S-91249A115 4-40 x 5/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable fastening under substantial mechanical stress
• Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
• Class 2A thread fit with 4-40 UNC coarse threading delivers consistent engagement and easy assembly
• Fully threaded design maximizes grip and load distribution across the entire fastener length
• Pan head with Phillips No. 1 drive offers secure tool engagement and a low-profile, rounded appearance
• Compliance with RoHS 3 and REACH ensures environmental safety and regulatory adherence for global supply chains

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 4-40 UNC coarse thread screws combine Black-Oxide 18-8 Stainless Steel with a pan head Phillips drive to address common fastening challenges. The material's inherent corrosion resistance and the Class 2A thread fit prevent seizing and galling, reducing maintenance in machinery, electronics, and outdoor equipment. The fully threaded design ensures uniform clamping force, critical in assemblies subject to vibration or thermal cycling. With a tensile strength of 70,000 psi, they provide reliable performance in high-stress environments, from automotive components to industrial enclosures, while the Phillips drive facilitates efficient installation with standard tools.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A fit for precise dimensional accuracy, manufactured in accordance with ASME B18.6.3 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety requirements in industrial applications.