S-91794A746 4-48 x 1" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Enhanced installation control provided by the slotted drive and high, narrow rounded fillister head design.
• Reliable fastening strength from a 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Precise thread engagement with a Class 2A fit and 4-48 UNF fine thread, ensuring secure, vibration-resistant connections.
• Full 1-inch threading for maximum grip and load distribution along the entire fastener length.
• Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Right-hand thread direction for standard, intuitive assembly in common machinery and equipment.

Professional Applications & Engineering Value

This 4-48 UNF screw with a rounded fillister head and slotted drive is engineered to solve critical fastening challenges in precision industries. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making it suitable for electronics, aerospace assemblies, and medical devices where reliability is non-negotiable. Its fine thread and Class 2A thread fit ensure minimal backlash and secure fastening in vibration-prone applications, reducing maintenance needs and downtime. The high, narrow rounded head profile offers a low-profile yet robust clamping solution, ideal for countersunk or restricted-space installations.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, with a Class 2A thread fit for consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.