S-90550A330 6-32 x 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 environments and long-term reliability.
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threads, reducing the risk of cross-threading and providing consistent engagement.
• Efficient installation and removal with a 5/64" hex drive, allowing for high torque application and minimizing tool slippage.
• Flush, professional finish thanks to the standard flat head with an 82° countersink angle, sitting seamlessly in prepared surfaces.
• Enhanced pressure equalization via the vented screw feature (0.038" vent diameter), preventing pressure buildup in sealed assemblies.
• Full thread engagement across the entire 1/2" length, offering maximum grip strength and load distribution in various materials.
• Compliance with rigorous industrial standards including ASME B18.3, ASTM F879, and MIL-DTL-18240, ensuring consistent quality and performance.

Professional Applications & Engineering Value

This 6-32 UNC flat head screw is engineered to address common industrial challenges such as corrosion, pressure differentials, and installation efficiency. The 18-8 stainless steel material provides excellent resistance to rust and oxidation, making it suitable for applications in marine, chemical, and outdoor equipment where environmental factors are a concern. The fully threaded design and Class 3A thread fit ensure reliable fastening in metals and plastics, reducing the need for frequent maintenance. The vented screw feature is particularly valuable in enclosed systems, allowing air or fluid pressure to equalize without compromising seal integrity. Combined with a hex drive for secure tool engagement, this screw streamlines assembly processes in aerospace, automotive, and machinery sectors, enhancing productivity and durability.

Specification Summary & Compliance

This screw adheres to precise dimensional standards with a UNC coarse thread (6-32 size) and Class 3A thread fit for tight tolerances. It meets ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmentally safe and regulated industrial use.