S-90391A117 30 mm ID x 49 mm OD DIN 5406 Spring Lock Washers for Slotted Bearing Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance with an external tooth design that bites into mating surfaces, preventing loosening under dynamic loads.
• Precise compatibility with M30 screws and chamfered bearing nuts per DIN 981, ensuring easy installation and reliable fit.
• Durable steel construction provides excellent strength and corrosion resistance for long-lasting performance in harsh industrial environments.
• Conical spring shape maintains constant tension, compensating for thermal expansion and material relaxation over time.
• Metric precision engineering to DIN 5406 standards guarantees dimensional accuracy (30mm ID, 49mm OD) for consistent assembly results.
• Environmental compliance with RoHS 3 and REACH regulations ensures safe use in global markets without hazardous substances.
• Optimized tab dimensions (5mm width, 2.5mm depth) enhance grip and distribution of locking force across the fastener system.

Professional Applications & Engineering Value

This M30 spring lock washer is engineered to address critical challenges in heavy-duty assemblies where vibration-induced loosening can compromise safety and operational integrity. The conical shape and external teeth work synergistically to create a robust locking mechanism that digs into both the nut and workpiece, maintaining clamp load even under extreme cyclic stresses. Made from high-grade steel, it offers reliable performance in applications such as machinery frames, automotive components, and structural bolting. Compliance with DIN 5406 ensures interchangeability and quality consistency, while the chamfered bearing nut compatibility (per DIN 981) facilitates smooth installation without galling. Ideal for metric fastener systems in manufacturing, construction, and transportation sectors, this washer reduces maintenance downtime and enhances joint reliability.

Specification Summary & Compliance

This washer conforms to DIN 5406 for dimensional accuracy, featuring a 30mm internal diameter, 49mm outer diameter, and 1.250mm thickness with an overall height of 4mm. It is designed for use with M30 screw sizes and chamfered bearing nuts meeting DIN 981. The product is manufactured from steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for international industrial supply chains.