S-91794A113 4-40 x 3/4" ASME B18.6.3 Stainless Steel Fillister Head Slotted Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance thanks to 18-8 Stainless Steel construction and a passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 70,000 psi provides secure, reliable fastening for demanding applications, reducing the risk of mechanical failure.
• Rockwell B55 hardness offers excellent durability and resistance to wear, extending the service life of the fastener.
• Coarse UNC thread with Class 2A fit ensures easy, quick assembly and a secure hold, minimizing installation time and errors.
• Fully threaded design allows for maximum grip and adjustability along the entire 3/4" length, providing versatile fastening solutions.
• Rounded fillister head with slotted drive offers a low-profile, aesthetically pleasing finish and simple installation with standard tools.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees consistent quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This 4-40 UNC Rounded Fillister Head Slotted Screw is engineered to address critical challenges in precision assembly and industrial maintenance. Its 18-8 Stainless Steel material, combined with a passivated finish, provides superior resistance to oxidation and chemical exposure, making it ideal for applications in electronics, medical devices, and marine equipment where corrosion resistance is paramount. The coarse thread and Class 2A fit ensure reliable engagement in various materials, reducing the risk of cross-threading and improving assembly efficiency. With a high-strength profile and fully threaded design, it delivers consistent performance in high-vibration environments, ensuring long-term fastener integrity and reducing maintenance costs.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC thread with Class 2A fit for consistent threading accuracy. It meets ASME B18.6.3 specifications for mechanical and dimensional requirements, ensuring reliable performance in industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global markets.