S-96551A200 0.115" ID x 0.27" OD ASME B18.21.1; MS35333-36; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance prevents fastener loosening in high-stress environments
• Internal tooth design provides maximum grip and uniform load distribution
• Cadmium-plated steel construction offers excellent corrosion resistance and durability
• Rockwell C40-50 hardness rating ensures long-term performance under heavy loads
• Precision inch dimensions (0.115" ID, 0.27" OD) guarantee perfect fit for No. 4 screws
• Multiple specification compliance meets rigorous industrial standards for reliability
• Consistent thickness control (0.015-0.019") ensures uniform clamping force

Professional Applications & Engineering Value

This No. 4 tooth lock washer with internal tooth configuration delivers exceptional engineering value in demanding applications where vibration-induced loosening compromises safety and performance. The cadmium-plated steel material provides superior corrosion protection while maintaining the structural integrity needed for heavy machinery, automotive assemblies, and industrial equipment. The internal tooth design bites securely into both the fastener and mounting surface, creating a permanent locking action that withstands extreme operational stresses. Engineered to meet ASME B18.21.1, MS35333-36, and NASM35333 specifications, this vibration resistant washer solves critical fastening challenges in aerospace, military, and precision manufacturing applications where reliability is non-negotiable.

Specification Summary & Compliance

This internal tooth lock washer features precision inch dimensions with 0.115" inner diameter and 0.27" outer diameter, specifically designed for No. 4 screw sizes. Manufactured to exacting thickness tolerances between 0.015-0.019" and hardened to Rockwell C40-50 standards. Fully compliant with ASME B18.21.1 mechanical washer specifications, along with military standards MS35333-36 and aerospace specification NASM35333. The cadmium-plated steel construction meets industry requirements for corrosion resistance and mechanical performance in demanding industrial environments.