S-98892A800 2-56 NAS1291C02M Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread technology, preventing loosening in high-stress environments
• Enhanced durability with A286 stainless steel construction, offering excellent corrosion resistance and high-temperature performance
• Integrated flange design eliminates need for separate washers, providing larger bearing surface and reducing assembly time
• Precision Class 3B thread fit ensures secure mating with mating components for reliable, long-term fastening integrity
• NAS1291C02M certification guarantees compliance with rigorous aerospace and industrial standards for critical applications
• Pre-applied lubricant facilitates smooth installation while minimizing galling and thread damage during tightening
• External hex drive allows for standard tool compatibility and efficient installation in confined spaces

Professional Applications & Engineering Value

This A286 stainless steel flange lock nut delivers exceptional performance in demanding environments where vibration resistance is critical. The center lock distorted thread technology creates consistent interference along the thread engagement, effectively resisting loosening under dynamic loads. The integrated flange distributes clamping force over a wider area, reducing stress concentration and surface damage. Particularly valuable in aerospace assemblies, industrial machinery, and automotive systems, this NAS1291-certified fastener maintains clamping force integrity where safety and reliability are paramount. The combination of UNC coarse threading and premium material ensures reliable performance in high-temperature applications up to 1300°F (704°C), making it ideal for engine components, exhaust systems, and structural frameworks.

Specification Summary & Compliance

This 2-56 UNC flange lock nut features Class 3B thread fit for precision engagement with mating components. Manufactured to NAS1291C02M specifications with right-hand thread direction and coarse thread spacing. The external hex drive (1/8" width) and standard profile ensure compatibility with common installation tools. Flange diameter measures 0.167" with 0.01" thickness. Fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, containing no restricted substances. Includes lubricant for optimal installation performance.