S-91870A761 5/16"-18 x 2 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless Steel Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Enhanced tamper resistance with T40 Torx drive prevents unauthorized removal in high-security environments
- Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
- Maximum load-bearing capacity with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Precision thread engagement with Class 3A fit and UNC coarse spacing ensures reliable fastening in demanding conditions
- Full-length threading provides complete engagement along the entire 2-1/2" length for superior holding power
- Standard 82° countersink angle enables flush mounting in various materials and applications
- Regulatory compliance meets ASME B18.3 specifications and environmental standards including RoHS and REACH
Professional Applications & Engineering Value
This 5/16"-18 flat head screw with tamper-resistant T40 Torx drive addresses critical security and durability challenges in industrial settings. The 18-8 stainless steel composition, enhanced by passivated finish, provides exceptional resistance to corrosion and chemical exposure, making it ideal for harsh environments including outdoor installations, marine applications, and chemical processing facilities. The fully threaded design with UNC coarse spacing and Class 3A thread fit ensures maximum thread engagement and vibration resistance in machinery, security systems, and structural assemblies. The 82° countersink angle allows for clean, flush installations while maintaining structural integrity under heavy loads, delivering reliable performance where security and durability are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with Class 3A thread fit precision and UNC coarse thread specifications. Features include 5/16"-18 thread size, 2-1/2" length, and T40 tamper-resistant Torx drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications while maintaining 70,000 psi tensile strength and Rockwell B70 hardness specifications.
