S-90403A199 8-32 x 1" ASME B18.13 Steel Pan Head Phillips Screws with Internal-Tooth Lock Washer

Key Features & Benefits at a Glance

• Vibration-resistant locking with integrated internal-tooth lock washer prevents loosening under dynamic loads
• Superior corrosion protection through zinc-plated steel construction for extended service life
• High tensile strength rating of 60,000 psi ensures reliable performance in demanding applications
• Optimized drive engagement with No. 2 Phillips head for efficient installation and removal
• Secure fastening performance through fully threaded UNC coarse threads with Class 2A precision fit
• Enhanced load distribution from pan head design with 0.322" diameter for superior clamping force
• Industry compliance assurance meeting ASME B18.13 standards and environmental regulations

Professional Applications & Engineering Value

These zinc-plated steel pan head screws with internal-tooth lock washers provide critical vibration resistance in industrial equipment, machinery assemblies, and electrical enclosures where secure fastening is paramount. The combination of UNC coarse threads and Class 2A thread fit ensures rapid installation while maintaining precise tolerances. The integrated locking mechanism eliminates the need for separate washers, reducing assembly time and preventing costly maintenance from fastener loosening. With 60,000 psi tensile strength and Rockwell B69 hardness, these fully threaded screws deliver reliable performance in high-stress applications across manufacturing, automotive, and heavy equipment sectors.

Specification Summary & Compliance

This 8-32 x 1" screw features precision UNC coarse threads with Class 2A thread fit for consistent engagement. Manufactured to ASME B18.13 specifications with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The zinc-plated steel construction and internal-tooth lock washer provide durable, vibration-resistant performance meeting industrial fastening requirements.