S-90550A940 3/8"-16 x 1 1/2" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing long-term replacement costs.
• Precise and secure fastening ensured by the Class 3A thread fit, providing excellent vibration resistance and reliable assembly integrity.
• Efficient installation and removal with the 7/32" hex drive, allowing for high-torque application without cam-out and speeding up assembly processes.
• Optimal flush seating due to the 82° countersink angle and standard flat head profile, creating a smooth, aerodynamic surface and preventing snagging.
• Enhanced pressure equalization via the integrated 0.093" vent diameter, which helps prevent pressure buildup and potential component damage.
• Full-length threading for maximum grip and holding power along the entire 1-1/2" length, ensuring a strong, uniform clamp force.
• Guaranteed reliability and interchangeability as it meets ASME B18.3, ASTM F879, and MIL-DTL-18240 standards, ensuring consistent quality and performance.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to address critical challenges in demanding industrial settings. The 18-8 Stainless Steel material provides exceptional resistance to corrosion and oxidation, making it suitable for applications in marine, chemical processing, and outdoor equipment where environmental factors degrade lesser fasteners. The fully threaded design and Class 3A thread fit deliver superior clamping force and vibration resistance, preventing loosening in high-stress assemblies like machinery, automotive components, and structural frameworks. The vented feature with a 0.093" diameter is crucial for pressure-sensitive environments, allowing air or fluid escape to avoid seal failure or housing damage. Combined with the hex drive for secure tool engagement, this screw ensures efficient installation and long-term reliability, reducing maintenance downtime and enhancing operational safety in industrial fastening applications.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with a Class 3A thread fit for high precision and strength. It is manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 standards, ensuring dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for use in various industrial and commercial applications.