S-91144A129 31 mm ID x 56 mm OD DIN 6916, ISO 7416 Structural Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with 31mm ID and 56mm OD, reducing surface pressure and preventing joint failure in heavy-duty applications.
• Superior durability and wear resistance thanks to black steel construction and Rockwell C45 hardness, ensuring long service life under high stress.
• Reliable standardization with compliance to DIN 6916 and ISO 7416, guaranteeing precise dimensions and interchangeability in metric assemblies.
• Enhanced corrosion protection from the black steel finish, offering improved resistance in harsh industrial environments.
• Environmental responsibility with full RoHS 3 and REACH compliance, meeting strict regulations for safe use in global markets.
• Optimal thickness range of 4.4-5.6 mm, providing consistent spacing and vibration damping for M30 screw sizes.
• Versatile heavy-duty performance ideal for construction, machinery, and automotive sectors where high strength and reliability are critical.

Professional Applications & Engineering Value

This M30 DIN 6916 flat washer is engineered from black steel to address common industrial challenges such as bolt loosening, surface damage, and premature wear. Its robust metric design, featuring precise inner and outer diameters, ensures even load distribution across fastened joints, minimizing stress concentrations in heavy-duty equipment. By conforming to ISO 7416 and DIN 6916 standards, it delivers reliable performance in structural steelwork, machinery assembly, and automotive frameworks, where vibration resistance and long-term integrity are paramount. The Rockwell C45 hardness enhances its ability to withstand repetitive loads, making it a trusted component for engineers seeking durability and compliance with RoHS 3 and REACH environmental mandates.

Specification Summary & Compliance

This washer meets DIN 6916 and ISO 7416 specifications, ensuring dimensional accuracy with an ID of 31 mm, OD of 56 mm, and thickness range of 4.4-5.6 mm for M30 screw sizes. It is manufactured from black steel with a hardness of Rockwell C45, providing consistent performance in industrial settings. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms adherence to environmental and safety standards, supporting sustainable procurement practices.