S-95345A113 1/4"-20 x 5/8" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Reliable vibration resistance through integrated 410 stainless steel internal-tooth lock washer that prevents loosening under dynamic loads
• High-strength performance with 70,000 psi tensile strength for demanding applications requiring durable fastening solutions
• Optimized drive engagement with Phillips No. 3 drive style providing secure torque transmission and reduced cam-out risk
• Easy installation compatibility thanks to standard UNC coarse threading and Class 2A thread fit for quick assembly
• Enhanced load distribution from the pan head design that provides a larger bearing surface for improved clamping force
• Full regulatory compliance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 18-8 stainless steel pan head screws with internal-tooth lock washers deliver exceptional engineering value in vibration-prone industrial environments. The combination of passivated finish and 410 stainless steel washer creates a robust corrosion-resistant system that maintains integrity in demanding conditions. The UNC coarse threading and Class 2A thread fit ensure reliable engagement in various materials while the Phillips No. 3 drive provides efficient installation. These rounded head screws are particularly valuable in machinery, equipment assembly, and automotive applications where vibration resistance and long-term reliability are critical. The integrated locking mechanism eliminates the need for additional anti-vibration components, streamlining assembly processes while maintaining 70,000 psi tensile strength performance.

Specification Summary & Compliance

This 1/4"-20 x 5/8" screw features precision UNC coarse threading with Class 2A thread fit for consistent engagement and reliable performance. Manufactured to ASME B18.13 specifications, these screws ensure dimensional accuracy and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. Both the screw body and internal-tooth lock washer feature passivated finish for enhanced corrosion protection while maintaining the mechanical properties of 18-8 stainless steel and 410 stainless steel components.