S-91133A213 13 mm ID Square Washers

Key Features & Benefits at a Glance

• Superior load distribution with a 50mm width square design that prevents sinking into soft materials and provides maximum surface contact
• Exceptional corrosion resistance thanks to the galvanized steel construction, ensuring long-term reliability in harsh environments
• Optimized for M10 screw applications with a precise 13mm inner diameter for perfect fit and secure fastening
• Enhanced structural integrity with Rockwell B40 hardness rating that maintains shape under heavy loads and vibration
• 6.0mm thickness provides superior stability and prevents deformation in high-pressure industrial applications
• Full regulatory compliance with RoHS 3 and REACH standards, making it suitable for regulated industries and export markets
• Metric system compatibility ensures seamless integration with international machinery and equipment specifications

Professional Applications & Engineering Value

This M10 square washer delivers critical engineering solutions where standard round washers fall short. The galvanized steel construction provides essential corrosion resistance for outdoor equipment, marine applications, and industrial machinery exposed to moisture and chemicals. The square geometry prevents rotation during assembly, ensuring consistent load distribution across a wider surface area - particularly valuable when fastening to wood, plastic, or other soft materials where round washers might embed. With Rockwell B40 hardness, this metric washer maintains dimensional stability under sustained pressure and vibration, making it ideal for structural steel connections, heavy machinery, and automotive applications where reliability is paramount. The substantial 6.0mm thickness provides the rigidity needed for high-torque applications without compromising the fastener's integrity.

Specification Summary & Compliance

This square washer features precise metric dimensions of 50mm width, 13mm inner diameter, and 6.0mm thickness, engineered for M10 screw applications. Manufactured from galvanized steel with Rockwell B40 hardness rating, it meets industrial standards for mechanical properties and dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) with exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations current as of January 17, 2023, ensuring environmental and safety standards are met for global industrial applications.