S-91870A773 1/4"-20 x 2" ASME B18.3 Tamper-Resistant Torx Steel Flat Head Screws
Tamper-Resistant Torx 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
- Maximum tamper resistance with T30 Torx drive design, preventing unauthorized access in secure applications
- Superior corrosion protection through black oxide finish, extending service life in harsh environments
- Exceptional mechanical strength with 160,000 psi tensile rating and Rockwell C38 hardness for heavy-duty applications
- Precise thread engagement with Class 3A fit and UNC coarse threading for reliable, vibration-resistant connections
- Full-length threading provides maximum grip along the entire 2" shaft length for enhanced load distribution
- Standard 82° countersink angle ensures flush mounting and clean aesthetic finish
- Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for quality assurance and environmental safety
Professional Applications & Engineering Value
These flat head screws with tamper-resistant Torx drive address critical security and reliability challenges in industrial settings. The alloy steel construction combined with black oxide finish provides excellent corrosion resistance for outdoor equipment, machinery, and electronic enclosures exposed to moisture and chemicals. The Class 3A thread fit and UNC coarse threading ensure secure fastening in vibration-prone applications while the fully threaded design maximizes holding power in assemblies requiring uniform stress distribution. Ideal for security panels, access control systems, and industrial machinery where tamper-proof fastening and environmental durability are paramount.
Specification Summary & Compliance
This fastener maintains precision Class 3A thread tolerances with UNC coarse threading (1/4"-20) and right-hand thread direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substances. The 82° flat head profile conforms to standard countersink requirements for seamless integration.
