S-91781A211 8-32 x 3 1/2" 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 industrial environments.
• High tensile strength of 80,000 psi ensures reliable, long-lasting fastening under demanding loads and vibrations.
• Precise Class 2A thread fit with UNC coarse threading for easy installation and secure engagement in a variety of materials.
• 82° countersink angle and flat head design provides a flush, low-profile finish, reducing snagging and improving safety.
• Partially threaded shank allows for controlled clamping force and prevents over-tightening in assembly applications.
• Compliance with ASME B18.6.3 guarantees dimensional accuracy and interchangeability for consistent performance.
• RoHS 3 and REACH compliance ensures environmental safety and meets global regulatory standards for industrial use.

Professional Applications & Engineering Value

This 8-32 UNC flat head slotted screw is engineered to address common industrial fastening challenges, such as corrosion in humid or chemical-exposed settings. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional durability against rust and oxidation, extending service life in machinery, electrical enclosures, and outdoor equipment. The partially threaded design and coarse UNC thread spacing facilitate quick assembly and disassembly, reducing labor time in maintenance-heavy applications. With a Rockwell B80 hardness and high tensile strength, it withstands shear and tensile stresses, making it a reliable choice for heavy-duty fasteners in construction, automotive, and manufacturing sectors where vibration resistance and structural integrity are critical.

Specification Summary & Compliance

This screw features a 3 1/2" length with a min thread length of 1 1/2", Class 2A thread fit for precise tolerance, and UNC coarse thread type for robust holding power. It conforms to ASME B18.6.3 specifications for dimensional standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial applications.