S-90402A201 8-32 x 1 1/4" ASME B18.13 Steel Pan Head Phillips Screws with External-Tooth Lock Washer

Key Features & Benefits at a Glance

• Vibration-resistant locking with integrated external-tooth lock washer prevents loosening in high-stress applications
• Superior corrosion protection through zinc-plated steel construction for extended service life in harsh environments
• Maximum holding power with 60,000 PSI tensile strength and Rockwell B69 hardness for heavy-duty fastening requirements
• Quick installation and reliable grip with UNC coarse thread spacing and Class 2A thread fit for efficient assembly
• Enhanced driving stability through Phillips No. 2 drive and pan head design for secure torque application
• Full thread engagement along the entire 1-1/4" length ensures consistent clamping force distribution
• Regulatory compliance assurance meeting ASME B18.13 standards and environmental regulations for quality and safety

Professional Applications & Engineering Value

These zinc-plated steel screws with integrated external-tooth lock washers provide critical vibration resistance in industrial machinery, automotive assemblies, and electrical enclosures where constant motion threatens fastener integrity. The UNC coarse thread spacing combined with Class 2A thread fit ensures rapid installation while maintaining precise tolerance control, significantly reducing assembly time in production environments. The fully threaded design maximizes surface contact area, distributing clamping force evenly to prevent material deformation in sheet metal, plastic components, and structural frameworks. The Phillips pan head configuration offers superior drive engagement while the zinc plating creates a sacrificial layer that protects against corrosion in outdoor or high-humidity applications, extending maintenance intervals and reducing lifecycle costs.

Specification Summary & Compliance

Manufactured to exacting ASME B18.13 specifications with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threads (8-32 size) with right-hand direction and full threading along the 1-1/4" length. 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 provides positive locking action while maintaining specified tensile strength of 60,000 PSI and Rockwell B69 hardness.