S-90275A350 5-40 x 3/8" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 zinc plating for extended service life in demanding industrial environments
- Enhanced durability and wear resistance from Rockwell B70 hardness, reducing fastener failure risks
- Reliable coarse threading (UNC) provides faster installation and better performance in softer materials
- Precise Class 2A thread fit ensures consistent engagement and reduces cross-threading during assembly
- Fully threaded design offers maximum grip and holding power across the entire 3/8" length
- Standard 82° countersink angle enables flush mounting for clean, professional finishes
- Slotted drive compatibility allows for quick installation with common hand tools
Professional Applications & Engineering Value
These 5-40 UNC flat head screws deliver exceptional engineering value in industrial fastening applications where reliability and compliance are critical. The zinc-plated steel construction provides essential corrosion protection for machinery, electrical enclosures, and automotive components exposed to harsh conditions. The coarse thread design ensures secure fastening in both metal and plastic substrates, while the fully threaded configuration maximizes pull-out resistance. The 82° countersink angle and flat head profile create seamless surface finishes, making them ideal for applications requiring aerodynamic surfaces or where protruding fasteners could interfere with operation. These screws solve common industrial challenges including vibration-induced loosening, material compatibility issues, and regulatory compliance requirements.
Specification Summary & Compliance
This flat head screw features precise Class 2A thread fit per UNC standards with 5-40 thread size and 3/8" length in the inch measurement system. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets stringent environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards, ensuring safe use across various industrial sectors without hazardous substance restrictions.
