S-91857A845 4-40 x 3/4" ASME B18.6.3 Stainless Steel Round Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under load
• Precision thread engagement with Class 2A thread fit and 4-40 UNC coarse threading ensuring secure fastening in various materials
• Full-length threading provides maximum grip and adjustment flexibility across the entire 3/4" length
• Industry-standard compliance with ASME B18.6.3 specifications for guaranteed dimensional accuracy and performance
• Environmental regulation adherence through RoHS 3 and REACH compliance for safe use in regulated industries
• Traditional slotted drive design with rounded head profile offers familiar installation and streamlined appearance

Professional Applications & Engineering Value

This 316 stainless steel rounded head slotted screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of marine-grade 316 stainless steel and passivated finish provides exceptional protection against chloride-induced stress corrosion cracking, making it ideal for chemical processing, marine equipment, and food processing applications. The 4-40 UNC coarse threading with Class 2A fit ensures rapid installation and secure fastening in softer materials while maintaining vibration resistance. The fully threaded design across the 3/4" length allows for maximum adjustment range and holding power in assemblies requiring precise clamp load distribution. These engineering features address common failure points in industrial fastening, particularly in environments exposed to moisture, chemicals, and thermal cycling.

Specification Summary & Compliance

This precision fastener maintains Class 2A thread fit tolerance with 4-40 UNC coarse threads in right-hand direction and fully threaded configuration. Manufacturing strictly adheres to ASME B18.6.3 specifications ensuring dimensional accuracy for head diameter (0.211"), head height (0.086"), and overall length (3/4"). Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming environmental safety and restricted substance adherence for global industrial applications.