S-91781A420 00-90 x 3/16" ASME B18.11, ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments and long-term reliability.
• High tensile strength of 80,000 psi ensures dependable fastening under significant mechanical stress, preventing joint failure.
• Precision Class 2A thread fit guarantees smooth assembly and consistent engagement, reducing the risk of cross-threading.
• Standard 82° countersink angle and flat head design provides a flush, secure fit in countersunk holes for a clean, professional finish.
• Fully threaded fine thread design offers maximum grip and holding power in thin materials or short engagement lengths.
• Compliance with ASME B18.11, RoHS 3, and REACH ensures adherence to strict industrial and environmental standards for global supply chain compatibility.
• Right-hand UNS fine thread enables standard installation and reliable performance in precision machinery and equipment.

Professional Applications & Engineering Value

This 00-90 flat head slotted screw is engineered for precision applications where space is limited and reliability is critical. The combination of 18-8 stainless steel and a passivated finish provides exceptional resistance to oxidation and chemical exposure, solving common corrosion issues in electronics, aerospace, and medical devices. Its fine thread and fully threaded design maximize thread engagement in thin sheets or delicate components, preventing stripping and ensuring vibration resistance. The flat head with an 82° countersink sits flush to avoid protrusions, making it ideal for assemblies requiring aerodynamic or aesthetic surfaces. By meeting ASME B18.11 specifications, it delivers consistent dimensional accuracy, reducing installation errors and enhancing production efficiency in automated or manual fastening processes.

Specification Summary & Compliance

This screw features a 00-90 thread size with Class 2A thread fit for precise tolerances, and a length of 3/16 inch. It is manufactured in accordance with ASME B18.11 standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries.