S-95345A034 4-40 x 3/4" 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 and passivated finish for extended service life
• High-strength performance with 70,000 psi tensile strength suitable for demanding industrial applications
• Reliable thread engagement with Class 2A fit UNC coarse threads ensuring consistent installation and load distribution
• Enhanced assembly efficiency through Phillips drive design providing familiar, straightforward installation
• Dual-material durability combining 18-8 stainless steel screw with 410 stainless steel washer 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 4-40 UNC rounded head Phillips screw with integrated internal-tooth lock washer addresses critical vibration-induced loosening challenges in industrial machinery, electronic enclosures, and precision equipment assemblies. The 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance in harsh environments, while the coarse thread design ensures rapid installation and reliable performance in materials where fine threads might strip. The pan head profile offers optimal bearing surface for secure fastening without excessive protrusion. Combined with the 410 stainless steel lock washer, this fastener delivers permanent vibration resistance that eliminates the need for secondary locking mechanisms, reducing assembly time and maintenance requirements in manufacturing, automotive, and industrial equipment applications.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications (4-40 thread size, 3/4" length). Complies with ASME B18.13 mechanical specifications and meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. The passivated finish on both screw and washer components ensures consistent corrosion protection while maintaining the material's inherent strength characteristics.