S-91900A550 1/4"-20 x 1 3/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws
Tamper-Resistant Torx Stainless Steel Button 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 Security: Tamper-resistant T27 drive prevents unauthorized removal, ideal for public or sensitive equipment.
- Superior Corrosion Resistance: 18-8 Stainless Steel with passivated finish ensures long-term durability in harsh environments.
- High Mechanical Strength: 70,000 psi tensile strength and Rockwell B70 hardness provide reliable performance under heavy loads.
- Precise & Secure Fastening: Class 3A thread fit and UNC coarse threads offer excellent engagement and vibration resistance.
- Streamlined Profile: Rounded button head design reduces snagging and provides a finished appearance.
- Full Thread Engagement: Fully threaded 1-3/4" length maximizes grip and holding power in various material thicknesses.
- Regulatory Assurance: Compliant with ASME B18.3, RoHS 3, and REACH for safe, standardized use in regulated industries.
Professional Applications & Engineering Value
This 1/4"-20 x 1-3/4" tamper-resistant screw is engineered to solve critical challenges in industrial security and durability. Its 18-8 Stainless Steel construction and passivated finish combat corrosion in demanding environments like outdoor machinery, chemical processing, and marine applications. The Tamper-Resistant Torx (T27) drive is a key feature for public infrastructure, electronic enclosures, and access panels, deterring vandalism and unauthorized access. The UNC coarse threads and Class 3A fit ensure quick assembly and a secure, vibration-resistant connection in metals and plastics. The rounded button head minimizes protrusion, reducing the risk of injury or catching on equipment, making it a versatile and reliable security fastener for OEMs and maintenance teams.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with a Class 3A fit for precision and strength. It is fully threaded and has a right-hand thread direction with coarse spacing. Manufacturing and dimensional specifications conform to ASME B18.3. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.
