S-90416A117 0.448" ID x 1.07" 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 both mating surfaces for maximum holding power
• Enhanced corrosion protection through black-oxide steel construction, extending service life in demanding industrial environments
• Reliable performance under load with Rockwell C40 hardness ensuring consistent performance in high-stress applications
• Precision dimensional accuracy with 0.448" ID and 1.07" OD providing perfect fit for 7/16" screw applications
• Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use across global markets
• Optimal thickness control between 0.043-0.047" ensuring consistent compression and locking performance

Professional Applications & Engineering Value

This heavy-duty tooth lock washer delivers exceptional engineering value through its black-oxide steel construction and innovative internal/external teeth configuration. The dual-tooth design addresses critical vibration-induced loosening in industrial machinery, automotive assemblies, and heavy equipment where constant motion threatens fastener integrity. The Rockwell C40 hardness ensures the teeth maintain their biting capability without deformation, while the black-oxide surface treatment provides corrosion resistance in environments exposed to moisture and chemicals. Engineered specifically for 7/16" screw applications, this washer solves the persistent challenge of maintaining clamp load in high-vibration scenarios, making it ideal for construction equipment, agricultural machinery, and industrial manufacturing applications where reliability is paramount.

Specification Summary & Compliance

This tooth lock washer features precise dimensional specifications including 0.448" inner diameter, 1.07" outer diameter, and thickness ranging from 0.043" to 0.047". Manufactured to ASME B18.21.1 standards for inch-series lock washers, it ensures proper tooth configuration and material properties. The product demonstrates full compliance with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) requirements, including the latest SVHC list updates. The combination of black-oxide steel material and Rockwell C40 hardness guarantees consistent performance while meeting international environmental and safety standards for industrial fastener applications.