S-95345A601 1/4"-20 x 1/2" ASME B18.13 Stainless Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated external-tooth lock washer that maintains clamping force in high-stress environments
• Excellent corrosion protection through passivated 18-8 stainless steel construction for extended service life in harsh conditions
• High tensile strength of 70,000 psi ensures reliable performance in demanding industrial applications
• Quick and secure installation with Phillips No. 3 drive and fully threaded design for maximum engagement
• Precise thread fit with Class 2A UNC coarse threads providing consistent, reliable fastening performance
• Dual-material protection featuring both 18-8 stainless steel screw and 410 stainless steel washer with passivated finishes
• Industry-standard compliance meeting ASME B18.13 specifications for guaranteed quality and interchangeability

Professional Applications & Engineering Value

Engineered for industrial applications where vibration resistance and corrosion protection are critical, these 18-8 stainless steel pan head screws with integrated external-tooth lock washers solve common fastening failures in machinery, equipment assembly, and structural components. The passivated finish on both screw and washer provides enhanced corrosion resistance, while the UNC coarse threads and Class 2A thread fit ensure quick installation and reliable performance in high-vibration environments. The combination of 70,000 psi tensile strength and fully threaded design delivers maximum load distribution and prevents loosening under dynamic loads, making them ideal for manufacturing, automotive, and heavy equipment applications where secure, long-lasting fastening is essential.

Specification Summary & Compliance

This 1/4"-20 x 1/2" stainless steel pan head screw features Class 2A thread fit with UNC coarse threads and right-hand threading direction. Manufactured to ASME B18.13 specifications for dimensional accuracy and performance reliability. The assembly is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The external-tooth lock washer maintains specifications of 0.51" OD and 0.028" thickness, providing consistent locking performance throughout the fastener's service life.