S-90550A850 5/16"-18 x 1 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 for long-lasting performance in harsh environments
- Precise Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
- Vented design allows pressure equalization and prevents fluid/air lock in specialized applications
- 82° countersink angle provides flush mounting for clean, professional finishes
- 3/16" hex drive delivers superior torque transmission and prevents cam-out during installation
- Fully threaded shank maximizes grip length and load distribution across the entire fastener
- Compliance with multiple standards guarantees consistent quality and reliability across industrial applications
Professional Applications & Engineering Value
This 18-8 stainless steel flat head screw addresses critical engineering challenges in demanding environments where corrosion resistance and pressure management are paramount. The vented design specifically solves issues of pressure differentials and fluid entrapment in sealed assemblies, making it ideal for aerospace, marine, and precision equipment applications. The 5/16"-18 UNC coarse thread provides excellent engagement in various materials while the Class 3A thread fit ensures precise, reliable connections that withstand vibration and dynamic loads. The 82° countersink angle and flat head profile create seamless surface finishes while the hex drive configuration prevents stripping during high-torque installations.
Specification Summary & Compliance
This industrial fastener features 5/16"-18 UNC coarse threads with Class 3A precision fit and 1-1/4" fully threaded length. Manufactured to exacting standards including ASME B18.3, ASTM F879, and MIL-DTL-18240 specifications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial applications.
