S-90276A126 5-40 x 3/8" ASME B18.6.3 Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in harsh industrial environments
• Exceptional tensile strength rated at 60,000 psi for reliable load-bearing performance in demanding applications
• Precise Class 2A thread fit ensures smooth installation and secure fastening with reduced risk of cross-threading
• Full threading design provides maximum grip length and uniform stress distribution across the entire fastener
• Standard slotted drive offers compatibility with common tools for straightforward installation and maintenance
• Comprehensive regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety
• Rockwell B69 hardness maintains structural integrity under vibration and mechanical stress conditions

Professional Applications & Engineering Value

These 5-40 UNC zinc-plated steel rounded head screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of coarse threading and Class 2A thread fit ensures rapid installation with minimal binding, while the fully threaded design provides consistent clamping force across the entire engagement length. The zinc-plated surface treatment creates a protective barrier against oxidation and environmental degradation, making these slotted drive screws ideal for electrical enclosures, machinery components, and outdoor equipment where moisture exposure is a concern. With their rounded head profile and standardized dimensions, they offer seamless integration into existing assembly processes while meeting rigorous ASME B18.6.3 specifications for dimensional accuracy and performance consistency.

Specification Summary & Compliance

This fastener features precision 5-40 UNC coarse threads with Class 2A thread fit tolerances, ensuring compatibility with standard mating components. Manufacturing complies with ASME B18.6.3 dimensional standards for consistent quality and interchangeability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. With a specified tensile strength of 60,000 psi and Rockwell B69 hardness, these screws deliver reliable mechanical performance across industrial applications while maintaining full regulatory compliance for global distribution and use.