S-90437A250 4.3 mm ID x 9 mm OD DIN 125 Adhesive-Back Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Secure bonding and vibration resistance thanks to the 1mm thick acrylic adhesive backing that prevents loosening under dynamic loads
• Excellent dimensional stability with precise 4.3mm ID and 9mm OD, ensuring perfect fit for M4 screws and reliable load distribution
• Enhanced durability and surface protection from Rockwell B70 hardness, reducing wear and deformation under pressure
• Wide operational temperature tolerance from 50°F to 200°F, maintaining performance in varied thermal conditions
• Guaranteed standardization and interchangeability through strict adherence to DIN 125 specifications
• Safe for regulated industries with full compliance to RoHS 3 and REACH, ensuring no hazardous substances

Professional Applications & Engineering Value

This M4 metric flat washer is engineered to address critical challenges in assembly and maintenance, where corrosion resistance and secure fastening are paramount. The 316 stainless steel material provides exceptional protection against oxidization and chemical degradation, making it suitable for marine, pharmaceutical, and food processing equipment. The integrated acrylic adhesive layer (1mm thickness) ensures the washer stays firmly in place during installation, reducing assembly time and preventing misalignment in automated or high-vibration systems like machinery and electronics. Its compliance with DIN 125 standards guarantees precise dimensions and reliable performance, while the broad temperature range supports applications from outdoor enclosures to heated industrial units, delivering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This washer meets DIN 125 specifications for dimensional accuracy, with an inner diameter of 4.3mm, outer diameter of 9mm, and thickness of 0.8mm, designed for M4 screw sizes. It is manufactured from 316 stainless steel with a hardness of Rockwell B70 and includes a 1mm acrylic adhesive backing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted substances and safe for use in various industrial and consumer applications.