S-94063A546 1/4"-20 x 1 1/2" ASME B18.6.3 Tamper-Resistant Drilled Spanner Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for dependable load-bearing in demanding applications.
• Precision thread fit with Class 2A UNC coarse threads providing secure, vibration-resistant fastening and easy installation.
• Flush mounting capability due to the standard 82° countersink angle and flat head design, ideal for sleek, unobtrusive assemblies.
• Secure tamper-resistant drive featuring a drilled spanner style, enhancing safety in public or high-security settings.
• Full threading along the 1 1/2" length ensures maximum grip and uniform stress distribution for consistent performance.
• Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing safety and regulatory adherence.

Professional Applications & Engineering Value

This 1/4-20 UNC flat head screw is engineered to address critical industrial fastening challenges, such as vibration loosening and corrosion-induced failure. Crafted from 18-8 stainless steel with a passivated finish, it excels in environments exposed to moisture, chemicals, or outdoor elements, reducing maintenance needs and downtime. The coarse UNC threads and Class 2A fit provide excellent holding power in materials like metal or hardwood, common in machinery, automotive, and construction assemblies. The drilled spanner drive adds tamper resistance, making it suitable for public infrastructure or security-sensitive applications. By integrating high tensile strength and full threading, this screw ensures reliable, long-term performance in industrial fastening solutions, from equipment frames to structural components.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and a head diameter tolerance of -0.025" to 0.03". It conforms to ASME B18.6.3 specifications for flat head screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The screw features a standard 82° countersink angle and right-hand UNC coarse threads, designed for reliable performance in various industrial settings.