S-91870A618 1/4"-20 x 3/4" 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 specialized T30 Torx drive prevents unauthorized access in security-sensitive environments
- Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life in harsh conditions
- Precision thread engagement with Class 3A fit and UNC coarse spacing ensures reliable fastening and vibration resistance
- Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
- Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
- Full-thread design provides maximum grip length and load distribution across the entire fastener
- Regulatory compliance meets ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for critical security applications where tamper-resistant fastening is paramount, these 18-8 stainless steel flat head screws provide reliable protection against unauthorized access in public infrastructure, electrical enclosures, and industrial machinery. The passivated finish significantly enhances corrosion resistance in challenging environments, while the T30 Torx drive system maintains installation integrity under high torque requirements. The Class 3A thread fit with UNC coarse spacing ensures rapid assembly and superior vibration resistance, making these fully threaded security screws ideal for permanent installations requiring both maximum holding power and environmental compliance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing (1/4"-20), ensuring optimal engagement and mechanical performance. Complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. Features 82° countersink angle per industry standards for proper flush mounting applications.
