S-93310A146 6-32 x 3/8" ASME B18.3, ASTM F879, MIL-DTL-18240 Thread-Locking Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Permanent nylon patch thread locker ensures reliable fastening in high-vibration environments, eliminating the need for separate locking washers.
• Superior corrosion resistance: Manufactured from 18-8 Stainless Steel for excellent durability and long-term performance in harsh or outdoor conditions.
• High-strength construction: With a 70,000 psi tensile strength and Rockwell B55 hardness, this screw withstands significant mechanical stress and load.
• Secure and precise fit: Class 3A UNC coarse threads provide a tighter, more precise fit than standard threads, reducing the risk of cross-threading and stripping.
• Wide operational temperature range: The nylon patch locking function remains effective from -70° to 250° F, ensuring performance stability across diverse applications.
• Easy installation and removal: The hex drive (5/64") and rounded button head design allow for high-torque application with a standard hex key and a low-profile, finished appearance.
• Full regulatory compliance: Meets critical industrial and environmental standards, providing assurance for use in regulated projects and global supply chains.

Professional Applications & Engineering Value

This nylon patch locking rounded head screw is engineered to solve critical challenges in assembly and maintenance. The 18-8 Stainless Steel construction provides inherent corrosion resistance, making it ideal for electronics, automotive, and marine applications where exposure to moisture is a concern. The integrated nylon patch acts as a permanent locking element, effectively preventing loosening from vibration—a common failure point in machinery and equipment. Combined with the Class 3A UNC coarse thread and hex drive, this fastener ensures quick, secure installation and a reliable, long-lasting hold that reduces maintenance cycles and downtime in demanding industrial settings.

Specification Summary & Compliance

This screw features a 6-32 UNC coarse thread with a precision Class 3A thread fit and is fully threaded for maximum grip. It is manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent quality and dimensional accuracy. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.