S-90069A211 0.113" ID x 0.213" OD ASME B18.21.1 Countersunk External-Tooth Lock Washers
Countersunk External-Tooth Lock Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
Geometric Parameters
Special Type Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance with external teeth that bite into mating surfaces to prevent loosening under dynamic loads
- Enhanced corrosion protection through Black Oxide Steel construction for extended service life in harsh environments
- Precise countersunk seating with 82° angle ensuring flush mounting and uniform load distribution
- Optimized dimensional stability with Rockwell C40 hardness maintaining tooth integrity under repeated stress
- Industry-standard compliance meeting ASME B18.21.1 specifications for reliable performance in mechanical assemblies
- Environmental regulation adherence with RoHS 3 and REACH compliance for global supply chain compatibility
- Simplified No. 4 screw compatibility with 0.213" OD and 0.113" ID for quick installation in inch-system applications
Professional Applications & Engineering Value
These external tooth lock washers solve critical fastening challenges in vibration-prone industrial equipment. The Black Oxide Steel material provides inherent corrosion resistance while the precisely angled 82° countersink ensures seamless integration with matching fastener heads. External teeth create permanent biting action that maintains clamp force in heavy machinery, automotive assemblies, and electrical enclosures where constant motion would compromise standard washers. The Rockwell C40 hardness preserves tooth sharpness through multiple installation cycles, delivering reliable vibration resistance without galling or deformation. Engineered for No. 4 screw applications in inch-measurement systems, these washers prevent costly downtime in maintenance-critical operations.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with dimensional accuracy including 0.213" OD, 0.113" ID, and 0.015-0.019" thickness range. The external tooth configuration and 82° countersink angle adhere to industrial locking washer specifications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures material safety and global market acceptance.
