickness range of 0.037-0.045" guarantees consistent performance across production batches.