S-94063A322 1/4"-20 x 5/8" 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, ideal for harsh environments.
• High tensile strength of 70,000 psi ensures reliable performance in demanding mechanical assemblies.
• Drilled spanner drive design provides secure tool engagement and reduces the risk of stripping during installation.
• Class 2A thread fit and UNC coarse threading enable quick, easy assembly and consistent fastening.
• Flat head with standard 82° countersink allows for a flush, unobtrusive finish in countersunk applications.
• Full compliance with ASME B18.6.3 guarantees dimensional accuracy and interchangeability.
• RoHS 3 and REACH compliant for safe use in regulated industries and global markets.

Professional Applications & Engineering Value

This 1/4"-20 x 5/8" 18-8 stainless steel flat head spanner screw is engineered to address critical challenges in industrial and mechanical assemblies. The combination of 18-8 stainless steel and a passivated finish offers exceptional resistance to corrosion and oxidation, making it suitable for applications in marine, chemical processing, and outdoor equipment where environmental factors are a concern. The drilled spanner drive ensures high torque transmission without cam-out, reducing installation time and tool wear. With UNC coarse threads and a Class 2A thread fit, it provides reliable engagement in a variety of materials, from metals to plastics, minimizing cross-threading risks. Its flat head design with an 82° countersink angle allows for seamless integration into surfaces, maintaining aerodynamic and aesthetic profiles in machinery, automotive, and aerospace components. This screw delivers durability, ease of use, and compliance with rigorous industry standards, enhancing the longevity and reliability of your assemblies.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent performance and UNC coarse threading (1/4"-20) per standard inch system requirements. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring reliability and interchangeability. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global industrial use.