S-90069A219 0.512" ID x 0.976" OD ASME B18.21.1 Countersunk External-Tooth Lock Washers

Key Features & Benefits at a Glance

• Superior Vibration Resistance: The external tooth design bites into mating surfaces, preventing loosening under dynamic loads and ensuring reliable performance in high-stress environments.
• Enhanced Durability with Black Oxide Steel: Offers excellent corrosion resistance and a durable finish, extending service life in demanding industrial applications.
• Precision 82° Countersink Angle: Ensures a flush fit with countersunk screw heads, reducing protrusion and improving safety and aesthetics in assembled products.
• Optimized for 1/2" Fastener Systems: With an ID of 0.512" and OD of 0.976", it provides a secure fit and even load distribution, minimizing the risk of fastener failure.
• High Hardness (Rockwell C40): Maintains tooth integrity and locking force under heavy loads, reducing wear and the need for frequent replacements.
• Compliance with ASME B18.21.1 Standards: Guarantees dimensional accuracy and performance reliability, ensuring compatibility and interchangeability in regulated industries.
• Eco-Friendly and Safe: RoHS 3 and REACH compliant, meeting strict environmental regulations for use in global markets without hazardous substances.

Professional Applications & Engineering Value

This 1/2" external tooth lock washer is engineered to address critical challenges in heavy-duty industrial applications, such as machinery, automotive assemblies, and construction equipment, where vibration-induced loosening can lead to equipment failure. The black oxide steel construction provides a robust barrier against rust, while the external tooth location ensures maximum grip by embedding into surfaces, distributing load evenly to prevent stress concentration. With an 82° countersink angle, it seamlessly integrates with countersunk fasteners, reducing assembly height and enhancing structural integrity. By adhering to ASME B18.21.1 standards, this washer delivers consistent performance, making it ideal for engineers seeking reliable, long-term solutions in high-vibration environments without compromising on safety or compliance.

Specification Summary & Compliance

This washer meets precise dimensional tolerances, including an ID of 0.512", OD of 0.976", and thickness range of 0.037-0.045", designed for 1/2" screw sizes. It conforms to ASME B18.21.1 specifications for lock washers, ensuring high-quality manufacturing and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe use in various industries.