S-91327A235 1/2"-13 Shoulder Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with nylon patch thread locker that maintains secure fastening in dynamic applications from -50° to 250°F
• Superior corrosion resistance through 18-8 stainless steel construction with passivated finish for extended service life in harsh environments
• Precision alignment capability with Class 3A thread fit and standardized shoulder diameter ensuring accurate component positioning
• Enhanced installation grip featuring knurled socket head with hex drive for secure tool engagement during torque application
• High-load capacity delivering 70,000 psi tensile strength for demanding mechanical applications
• Reliable shoulder interface with controlled diameter tolerance providing consistent bearing surface for rotating components
• Regulatory compliance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 1/2"-13 UNC shoulder screw with nylon patch thread locker addresses critical challenges in precision machinery and rotating assembly applications. The 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance for harsh operating environments, while the Class 3A thread fit ensures precise engagement with mating components. The integrated nylon patch technology creates permanent locking action that prevents loosening from vibration, eliminating the need for secondary locking devices. The precision shoulder diameter serves as a reliable locating surface for bearings, gears, and linkages, maintaining alignment under operational stresses. These features make it ideal for industrial automation equipment, precision instruments, and machinery where vibration resistance and positional accuracy are critical.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit and UNC coarse thread specification for reliable engagement. The precision shoulder features controlled diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance. The 70,000 psi tensile strength and Rockwell B55 hardness provide verified mechanical performance for demanding applications.