S-96345A250 1/4"-28 MS21044C4, NASM21044 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert technology that maintains secure locking even under continuous motion
• Excellent corrosion resistance with 18-8 stainless steel construction for long-term reliability in harsh environments
• Precise thread engagement with Class 3B fit ensuring consistent performance and reduced risk of cross-threading
• High-temperature capability with nylon insert rated to 250°F (121°C) for demanding industrial applications
• Reusable locking performance allowing multiple installations without significant loss of locking torque
• Standard external hex design for easy installation with common wrench tools and uniform torque application
• Regulatory compliance meeting both REACH and RoHS 3 environmental standards for global applications

Professional Applications & Engineering Value

This 1/4"-28 UNF nylon insert locknut delivers critical vibration resistance in demanding aerospace and industrial applications where fastener failure is not an option. The 18-8 stainless steel construction provides excellent corrosion resistance while the precision Class 3B thread fit ensures consistent engagement and reliable performance. The nylon insert locking mechanism creates constant friction that prevents loosening from vibration, making it ideal for machinery, equipment, and structural assemblies subject to dynamic loads. With compliance to MS21044C4 and NASM21044 specifications, this locknut meets rigorous aerospace standards while offering reusable performance that reduces maintenance costs and downtime in industrial settings.

Specification Summary & Compliance

This locknut features 1/4"-28 UNF fine threads with Class 3B thread fit for precision engagement, manufactured to MS21044C4 and NASM21044 specifications. The external hex design measures 7/16" across flats with a height of 23/64". The right-hand thread direction and nylon insert locking mechanism provide reliable performance up to 250°F maximum temperature. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring suitability for global industrial and aerospace applications.