S-91108A440 0.384" ID x 0.692" OD ASME B18.21.1 Internal-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with internal tooth design that bites into mating surfaces to prevent fastener loosening under dynamic loads
• Exceptional corrosion resistance provided by 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Precise dimensional compatibility with 0.384" ID specifically engineered for 3/8" screws, ensuring perfect fit and optimal locking performance
• Reliable compliance with industry standards meeting ASME B18.21.1 specifications for consistent quality and performance
• Environmental regulation compliance with RoHS 3 and REACH standards, making them suitable for regulated industries and international markets
• Durable material integrity maintaining locking performance across temperature variations and corrosive conditions
• Optimized tooth engagement with internal tooth location providing concentrated locking force directly on the fastener

Professional Applications & Engineering Value

These 316 stainless steel internal tooth lock washers deliver critical vibration resistance in demanding industrial applications where fastener security is paramount. The internal tooth configuration creates multiple biting points that dig into both the fastener and mounting surface, effectively preventing rotational loosening caused by machinery vibration, thermal cycling, and dynamic loads. Engineered to ASME B18.21.1 standards, these 3/8" washers provide reliable performance in chemical processing equipment, marine hardware, food processing machinery, and outdoor installations where 316 stainless steel's superior corrosion resistance withstands aggressive environments. The precise 0.384" ID ensures proper fitment on standard 3/8" fasteners, while the controlled thickness range of 0.032-0.040" maintains consistent clamping force without compromising assembly integrity.

Specification Summary & Compliance

This tooth lock washer features precise inch system dimensions with 0.384" internal diameter, 0.692" outer diameter, and thickness ranging 0.032-0.040" specifically designed for 3/8" screw applications. Manufactured in compliance with ASME B18.21.1 standards for dimensional accuracy and performance requirements. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations (updated 06/14/2023, 235 SVHC), ensuring environmental responsibility and chemical safety for industrial applications worldwide.