S-98019A238 0.125" ID x 0.255" OD MS51496-P67 Mil. Spec. Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from Passivated 18-8 Stainless Steel ensures long-term reliability in harsh environments.
• Precise dimensional fit with 0.125" ID and 0.255" OD guarantees secure seating for No. 4 screws, reducing assembly errors.
• Enhanced load distribution with controlled thickness (0.028-0.036") minimizes surface damage and loosening under vibration.
• Consistent mechanical performance due to Rockwell C20 hardness, providing durability without brittleness.
• Guaranteed compliance with MS51496-P67 specifications ensures interchangeability and meets stringent aerospace/defense standards.
• Environmental safety with full RoHS 3 and REACH compliance, eliminating hazardous substance risks in regulated industries.
• Broad industrial suitability as a corrosion-resistant flat washer for machinery, electronics, and outdoor applications.

Professional Applications & Engineering Value

This passivated 18-8 stainless steel flat washer addresses critical challenges in industrial fastening, where corrosion and dimensional instability lead to equipment failure. The passivation surface treatment enhances the innate rust resistance of 18-8 stainless steel, making it ideal for humid, chemical-exposed, or marine settings. With an internal diameter of 0.125" tailored for No. 4 screw size, it ensures precise alignment and uniform clamping force, preventing galvanic corrosion in dissimilar metal assemblies. Engineers value its adherence to MS51496-P67 standards, providing reliable performance in aerospace, automotive, and precision instrumentation. The combination of Rockwell C20 hardness and controlled thickness delivers optimal stress distribution, extending the service life of connected components under dynamic loads.

Specification Summary & Compliance

This flat washer meets exact dimensional tolerances with ID 0.125", OD 0.255", and thickness 0.028-0.036", conforming to MS51496-P67 military specifications for consistent quality. Manufactured from Passivated 18-8 Stainless Steel, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are present. The washer is designed for use with No. 4 screw size in inch-system applications, supporting industry standards for corrosion-resistant fastening solutions.