S-98040A101 3.2 mm ID x 12 mm OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through black-oxide steel surface treatment, ideal for humid or chemically aggressive industrial environments
• Exceptional surface durability with Rockwell 15N80 hardness rating, maintaining structural integrity under repeated loading and vibration
• Precise dimensional compatibility with 3.2mm ID and 12mm OD ensuring perfect fit for M3 screw applications in metric assemblies
• Optimized load distribution across 2.5-3.4mm thickness range, preventing surface damage and maintaining joint integrity
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global environmental and safety requirements for industrial components
• Enhanced assembly reliability through consistent flat washer geometry, reducing loosening and maintenance needs in critical applications

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these M3 metric flat washers deliver critical performance advantages through their black-oxide steel construction and precision dimensions. The specialized surface treatment provides superior corrosion resistance, making them ideal for automotive assemblies, electrical enclosures, and outdoor equipment where moisture and chemical exposure are concerns. With Rockwell 15N80 hardness, these washers maintain dimensional stability under high clamping forces and vibration, preventing embedding and surface damage to connected components. The precise 3.2mm inner diameter ensures perfect alignment with M3 screw sizes, while the 12mm outer diameter provides optimal load distribution across a wide surface area. This combination of material properties and dimensional accuracy solves common engineering challenges including galvanic corrosion, joint relaxation, and assembly inconsistency in metric system applications.

Specification Summary & Compliance

This precision flat washer features dimensional specifications of 3.2mm inner diameter, 12mm outer diameter, and 2.5-3.4mm thickness range, engineered for exact compatibility with M3 screw sizes in metric assemblies. The component meets international regulatory standards including RoHS 3 (2015/863/EU) compliance with exemption 6(a) for lead as an alloying element in steel, and full REACH (EC 1907/2006) compliance as of January 17, 2023. Manufactured from high-grade steel with black-oxide surface treatment and hardened to Rockwell 15N80 specification, these washers deliver consistent performance in industrial fastening applications requiring corrosion resistance and mechanical durability.