S-3127N18 5.3 mm ID x 22 mm OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Precise flush mounting enabled by the 100° countersink angle, ensuring smooth surface finishes and reduced snagging
• Optimized load distribution from the 22mm outer diameter, minimizing surface pressure and material stress
• Enhanced durability and wear resistance due to Rockwell B83 hardness, maintaining integrity under repeated use
• Accurate fit for M5 screws with a 5.3mm inner diameter, providing secure fastening and vibration resistance
• Full regulatory compliance with RoHS 3 and REACH, ensuring safety for sensitive industries and global supply chains
• Consistent dimensional stability with a thickness range of 3.2-3.8mm, supporting reliable assembly in metric systems

Professional Applications & Engineering Value

This M5 countersunk washer is engineered to address common industrial challenges such as fastener loosening, surface damage, and corrosion-induced failure. Made from 316 stainless steel, it offers exceptional resistance to pitting and crevice corrosion in demanding settings like marine, chemical processing, and food equipment. The 100° countersink angle ensures a seamless fit with corresponding screw heads, eliminating protrusions that can compromise safety and aesthetics. Its metric dimensions and robust Rockwell B83 hardness provide reliable performance in high-vibration machinery, structural assemblies, and precision instruments, reducing maintenance needs and extending service life. By integrating this RoHS and REACH compliant component, engineers achieve both mechanical reliability and environmental responsibility in their designs.

Specification Summary & Compliance

This washer adheres to metric system standards with precise dimensions: ID 5.3mm, OD 22mm, and thickness 3.2-3.8mm, ensuring compatibility with M5 screw sizes. The 100° countersink angle conforms to common engineering specifications for flush installation. Manufacturing complies with material and safety regulations, including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for hazardous substance restrictions, supporting use in regulated industries worldwide.