S-92210A411 4-40 x 1 1/8" ASME B18.3 Stainless Steel Hex Drive 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.
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity and durability in demanding applications.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening with minimal risk of loosening.
• Full threading and coarse UNC spacing provide faster installation and stronger holding power in various materials.
• Hex drive design (1/16") allows for high-torque application and easy installation in confined spaces.
• 82° countersink angle and flat head profile enable flush mounting for a smooth, professional finish.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures industry-standard quality and environmental safety.

Professional Applications & Engineering Value

This 4-40 UNC flat head screw is engineered to address common industrial challenges such as corrosion, vibration, and assembly efficiency. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making it suitable for industrial applications in machinery, electronics, and outdoor equipment. The Class 3A thread fit and coarse thread spacing ensure tight, reliable connections that withstand dynamic loads and reduce the risk of thread stripping. With a hex drive and fully threaded design, it offers quick, secure installation, minimizing downtime in production lines. Ideal for use where flush mounting is required, this screw delivers consistent performance in automotive, aerospace, and manufacturing sectors.

Specification Summary & Compliance

This product adheres to ASME B18.3 specifications, with precise Class 3A thread fit and UNC coarse thread spacing for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards. The screw features a right-hand thread, 82° countersink angle, and is manufactured to maintain Rockwell B55 hardness and 70,000 psi tensile strength for reliable performance in professional settings.