S-98892A116 1/2"-20 NAS1291C8M Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance with center lock distorted thread technology, preventing loosening in high-stress environments
• Exceptional durability from A286 stainless steel construction, offering high strength and corrosion resistance for demanding applications
• Precise thread engagement with Class 3B fit and UNF fine threads, ensuring reliable fastening in critical assemblies
• Integrated flange design with 0.814" diameter, distributing load evenly and eliminating the need for separate washers
• Compliance with aerospace standards through NAS1291C8M certification, guaranteeing performance in regulated industries
• Environmental responsibility with full REACH and RoHS 3 compliance, meeting strict international substance regulations
• Optimized installation with included lubricant, reducing friction and ensuring proper torque during assembly

Professional Applications & Engineering Value

This A286 stainless steel flange lock nut addresses critical vibration-induced failure points in aerospace and industrial machinery. The distorted thread locking mechanism creates consistent interference along the UNF fine threads, maintaining clamp force under extreme dynamic loads where standard nuts would loosen. The integrated flange provides superior bearing surface distribution, reducing stress concentration on joined materials. Manufactured to NAS1291C8M specifications with Class 3B thread fit, it delivers predictable performance in temperature-cycled environments where vibration resistance and material integrity are paramount. The combination of A286 material properties and center lock technology makes this nut ideal for engine components, structural assemblies, and precision equipment requiring reliable, maintenance-free fastening solutions.

Specification Summary & Compliance

This flange lock nut features 1/2"-20 UNF fine threads with Class 3B thread fit for precision engagement. Manufactured according to NAS1291C8M specifications with external hex drive and center lock distorted thread design. Dimensions include 0.814" flange diameter, 9/16" width, and 13/32" height. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring restricted substance compliance for global industrial applications.