S-90550A220 4-40 x 5/16" 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, ideal for harsh industrial environments.
- Precise, reliable fastening ensured by Class 3A thread fit and UNC coarse thread for excellent grip and vibration resistance.
- Efficient installation and removal with a 1/16" hex drive, providing a secure tool grip and reducing stripping risks.
- Flush, professional finish achieved with a standard flat head and 82° countersink angle for seamless surface integration.
- Enhanced pressure equalization via the vented feature with a 0.035" vent diameter, preventing pressure buildup in sealed assemblies.
- Maximum holding power from the fully threaded design, distributing load evenly along the entire 5/16" length.
- Guaranteed quality and safety through compliance with RoHS 3 and REACH, meeting strict environmental and health standards.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC flat head screws in 18-8 Stainless Steel deliver exceptional durability and reliability. The hex drive design ensures secure torque application, minimizing cam-out in high-stress environments like machinery, electronics, and aerospace assemblies. With a fully threaded right-hand thread and coarse thread spacing, they provide rapid installation and robust resistance to loosening under vibration. The vented feature is critical for applications requiring pressure relief, such as in enclosures or fluid systems, preventing damage from trapped air or gases. Compliant with ASME B18.3, ASTM F879, and MIL-DTL-18240, these screws offer a trusted solution for precision fastening where material integrity and regulatory adherence are paramount.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC thread type with coarse spacing. It meets ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications for quality assurance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety, free from hazardous substances.
