S-92949A110 4-40 x 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
• High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding applications
• Rockwell B55 hardness maintains thread integrity and prevents stripping during installation
• Hex drive design allows for secure tool engagement and efficient installation in confined spaces
• Full threading delivers maximum grip length and uniform stress distribution
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees quality consistency and environmental safety

Professional Applications & Engineering Value

These 4-40 UNC threaded rounded head screws deliver exceptional performance in precision assemblies where reliability is paramount. The 18-8 stainless steel material combined with passivated finish provides outstanding resistance to oxidation and chemical exposure, making them ideal for electronics enclosures, medical devices, and marine equipment. The Class 3A thread fit with coarse thread spacing ensures rapid installation while maintaining tight tolerances, reducing the risk of cross-threading in high-volume production. The button head style with hex drive offers a low-profile solution that withstands high torque applications without compromising aesthetic requirements in consumer-facing products.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNC coarse thread profile. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Standard right-hand thread direction with fully threaded design ensures consistent performance across industrial applications.