S-95345A110 1/4"-20 x 1/2" ASME B18.13 Stainless Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Superior vibration resistance with integrated internal-tooth lock washer that maintains secure fastening in high-movement applications
• Excellent corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Maximum holding power with 70,000 psi tensile strength and fully threaded design for optimal load distribution
• Quick installation with Phillips No. 3 drive and standard pan head profile for efficient assembly operations
• Reliable thread engagement through UNC coarse threads and Class 2A fit ensuring consistent performance
• Dual-material durability combining 18-8 stainless steel screw with 410 stainless steel washer for comprehensive corrosion resistance
• Industry-standard compatibility meeting ASME B18.13 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

This rounded head Phillips screw with lock washer addresses critical industrial challenges where vibration loosening and corrosion compromise fastener integrity. The internal-tooth lock washer bites into both the mounting surface and screw head, creating permanent resistance to rotational forces in machinery, automotive assemblies, and electrical enclosures. Manufactured from 18-8 stainless steel with passivated finish, the screw maintains its structural integrity in humid, chemical, or outdoor environments where carbon steel fasteners would fail. The UNC coarse threads provide rapid installation in production environments while the fully threaded design ensures maximum thread engagement across the entire 1/2" length. These engineering features make it ideal for maintenance-critical applications requiring long-term reliability without frequent retightening.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance for consistent engagement and features 1/4"-20 UNC coarse threads meeting standard dimensional requirements. Manufacturing complies with ASME B18.13 specifications for mechanical fasteners, ensuring dimensional accuracy and performance reliability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental regulations regarding hazardous substances. Both the screw body and 410 stainless steel washer feature passivated finish for enhanced corrosion protection.