S-91870A310 5/16"-18 x 1 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless Steel 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
- Enhanced tamper resistance with Torx T40 drive prevents unauthorized access in security-sensitive environments
- Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
- Reliable thread engagement with full UNC coarse threading and Class 2A fit ensures secure fastening
- Optimized flush mounting with standard 82° countersink angle for smooth surface finishing
- Exceptional mechanical strength delivering 70,000 psi tensile strength for heavy-duty applications
- Consistent performance maintained through Rockwell B70 hardness and precise manufacturing
- Broad compatibility with standard UNC thread specifications and industrial equipment
Professional Applications & Engineering Value
This 18-8 stainless steel flat head screw with tamper-resistant Torx T40 drive addresses critical security and durability challenges in industrial settings. The passivated finish significantly enhances corrosion resistance, making it ideal for harsh environments where moisture or chemicals are present. The fully threaded UNC coarse thread design provides maximum grip strength and vibration resistance, while the 82° countersink angle ensures flush installation for safety and aesthetics. These flat head screws are engineered for applications requiring both security and reliability, including machinery enclosures, public infrastructure, and electronic assemblies where tampering prevention and long-term performance are paramount.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18) and right-hand thread direction. This fastener meets ASME B18.3 specifications for dimensional accuracy and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industrial applications. The screw features standard inch measurements with 1-1/2" length and 0.656" head diameter, manufactured according to industry-standard specifications for consistent quality and reliability.
