S-3127N17 4.3 mm ID x 16 mm OD Finishing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction, ideal for chemical and marine applications.
• Precise 100° countersink angle ensures flush mounting with M4 screws, reducing protrusion and improving safety in assemblies.
• Optimized dimensions (16mm OD, 4.3mm ID) provide reliable load distribution and secure fit for M4 metric fasteners.
• Enhanced durability with Rockwell B83 hardness, offering long-term performance under mechanical stress.
• Compliance with RoHS 3 and REACH standards guarantees environmental safety and regulatory acceptance in industrial markets.
• Consistent thickness (2.7-3.3 mm) ensures uniform pressure distribution, minimizing loosening in dynamic applications.
• Metric system compatibility simplifies integration with global engineering designs and metric screw systems.

Professional Applications & Engineering Value

This M4 countersunk washer made from 316 stainless steel addresses critical challenges in industries like chemical processing, marine engineering, and food equipment, where corrosion and chemical exposure can degrade fastener integrity. The 100° countersink angle allows for a seamless, low-profile installation with M4 screws, reducing snag risks and improving aerodynamic or hygienic surfaces. Its metric dimensions and robust Rockwell B83 hardness ensure reliable performance in high-vibration environments, preventing joint failure. By combining precision thread standards with a corrosion-resistant design, this washer extends equipment lifespan and minimizes maintenance costs in demanding industrial applications.

Specification Summary & Compliance

This countersunk washer features precise metric dimensions, including an ID of 4.3 mm, OD of 16 mm, and thickness range of 2.7–3.3 mm, designed for M4 screw size compatibility. It adheres to standard metric system tolerances and is manufactured from 316 stainless steel with a hardness of Rockwell B83 for consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.