S-91790A540 1/4"-20 x 3/4" ASME B18.6.3 Stainless Steel Slotted Oval Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threading ensures secure fastening and vibration resistance
• Optimized head design with standard oval profile and 82° countersink angle provides flush mounting and improved aesthetics
• Full threading coverage across the entire 3/4" length enables maximum grip and adjustment flexibility
• Industry compliance assurance meeting ASME B18.6.3 specifications for dimensional accuracy and performance reliability
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw delivers critical performance advantages for industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of passivated finish and stainless steel material provides exceptional protection against chemical exposure and atmospheric corrosion, making it ideal for marine, food processing, and outdoor equipment applications. The UNC coarse thread pattern with Class 2A fit ensures rapid installation and secure fastening in various materials, while the oval head design with slotted drive offers both aesthetic appeal and practical installation. Engineers specify this fastener for applications requiring high tensile strength (80,000 psi) combined with regulatory compliance, particularly in assemblies where vibration resistance and long-term durability are essential performance criteria.

Specification Summary & Compliance

This 1/4"-20 x 3/4" flat head screw features precision UNC coarse threads with Class 2A thread fit for optimal engagement and dimensional accuracy. Manufacturing complies with ASME B18.6.3 standards for dimensional consistency and performance reliability. The product meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial applications requiring environmental compliance.