S-90402A190 8-32 x 1/4" ASME B18.13 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
• Enhanced corrosion protection through zinc-plated steel construction for extended service life in industrial conditions
• Optimized driving efficiency with Phillips No. 2 drive design that prevents cam-out and ensures secure installation
• Reliable thread engagement through full UNC coarse threading that provides faster assembly and reduced cross-threading risk
• Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness for heavy-duty applications
• Consistent performance with Class 2A thread fit ensuring precise dimensional accuracy and interchangeability
• Secure rounded head design featuring pan head profile that distributes clamping force evenly while preventing surface damage

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these zinc-plated steel rounded head screws with external-tooth lock washers provide critical vibration resistance in machinery, electrical enclosures, and automotive assemblies. The combination of UNC coarse threading and Class 2A fit ensures rapid installation while maintaining precise tolerances, significantly reducing assembly time in high-volume production. The Phillips No. 2 drive delivers reliable torque transmission without stripping, while the integrated locking mechanism prevents loosening under dynamic loads. These fully threaded screws with 60,000 psi tensile strength offer engineering-grade performance for applications requiring durable fastening solutions that withstand mechanical stress and environmental exposure.

Specification Summary & Compliance

This 8-32 x 1/4" screw features Class 2A thread fit with UNC coarse threading and full thread engagement. Manufactured to ASME B18.13 specifications, the fastener delivers precise dimensional accuracy and mechanical consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards. The zinc-plated steel construction combined with external-tooth lock washer provides reliable performance meeting industrial quality requirements.