S-91116A440 20 mm ID x 56 mm OD DIN 9021 Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to Black-Oxide 18-8 Stainless Steel construction, ideal for harsh environments.
• Exceptional load distribution with a 56mm OD and 3.4-4.6mm thickness, minimizing surface stress and preventing material damage.
• Precise fit for M18 screws with a 20mm ID, ensuring secure fastening and reducing assembly time.
• High mechanical strength with a Rockwell B68 hardness, providing reliable performance under heavy-duty conditions.
• Compliance with DIN 9021 standards guarantees dimensional accuracy and interchangeability in metric applications.
• Environmentally responsible manufacturing with full RoHS 3 and REACH compliance, meeting strict regulatory requirements.
• Enhanced durability and longevity from the black-oxide finish, which adds an extra layer of protection against wear.

Professional Applications & Engineering Value

This M18 flat washer is engineered to address common industrial challenges such as joint loosening, corrosion-induced failure, and inconsistent load bearing. Crafted from Black-Oxide 18-8 Stainless Steel, it offers excellent resistance to rust and chemicals, making it suitable for demanding sectors like automotive, marine, and construction. The DIN 9021 specification ensures precise dimensions and a flat profile, which helps distribute clamping force evenly across surfaces, reducing the risk of damage to soft materials. Its metric sizing and robust design provide reliable performance in high-vibration environments, ensuring long-term stability and reducing maintenance needs for industrial assemblies.

Specification Summary & Compliance

This washer conforms to DIN 9021 for dimensional accuracy, including an ID of 20mm, OD of 56mm, and thickness of 3.4-4.6mm. It is manufactured from 18-8 Stainless Steel with a black-oxide surface treatment and a hardness of Rockwell B68. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.