S-91116A390 10.5 mm ID x 30 mm OD DIN 9021 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide 18-8 Stainless Steel, ideal for harsh or outdoor environments
• Enhanced load distribution with precise 30mm outer diameter, reducing surface pressure and preventing material damage
• Reliable hardness performance at Rockwell B68, maintaining shape under high stress and repeated use
• Accurate fit for M10 screws with 10.5mm inner diameter, ensuring secure fastening and reducing assembly errors
• Consistent thickness control between 2.3-2.7mm, providing uniform clamping force and vibration resistance
• Compliance with DIN 9021 standards, guaranteeing dimensional precision and interchangeability in metric systems
• Environmental and safety adherence with RoHS 3 and REACH compliance, meeting global regulatory requirements

Professional Applications & Engineering Value

This M10 metric flat washer delivers critical engineering value by solving common industrial challenges like fastener loosening, surface corrosion, and load concentration. Crafted from Black-Oxide 18-8 Stainless Steel, it offers exceptional durability in aggressive settings—such as chemical processing, marine equipment, or outdoor structures—where moisture and chemicals degrade ordinary washers. The DIN 9021 specification ensures tight dimensional tolerances, enabling seamless integration with M10 screws in machinery, automotive assemblies, and construction frameworks. Its black-oxide finish not only boosts corrosion resistance but also reduces galling, extending service life in high-vibration applications. By distributing loads evenly across a 30mm OD, it prevents joint failure and minimizes maintenance, making it a cost-effective solution for heavy-duty industrial applications.

Specification Summary & Compliance

This washer adheres to DIN 9021 standards, ensuring precise metric dimensions including an ID of 10.5mm, OD of 30mm, and thickness of 2.3–2.7mm. It is manufactured from 18-8 Stainless Steel with a black-oxide surface treatment and hardness of Rockwell B68 for consistent performance. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for global supply chains.