S-91113A034 0.576" ID x 0.985" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress applications
• Internal tooth design provides maximum bite and surface contact for enhanced locking security
• Zinc-plated steel construction offers excellent corrosion resistance and durability
• Rockwell C44 hardness rating ensures long-term performance under heavy loads
• Precision-engineered dimensions (0.576" ID, 0.985" OD) guarantee perfect fit for 9/16" screws
• ASME B18.21.1 compliance ensures consistent quality and reliable performance
• RoHS 3 and REACH compliance meets international environmental and safety standards

Professional Applications & Engineering Value

This internal tooth lock washer delivers exceptional engineering value in demanding industrial environments where vibration-induced fastener failure is a critical concern. The zinc-plated steel construction provides superior corrosion protection while maintaining the necessary hardness (Rockwell C44) to withstand repeated stress cycles. The internal tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively resisting rotational forces and maintaining clamp load integrity. Ideal for heavy machinery, automotive assemblies, and structural applications using 9/16" screws, this washer solves the common problem of joint relaxation in vibrating systems. The combination of material strength, precise tooth geometry, and protective plating ensures reliable performance in manufacturing, construction, and maintenance operations where safety and reliability are paramount.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.576" internal diameter, 0.985" outer diameter, and thickness ranging from 0.037" to 0.045". Manufactured to ASME B18.21.1 standards for dimensional accuracy and performance requirements, it ensures proper fit and function with 9/16" fasteners. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial components. The internal tooth location provides optimal locking action while maintaining surface contact area for secure fastening applications.