S-90416A115 0.32" ID x 0.898" OD ASME B18.21.1 Internal / External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal/external teeth design that provides maximum locking security in high-stress applications
• Enhanced durability with Rockwell C40 hardness rating ensuring long-term performance under repeated loading cycles
• Corrosion-resistant black-oxide steel construction for reliable operation in demanding industrial environments
• Precise dimensional compatibility with 5/16" fasteners and 0.32" ID/0.898" OD specifications for perfect fitment
• Industry-standard compliance with ASME B18.21.1 ensuring consistent quality and performance expectations
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing acceptance
• Optimal thickness range (0.033-0.037") providing consistent compression and spring action for reliable locking performance

Professional Applications & Engineering Value

This heavy-duty tooth lock washer addresses critical vibration-induced loosening challenges in industrial assemblies. The unique internal/external teeth configuration creates multiple biting surfaces that dig into both the fastener and mating surface, effectively preventing rotational movement under dynamic loads. Manufactured from black-oxide steel, these washers offer superior corrosion resistance while maintaining the necessary spring tension for reliable locking action. The Rockwell C40 hardness ensures teeth maintain their sharp biting edges through repeated installation cycles, making them ideal for machinery, automotive, and heavy equipment applications where vibration resistance is paramount. The combination of precise dimensional control and standardized manufacturing according to ASME B18.21.1 guarantees consistent performance across industrial fastener systems.

Specification Summary & Compliance

This tooth lock washer features precise inch dimensions with 0.32" inner diameter and 0.898" outer diameter, specifically designed for 5/16" screw applications. The thickness is controlled between 0.033-0.037" to ensure proper compression and spring action. Manufacturing and performance comply with ASME B18.21.1 standards for dimensional accuracy and functional requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental substance restrictions for industrial components.