S-90550A120 2-56 x 1/4" ASME B18.3, ASTM F879, MIL-DTL-18240 Venting Stainless Steel Hex-Drive Flat Head Screws
Venting Stainless Steel Hex-Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 Stainless Steel construction, ensuring long-term reliability in harsh environments
- Precise Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening
- Vented screw design allows pressure equalization, preventing fluid or gas buildup in sensitive applications
- 82° countersink angle provides a flush, professional finish while distributing clamping force evenly
- Hex drive (0.050") enables high-torque installation and removal with standard tools, minimizing stripping
- Fully threaded shank maximizes grip and load distribution across the entire engagement length
- Compliance with major industry standards including ASME B18.3, ASTM F879, and MIL-DTL-18240 for guaranteed interoperability
Professional Applications & Engineering Value
This 2-56 UNC flat head screw is engineered to address critical challenges in precision assembly and corrosive environments. The 18-8 Stainless Steel material provides excellent resistance to oxidation and chemical exposure, making it ideal for electronics enclosures, instrumentation, and aerospace components where reliability is non-negotiable. The vented screw feature is particularly valuable in sealed systems, preventing pressure differentials that could compromise integrity. With its coarse UNC threads and Class 3A fit, it ensures rapid installation and high clamping force without cross-threading risks. The hex drive design supports automated assembly processes, reducing installation time and improving consistency in high-volume production lines.
Specification Summary & Compliance
This screw maintains Class 3A thread tolerances per UNC standards, with a 2-56 thread size and 1/4" length. Manufacturing adheres to ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications, ensuring dimensional accuracy and mechanical performance. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for global industrial use.
