S-94063A542 1/4"-20 x 1" 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 and passivated finish, ideal for harsh industrial environments.
• Enhanced durability and strength from Rockwell B70 hardness and 70,000 psi tensile strength, ensuring reliable performance under heavy loads.
• Precise, secure fastening with Class 2A thread fit and UNC coarse threads, reducing the risk of loosening in vibration-prone applications.
• Efficient installation and tamper resistance thanks to the drilled spanner drive, allowing for quick assembly with specialized tools.
• Flush mounting capability with a standard 82° countersink angle and flat head design, providing a smooth surface finish.
• Full threading for maximum grip across the entire 1" length, offering consistent holding power in various materials.
• Compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 1/4"-20 UNC Flat Head Spanner Screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and the need for tamper-resistant fastening. Constructed from 18-8 Stainless Steel with a passivated finish, it provides exceptional resistance to rust and chemicals, making it suitable for outdoor, marine, and chemical processing equipment. The drilled spanner drive ensures secure installation in confined spaces, while the coarse UNC threads and Class 2A fit deliver reliable engagement in metals and plastics, reducing maintenance needs. Ideal for machinery, automotive assemblies, and electronic enclosures, this screw combines high tensile strength and full threading to prevent joint failure, enhancing operational safety and longevity in demanding industrial applications.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a head diameter of 0.477" with a tolerance of -0.025" to 0.03", and features UNC coarse threads with a Class 2A thread fit for consistent performance. It meets ASME B18.6.3 specifications for mechanical and dimensional standards, ensuring interchangeability and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations without hazardous substances.