S-91757A117 0.512" ID x 0.9" OD ASME B18.21.1 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
• Excellent corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• Precise dimensional compatibility with 1/2" screws through 0.512" ID and 0.9" OD for secure fitment
• Enhanced durability with Rockwell C40 hardness maintaining tooth integrity through repeated assembly cycles
• Industry-standard compliance with ASME B18.21.1 specifications ensuring reliable performance
• Environmental regulation adherence through RoHS 3 and REACH compliance for global supply chain compatibility
• Optimized thickness range (0.037-0.045") providing consistent compression and spring action

Professional Applications & Engineering Value

This internal tooth lock washer delivers critical vibration-resistant performance for demanding industrial applications where fastener security is paramount. The 18-8 stainless steel construction provides exceptional corrosion resistance in chemical processing, marine, and outdoor equipment applications. The strategically positioned internal teeth create multiple biting points that dig into both the fastener and bearing surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, or dynamic loading. Engineered to ASME B18.21.1 standards, this washer maintains consistent locking force while the Rockwell C40 hardness ensures teeth retain their biting capability through numerous installation cycles. The combination of material properties and precision engineering makes this component ideal for critical assemblies in automotive, aerospace, and heavy machinery where vibration-induced failure is not an option.

Specification Summary & Compliance

This internal tooth lock washer features precise dimensional specifications including 0.512" inner diameter, 0.9" outer diameter, and thickness ranging from 0.037" to 0.045" specifically designed for 1/2" screw applications. Manufactured in compliance with ASME B18.21.1 standards for tooth lock washers, the component demonstrates full conformity with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 18-8 stainless steel material combined with Rockwell C40 hardness ensures consistent mechanical properties and reliable performance across industrial applications.