S-91870A260 1/4"-20 x 2 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced Security: Tamper-resistant T30 Torx drive prevents unauthorized removal, ideal for public or high-security installations.
• Superior Corrosion Resistance: 18-8 stainless steel with passivated finish ensures long-term durability in harsh environments, reducing maintenance costs.
• High Mechanical Strength: 70,000 psi tensile strength and Rockwell B70 hardness provide reliable performance under heavy loads and stress.
• Secure Fastening: Fully threaded UNC coarse design with Class 2A fit offers consistent grip and vibration resistance in various materials.
• Streamlined Installation: Standard 82° flat head profile allows for flush mounting, minimizing protrusion and improving aesthetics.
• Broad Compliance: Meets ASME B18.3 standards and RoHS/REACH regulations, ensuring quality and environmental safety for global projects.
• Versatile Application: Right-hand thread and 2-1/2" length suit a range of industrial assemblies requiring robust, tamper-proof fastening.

Professional Applications & Engineering Value

This 1/4"-20 x 2-1/2" flat head screw is engineered to address critical challenges in industrial and security-focused settings. Constructed from 18-8 stainless steel with a passivated finish, it combats corrosion in moist or chemical-exposed environments, extending service life and reducing replacement frequency. The tamper-resistant T30 Torx drive deters vandalism and unauthorized access, making it ideal for public infrastructure, machinery enclosures, and electronic housings. With UNC coarse threading and full threading, it ensures quick, secure installation in wood, metal, or plastic, while the flat head design provides a smooth surface to prevent snagging. By integrating high tensile strength and hardness, this fastener supports heavy-duty applications, from manufacturing equipment to transportation systems, delivering reliability where failure is not an option.

Specification Summary & Compliance

This screw features precise Class 2A thread fit for consistent engagement and UNC 1/4"-20 coarse threads that resist loosening under vibration. It adheres to ASME B18.3 manufacturing specifications, ensuring dimensional accuracy and performance reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe use in various industries.