S-90550A920 3/8"-16 x 1" 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 extended service life.
• Precise and reliable fastening ensured by the Class 3A thread fit, providing tighter tolerances for high-vibration applications.
• Efficient installation and removal with a hex drive (7/32"), allowing for high torque application without slippage.
• Optimal flush mounting with a standard flat head and 82° countersink angle, creating a smooth, secure surface finish.
• Enhanced pressure equalization via the vented screw feature (0.093" vent diameter), preventing pressure buildup in sealed assemblies.
• Full-length threading for maximum grip and load distribution along the entire 1" length, increasing joint integrity.
• Broad industry compliance meeting ASME B18.3, ASTM F879, and MIL-DTL-18240 standards, ensuring quality and interoperability.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to address critical challenges in industrial fastening. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for demanding environments like marine, chemical processing, and outdoor machinery. The Class 3A thread fit and coarse UNC thread provide superior holding power in high-vibration settings, reducing the risk of loosening over time. The vented screw design is particularly valuable in applications requiring pressure relief, such as in hydraulic systems or enclosed electronic housings, preventing seal failure. Combined with a hex drive for secure tool engagement, this fully threaded fastener delivers consistent performance in assembly lines, aerospace components, and heavy equipment where reliability is paramount.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with a Class 3A fit for high precision, ensuring tight dimensional accuracy. It is manufactured in compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, guaranteeing consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for global industrial use.