S-91858A550 1/4"-20 x 2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for heavy-duty load bearing
• Reliable thread engagement through full UNC coarse threading with Class 2A fit for secure fastening
• Streamlined flush mounting with standard 82° countersink angle flat head design
• Broad industrial compliance meeting ASME B18.6.3 specifications and global RoHS 3/REACH regulations
• Simplified installation using standard slotted drive for straightforward manual assembly
• Dimensional precision ensuring consistent 2" length and 1/4"-20 thread specifications for uniform performance

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance is critical. The passivated finish provides enhanced protection against chemical exposure and oxidation, making them ideal for marine, chemical processing, and food industry applications. The UNC coarse threading ensures rapid installation and superior holding power in various materials, while the flat head design with standard 82° countersink enables flush mounting for safety and aesthetic requirements. With full threading along the entire 2" length, these slotted drive screws offer versatile fastening solutions for machinery, structural assemblies, and equipment requiring reliable, long-term performance in challenging conditions.

Specification Summary & Compliance

This 1/4"-20 x 2" flat head screw maintains precise Class 2A thread fit tolerances with right-hand UNC coarse threading and standard dimensional specifications. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. The combination of 316 stainless steel material, passivated finish, and controlled Rockwell B80 hardness guarantees consistent mechanical properties and corrosion resistance throughout the fastener's service life.