S-98017A609 0.125" ID x 0.312" OD NAS1149-CN416R; AN960-C4L Mil. Spec. Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for extended service life in harsh environments
• Exceptional hardness at Rockwell C25 to maintain dimensional stability under load and prevent deformation
• Precision dimensional accuracy with 0.125" ID and 0.312" OD ensuring perfect fit for No. 4 screws in critical assemblies
• Military and aerospace compliance meeting both NAS1149-CN416R and AN960-C4L specifications for reliable performance
• Environmental regulation compliance with full RoHS 3 and REACH adherence for global manufacturing applications
• Optimized load distribution through controlled thickness (0.014-0.018") to prevent surface damage and joint loosening
• Industry-standard compatibility designed for inch system applications across multiple industrial sectors

Professional Applications & Engineering Value

This passivated 18-8 stainless steel flat washer delivers critical engineering solutions where corrosion resistance and dimensional precision are paramount. The passivation surface treatment creates a protective oxide layer that significantly enhances corrosion resistance in chemical, marine, and outdoor applications. Engineered to NAS1149-CN416R and AN960-C4L specifications, this washer provides reliable performance in aerospace, defense, and industrial equipment where vibration resistance and joint integrity are essential. The precise 0.125" ID and 0.312" OD dimensions ensure perfect alignment with No. 4 screws, preventing galling and cross-threading while the controlled thickness maintains consistent clamping force. Ideal for industrial washers applications requiring compliance with stringent military and environmental standards without compromising durability.

Specification Summary & Compliance

This precision flat washer features exact dimensional specifications with 0.125" inner diameter, 0.312" outer diameter, and thickness ranging 0.014-0.018". Manufactured from 18-8 stainless steel with passivation treatment and Rockwell C25 hardness, it complies with NAS1149-CN416R and AN960-C4L military and aerospace standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial applications while maintaining superior corrosion resistance and mechanical properties.