S-91102A720 0.12" ID x 0.209" OD ASME B18.21.1 Split Lock Washers

Key Features & Benefits at a Glance

• Superior vibration resistance with a split lock design that maintains consistent tension under dynamic loads, preventing screw loosening in high-stress environments.
• Enhanced corrosion protection from zinc-plated steel construction, ensuring long-term durability and reliability in industrial settings.
• Precise fit for No. 4 screws with a 0.12" inner diameter, providing secure fastening and reducing assembly errors.
• High hardness rating of Rockwell C38 for excellent wear resistance and extended service life under repeated use.
• Compliance with ASME B18.21.1 standards guarantees consistent quality, dimensional accuracy, and interchangeability in professional applications.
• Environmental and safety compliance with RoHS 3 and REACH regulations, making them suitable for global supply chains and sensitive industries.
• Optimized dimensions (0.209" OD, 0.025" thickness) for easy installation and space-efficient designs in confined assemblies.

Professional Applications & Engineering Value

This split lock washer is engineered to address critical challenges in industrial fastening, such as vibration-induced loosening and material fatigue. Made from zinc-plated steel, it offers robust corrosion resistance, making it ideal for machinery, automotive, and electrical enclosures exposed to harsh conditions. The standard split lock design applies continuous spring force, compensating for thermal expansion and load variations to maintain joint integrity. With precise dimensions tailored for No. 4 screw sizes and adherence to ASME B18.21.1, it ensures reliable performance in assembly lines, reducing downtime and maintenance costs. Its compliance with RoHS and REACH further supports sustainable and safe manufacturing practices.

Specification Summary & Compliance

This washer features an inner diameter of 0.12", outer diameter of 0.209", and thickness of 0.025", designed for No. 4 screw sizes with standard split lock type. It meets ASME B18.21.1 specifications for dimensional accuracy and performance, ensuring consistent fit and function. The material is zinc-plated steel with a hardness of Rockwell C38, providing durability and resistance to deformation. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it adheres to environmental and safety standards for industrial use.