S-95345A018 2-56 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-motion environments
• Excellent corrosion protection through 18-8 stainless steel construction with passivated finish for extended service life
• High tensile strength rating of 70,000 psi ensures reliable performance under demanding mechanical loads
• Quick installation and removal with Phillips No. 1 drive and coarse UNC threads for efficient assembly operations
• Precise thread engagement with Class 2A thread fit providing consistent, reliable fastening without cross-threading risks
• Dual-material protection combining 18-8 stainless steel screw with 410 stainless steel washer, both passivated for uniform corrosion resistance
• Regulatory compliance assurance meeting ASME B18.13 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

This 2-56 UNC rounded head Phillips screw with integrated internal-tooth lock washer addresses critical vibration-induced loosening in industrial equipment, machinery, and electronic enclosures. The combination of 18-8 stainless steel construction and passivated finish provides exceptional corrosion resistance in harsh environments, while the coarse thread design ensures rapid installation and reliable holding power. The 410 stainless steel washer with its internal teeth bites into both the workpiece and screw head, creating a permanent locking action that eliminates the need for additional locking compounds or secondary fastening methods. This engineered solution is particularly valuable in vibration-prone applications where maintaining clamp load is essential for operational safety and equipment longevity.

Specification Summary & Compliance

This fully threaded 1/2" screw features Class 2A thread fit per UNC standards with right-hand threading and pan head style. Manufacturing and dimensional compliance is verified against ASME B18.13 specifications. The product meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring suitability for global industrial applications with strict material restrictions.