S-91857A550 1/4"-20 x 2" 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 finish
• Exceptional mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
• Optimized for quick assembly with UNC coarse threading and Class 2A thread fit ensuring smooth, precise engagement
• Full-length threading provides maximum grip and holding power across the entire 2" shaft length
• Broad regulatory compliance meets ASME B18.6.3 manufacturing standards while being RoHS 3 and REACH compliant
• Traditional slotted drive offers simple installation with standard screwdrivers in maintenance and repair applications
• Rounded head design combines secure fastening with a smooth, low-profile appearance

Professional Applications & Engineering Value

This 316 stainless steel rounded head screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 2A thread fit ensures rapid installation with consistent torque transmission, reducing assembly time in production environments. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these slotted drive screws ideal for chemical processing equipment, marine hardware, food processing machinery, and outdoor applications where exposure to moisture, chemicals, and temperature variations would compromise inferior fasteners. With full 2" threading providing maximum thread engagement, engineers can specify these screws for structural applications requiring predictable clamp load distribution and vibration resistance.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerances per UNC threading standards with precise 1/4"-20 coarse thread specifications. Manufacturing conforms to ASME B18.6.3 dimensional requirements, ensuring interchangeability and reliable performance. The product is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and meets REACH (EC 1907/2006) regulations for chemical safety, making it suitable for regulated industries and international markets.