S-98040A113 37 mm ID x 50 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating, extending service life in humid or chemically aggressive environments
• Exceptional load distribution thanks to the 50mm outer diameter, preventing surface damage and loosening under high stress
• Precise fit for M36 screws with 37mm inner diameter, ensuring secure fastening and reducing assembly errors
• Enhanced durability from Rockwell 15N80 hardness, maintaining structural integrity under repetitive loads and vibrations
• Environmental compliance assurance with RoHS 3 and REACH standards, supporting sustainable and regulated industrial operations
• Robust thickness (7.0-7.9mm) providing consistent spacing and reliable performance in heavy-duty applications
• Metric system compatibility for seamless integration into global machinery and equipment designs

Professional Applications & Engineering Value

This M36 flat washer is engineered to address critical challenges in industrial settings where vibration, corrosion, and high mechanical stress compromise fastener reliability. The black-oxide steel construction offers a protective barrier against oxidation and chemical exposure, making it ideal for outdoor machinery, automotive assemblies, and construction equipment. Its metric dimensions and precise 37mm ID ensure a snug fit with M36 screws, minimizing play and distributing clamp load effectively across surfaces. By combining Rockwell 15N80 hardness with a flat profile, this washer resists deformation under heavy loads, reducing maintenance downtime and enhancing the longevity of bolted joints in demanding applications like structural frameworks and heavy manufacturing.

Specification Summary & Compliance

This flat washer adheres to standard metric sizing with an inner diameter of 37mm, outer diameter of 50mm, and thickness range of 7.0-7.9mm, ensuring dimensional accuracy for reliable performance. It is manufactured from black-oxide steel with a hardness rating of Rockwell 15N80, providing consistent mechanical properties. The product complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and is REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.