S-91327A177 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker maintains secure fastening from -50° to 250°F, preventing loosening in dynamic applications
• Exceptional corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh industrial environments
• Precision Class 3A thread fit provides superior mating accuracy and consistent assembly performance
• High tensile strength of 70,000 psi delivers reliable load-bearing capacity for demanding mechanical applications
• Knurled socket head design offers enhanced grip for easier installation and removal while preventing tool slippage
• Standardized shoulder dimensions with tight tolerances ensure precise component alignment and smooth rotational movement
• Comprehensive regulatory compliance with ASME B18.3, RoHS 3, and REACH standards guarantees quality and environmental safety

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw with nylon patch locking addresses critical vibration and alignment challenges in precision machinery. The 18-8 stainless steel construction provides excellent corrosion resistance for demanding environments including manufacturing equipment, automotive assemblies, and electronic enclosures. The Class 3A thread fit ensures precise engagement with mating components, while the standard shoulder diameter maintains accurate component positioning in rotating assemblies and bearing applications. The integrated thread locker eliminates the need for separate locking compounds, streamlining assembly processes in industrial applications where vibration resistance is paramount. The combination of Rockwell B55 hardness and 70,000 psi tensile strength provides durable performance in high-stress mechanical systems.

Specification Summary & Compliance

This precision shoulder screw features 3/8"-16 UNC coarse threads with Class 3A fit for superior mating accuracy. The shoulder maintains tight dimensional tolerances with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications, this fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The nylon patch thread locker operates effectively across a temperature range of -50° to 250°F, ensuring reliable performance in varied operating conditions.