S-92949A814 4-40 x 1 3/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
• Superior tensile strength rated at 70,000 psi for reliable load-bearing in demanding applications
• Precise Class 3A thread fit ensures secure fastening and vibration resistance in assemblies
• Hex drive compatibility (1/16") allows for efficient installation with standard tools
• Fully threaded design provides maximum grip and uniform stress distribution
• Compliant with ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety
• Durable Rockwell B55 hardness maintains thread integrity under repeated use

Professional Applications & Engineering Value

These 4-40 UNC thread rounded head screws are engineered to address critical challenges in precision assemblies where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel construction, enhanced by a passivated finish, provides long-term protection against oxidation and chemical exposure, making them suitable for electronics, machinery, and outdoor equipment. With a coarse thread spacing and Class 3A thread fit, they ensure rapid installation and minimal loosening in high-vibration settings. The fully threaded 1-3/4" length and button head style offer a low-profile, secure fastening solution that distributes clamping force evenly, reducing the risk of joint failure in industrial and automotive applications.

Specification Summary & Compliance

These screws feature a 4-40 UNC thread with Class 3A precision fit and coarse spacing, manufactured to ASME B18.3 specifications. They comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence. Dimensions include a head diameter of 0.213", head height of 0.059", and a right-hand thread direction for consistent performance.