S-91205A203 8-32 x 1 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with Nylon patch thread locker, maintaining secure fastening from -70° to 250°F without loosening
• Exceptional strength and durability from alloy steel construction with 170,000 psi tensile strength and Rockwell C37 hardness
• Precision installation and reliable fit with Class 3A thread tolerance for consistent performance in demanding applications
• Corrosion-resistant black-oxide finish providing enhanced protection in harsh industrial environments
• Optimized drive engagement with standard hex socket head and 9/64" drive for secure torque transmission
• Versatile partial threading with 8-32 UNC coarse thread design for balanced grip and adjustment flexibility
• Industry compliance assurance meeting ASME B18.3 standards for dimensional accuracy and quality

Professional Applications & Engineering Value

These socket head cap screws with Nylon patch locking technology solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and precision equipment. The black-oxide alloy steel construction delivers superior corrosion resistance while maintaining 170,000 psi tensile strength under extreme operating conditions. The 8-32 UNC coarse thread with Class 3A fit ensures precise engagement in threaded holes, reducing installation errors and providing reliable clamping force. The partially threaded design allows for optimal stress distribution, making these industrial screws ideal for applications requiring both secure fastening and adjustment capability in high-vibration environments.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision dimensional accuracy. The 8-32 UNC coarse thread maintains standard compatibility while the partially threaded design provides controlled engagement. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The black-oxide surface treatment on ASTM A574 alloy steel provides consistent corrosion protection while maintaining the specified mechanical properties.