S-93310A257 10-32 x 5/8" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with factory-applied nylon patch thread locker, eliminating the need for separate adhesives and ensuring reliable performance in high-shock environments.
• Superior corrosion resistance provided by 18-8 Stainless Steel construction, ideal for harsh industrial or outdoor applications.
• High-strength mechanical performance with a tensile strength of 70,000 psi and Rockwell B55 hardness for demanding load-bearing applications.
• Secure and precise fastening achieved with a Class 3A UNF fine thread fit, offering tighter tolerances and improved fatigue resistance over standard threads.
• Wide operational temperature range from -70°F to 250°F, maintaining locking integrity in extreme thermal conditions.
• Easy installation and removal with a standard 1/8" hex drive, providing a secure grip for efficient assembly and disassembly.
• Full regulatory compliance with major industrial and environmental standards, ensuring quality and safety for global supply chains.

Professional Applications & Engineering Value

This 10-32 UNF Nylon Patch Lock Screw is engineered to solve critical challenges in machinery, automotive, and aerospace assembly where vibration-induced loosening is a primary failure point. The nylon patch thread locker is permanently bonded to the threads, creating a resilient locking force that withstands continuous shock and dynamic loads without degrading. Manufactured from 18-8 Stainless Steel, it provides excellent resistance to rust and corrosion, making it suitable for use in demanding environments, including marine, chemical processing, and food-grade equipment. The UNF fine thread and Class 3A fit ensure a precise, secure connection that minimizes the risk of thread stripping under high torque, enhancing the longevity and reliability of the assembly. Combined with a rounded head and hex drive, it offers a flush finish and easy installation in confined spaces, delivering consistent performance for industrial fastening applications.

Specification Summary & Compliance

This screw features a 10-32 UNF fine thread with a Class 3A fit for high precision. It is fully threaded and meets ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations.