S-90909A217 1/2"-13 x 2 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws
Stainless Steel Flanged Button Head Hex-Drive 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 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty load-bearing applications
- Precision thread engagement through Class 3A thread fit and UNC coarse threading ensuring reliable fastening in high-vibration settings
- Efficient installation with 5/16" hex drive and flanged design eliminating the need for separate washers
- Full-threaded coverage along the 2 1/2" length providing maximum grip and adjustment flexibility
- Regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries
- Wide-bearing surface from the rounded button head design distributing clamp force evenly
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this 316 stainless steel rounded head screw delivers critical performance where corrosion resistance and structural integrity are paramount. The combination of UNC coarse threading and Class 3A thread fit ensures rapid assembly with minimal cross-threading risk, while the passivated finish enhances surface durability against chemical exposure. The integrated flange design provides superior load distribution without requiring additional components, making these fully threaded screws ideal for chemical processing equipment, marine hardware, and food processing machinery where frequent washdowns and aggressive media are present. The 5/16" hex drive accommodates standard tools for efficient maintenance and installation in confined spaces.
Specification Summary & Compliance
This fastener maintains precision Class 3A thread tolerances per UNC standards with coarse thread spacing (1/2"-13) and right-hand threading. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance. The fully threaded construction and flanged screw features provide consistent performance across the entire 2 1/2" length with a flange diameter of 1.156".
