S-98035A102 4.3 mm ID x 10 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel surface treatment, extending service life in harsh industrial environments.
• Enhanced load distribution due to precise 4.3mm ID and 10mm OD dimensions, preventing surface damage and loosening under vibration.
• Consistent mechanical performance ensured by Rockwell 15N80 hardness, providing reliable strength and durability for M4 screw applications.
• Accurate fit and secure fastening with 1.5-2.4mm thickness range, accommodating slight variations while maintaining clamping force.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Metric system compatibility for seamless integration with international machinery and equipment designs.
• Reduced maintenance needs through robust material and finish, lowering long-term operational costs.

Professional Applications & Engineering Value

These M4 metric flat washers are engineered to address critical fastening challenges in demanding industrial settings. The black-oxide steel construction provides excellent corrosion resistance, making them ideal for automotive assemblies, machinery frames, and outdoor equipment where moisture and chemicals are present. The precise 4.3mm inner diameter and 10mm outer diameter ensure optimal load distribution, preventing bolt head embedment and joint failure under dynamic loads. With Rockwell 15N80 hardness, these washers maintain structural integrity in high-stress applications, reducing the risk of deformation. Their compliance with RoHS 3 and REACH standards makes them suitable for electronics, aerospace, and other regulated sectors requiring environmentally conscious components.

Specification Summary & Compliance

This flat washer features metric dimensions with 4.3mm ID, 10mm OD, and 1.5-2.4mm thickness, designed for M4 screw sizes. It meets standard dimensional tolerances for precision fit and is manufactured from black-oxide steel with a hardness of Rockwell 15N80. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) as of January 17, 2023, ensuring adherence to environmental and safety regulations for industrial use.