S-96551A420 0.512" ID x 0.9" OD ASME B18.21.1; MS35333-113; NASM35333 Mil. Spec. Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal teeth that bite into mating surfaces to prevent loosening under dynamic loads
• Exceptional durability thanks to bronze construction with Rockwell B90 hardness for long service life in demanding environments
• Precision fit for 1/2" fasteners with 0.512" ID ensuring optimal contact and locking performance
• Reliable compliance with multiple industry standards including ASME B18.21.1, MS35333-113, and NASM35333
• Corrosion-resistant properties of bronze material providing enhanced performance in various industrial conditions
• Consistent performance maintained through controlled thickness range of 0.037-0.045" for uniform loading
• Wide application compatibility with inch system fasteners commonly used in industrial and mechanical assemblies

Professional Applications & Engineering Value

This bronze tooth lock washer delivers critical vibration resistance in high-stress mechanical assemblies where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the fastener and bearing surface, effectively preventing rotational loosening caused by vibration, thermal cycling, or dynamic loads. Manufactured from bronze material with Rockwell B90 hardness, this washer maintains its locking force without deforming under pressure while offering natural corrosion resistance. Ideal for industrial machinery, automotive systems, and heavy equipment applications, this 1/2" internal tooth lock washer ensures long-term reliability in environments where conventional flat washers would fail. The combination of material strength and precise tooth geometry addresses the common engineering challenge of maintaining bolt preload in vibrating assemblies.

Specification Summary & Compliance

This precision bronze tooth lock washer features a 0.512" inner diameter for 1/2" screw applications, 0.9" outer diameter, and thickness ranging from 0.037" to 0.045". The washer conforms to ASME B18.21.1 dimensional standards and meets the stringent requirements of MS35333-113 and NASM35333 specifications for tooth lock washers. Manufactured with internal tooth location and Rockwell B90 hardness, this component is produced under quality systems ensuring consistent performance and dimensional accuracy for industrial applications requiring reliable vibration-resistant fastening solutions.