S-99926A149 5/16"-18 x 1 1/4" Stainless Steel Hex Drive Flat Head Screws
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 and passivated finish for extended service life in harsh environments
- Exceptional mechanical strength delivering 70,000 PSI tensile strength and Rockwell B70 hardness for reliable, high-stress applications
- Precise Class 3A thread fit ensures secure engagement and vibration resistance in critical assemblies
- Optimized hex drive design (5/32") provides superior torque transmission and reduces tool slippage during installation
- Undercut flat head profile enables flush mounting while maintaining structural integrity under surface loads
- Coarse UNC threading facilitates rapid installation and superior performance in softer materials
- Full regulatory compliance with RoHS 3 and REACH standards for global industrial deployment
Professional Applications & Engineering Value
This 5/16"-18 UNC flat head screw delivers critical engineering advantages through its specialized material and design properties. The 18-8 stainless steel composition with passivated finish provides exceptional resistance to oxidation and chemical exposure, making it ideal for marine, food processing, and outdoor equipment applications. The hex drive configuration combined with coarse threading ensures rapid, secure installation in production environments while minimizing cross-threading risks. The undercut flat head design allows for complete flush mounting in countersunk applications, eliminating protrusions that could interfere with moving components. With partial threading and precise Class 3A thread fit, this fastener maintains clamping force integrity in vibration-prone assemblies, from machinery frames to structural supports.
Specification Summary & Compliance
Manufactured to exacting dimensional standards with Class 3A thread fit tolerance and UNC coarse thread specification (5/16"-18). Features include 1-1/4" length with 1.07" minimum thread engagement, 100° countersink angle, and Rockwell B70 hardness rating. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring stringent material restrictions.
