S-90550A760 1/4"-20 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 fastening reliability through Class 3A thread fit and coarse UNC threading, ensuring secure, vibration-resistant connections.
• Efficient installation and removal with a 5/32" hex drive, allowing for quick assembly using standard tools without slipping.
• Optimal flush mounting thanks to the standard flat head profile and 82° countersink angle, providing a smooth, unobtrusive finish.
• Prevented pressure buildup via the fully threaded vented design with 0.062" vent diameter, crucial for sealed or pressurized systems.
• Long-term durability backed by compliance with ASME B18.3, ASTM F879, and MIL-DTL-18240 standards, ensuring consistent performance.
• Environmentally safe usage with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This 1/4"-20 UNC Flat Head Screw is engineered to address common industrial challenges, such as corrosion and assembly inefficiencies. Made from 18-8 Stainless Steel, it offers excellent resistance to rust and chemical exposure, making it suitable for applications in marine, automotive, and food processing industries. The fully threaded and vented design prevents air or fluid pressure entrapment, which is critical in enclosed systems like HVAC units or machinery housings. With a right-hand thread and coarse thread spacing, it ensures quick, secure fastening even in high-vibration environments. The hex drive and precise dimensions enable easy installation, reducing labor time and improving project timelines for B2B clients seeking reliable, compliant fasteners.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC threading with a 1/4"-20 size. It meets ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring manufacturing consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it is free from restricted substances, supporting safe and sustainable industrial use.