S-91613A453 1/4"-20 x 3/8" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh or marine environments
• Exceptional mechanical strength offering 100,000 psi tensile strength and Rockwell B100 hardness for reliable load-bearing performance
• Optimized drive engagement with a high, narrow fillister head and slotted drive for secure tool fit and reduced cam-out risk
• Precise coarse threading (UNC 1/4"-20) with Class 2A fit ensures easy, fast assembly and consistent clamping force
• Full threading along the 3/8" length provides maximum grip and uniform stress distribution in fastened joints
• Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH for assured quality and environmental safety
• Versatile rounded head profile delivers a smooth, finished appearance while minimizing snagging in dynamic applications

Professional Applications & Engineering Value

This 316 Stainless Steel Fillister Head Slotted Screw is engineered to address critical challenges in industrial settings where corrosion resistance, mechanical integrity, and regulatory compliance are paramount. The passivated finish enhances the innate durability of 316 stainless steel, providing extended service life in chemically aggressive or high-moisture environments such as marine equipment, chemical processing plants, and food-grade machinery. Its coarse UNC 1/4"-20 thread and Class 2A thread fit facilitate rapid installation with standard tools, reducing assembly time while maintaining precise alignment. The fully threaded design ensures uniform load distribution, preventing joint failure under vibration or thermal cycling. Ideal for securing components in pumps, valves, and structural assemblies, this screw meets rigorous ASME B18.6.3 specifications, offering engineers a reliable mechanical fastener that combines high tensile strength with environmental regulatory adherence.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing and quality are governed by ASME B18.6.3, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for hazardous substance restrictions. The 316 Stainless Steel material and passivated finish provide consistent performance across the specified tensile strength of 100,000 psi and hardness of Rockwell B100.