S-90550A450 8-32 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 environments and long-term reliability.
• Precise and secure fastening thanks to the Class 3A thread fit, ensuring tight tolerances and reduced risk of loosening under vibration.
• Efficient installation and removal with the 3/32" hex drive, providing a positive grip for high-torque applications.
• Flush, clean finish achieved with the standard flat head and 82° countersink angle, perfect for applications where a smooth surface is critical.
• Prevents pressure buildup via the integrated vented design with a 0.042" vent diameter, essential in sealed or pneumatic systems.
• Maximum thread engagement from being fully threaded, offering consistent holding power along the entire 1" length.
• Guaranteed quality and interchangeability by conforming to ASME B18.3, ASTM F879, and MIL-DTL-18240 standards.

Professional Applications & Engineering Value

This 8-32 UNC flat head screw is engineered to solve critical fastening challenges in demanding industrial applications. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for outdoor equipment, marine hardware, and chemical processing environments where durability is non-negotiable. Its Class 3A thread fit and coarse thread spacing ensure rapid assembly and a reliable, vibration-resistant connection, reducing maintenance needs. The vented feature is particularly valuable in applications involving pressure differentials, such as in enclosures or fluid systems, preventing seal failure. Combined with the 82° countersink angle and 3/32" hex drive, it allows for a secure, flush mount that withstands high stress, making it a top choice for machinery, aerospace components, and precision assemblies.

Specification Summary & Compliance

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