S-90416A111 0.142" ID x 0.506" OD ASME B18.21.1 Internal / External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with dual internal/external teeth design that bites into mating surfaces, preventing loosening under dynamic loads
• Enhanced durability from Rockwell C40 hardness steel construction, maintaining tooth integrity through repeated assembly cycles
• Corrosion-resistant black-oxide finish provides protection against oxidation in industrial environments
• Precision dimensional control with 0.142" ID and 0.506" OD ensures perfect fit for No. 6 screws
• Reliable compliance with ASME B18.21.1 standards guarantees consistent performance and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting global regulatory requirements
• Optimized thickness range (0.023-0.027") provides ideal spring tension while accommodating surface variations

Professional Applications & Engineering Value

These black-oxide steel tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The unique internal/external tooth configuration creates multiple biting points that dig into both the fastener head and mounting surface, effectively resisting rotational forces and vibrational loosening. Engineered to ASME B18.21.1 specifications, these No. 6 washers provide reliable performance in heavy machinery, automotive assemblies, electrical enclosures, and construction equipment where constant motion or impact could compromise standard fasteners. The Rockwell C40 hardness ensures teeth maintain their biting capability through multiple disassembly cycles, while the corrosion-resistant finish extends service life in challenging environments.

Specification Summary & Compliance

This tooth lock washer features precise inch dimensions with 0.142" internal diameter and 0.506" outer diameter, specifically designed for No. 6 screw sizes. Manufactured to ASME B18.21.1 standards with controlled thickness between 0.023-0.027" for consistent performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 233 SVHCs as of 01/17/2023), meeting international environmental regulations for industrial components.