S-90550A930 3/8"-16 x 1 1/4" 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 outdoor applications.
• Enhanced installation security provided by the 7/32" hex drive, preventing cam-out and ensuring a tight, reliable fit.
• Precise thread engagement with Class 3A fit and UNC coarse threads, offering excellent vibration resistance and faster assembly.
• Optimized flush mounting due to the standard flat head with an 82° countersink angle, creating a smooth, finished surface.
• Prevents pressure buildup with the integrated vent feature (0.093" diameter), crucial for applications requiring pressure equalization.
• Maximum holding power from the 1-1/4" length and fully threaded design, ensuring strong fastening across the entire shank.
• Guaranteed reliability and interchangeability by complying with ASME B18.3, ASTM F879, and MIL-DTL-18240 standards.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to solve critical challenges in industrial assembly and machinery. Its 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for demanding environments like chemical processing, marine equipment, and food machinery. The hex drive design ensures high torque application without stripping, while the Class 3A thread fit with coarse UNC threads delivers superior vibration resistance, reducing maintenance needs in dynamic systems. The vented feature is particularly valuable in pressurized systems or sealed enclosures, preventing vacuum lock or moisture entrapment. This combination of a flat head profile and robust stainless steel construction ensures reliable performance in aerospace, military (MIL-DTL-18240), and general engineering applications where precision and durability are non-negotiable.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC thread with a Class 3A fit for high precision and a coarse thread spacing suitable for most industrial uses. It is manufactured to meet ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and performance reliability. 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 various international markets.