S-94063A540 1/4"-20 x 3/4" 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
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under heavy loads
• Rockwell B70 hardness provides excellent wear resistance and durability
• Drilled spanner drive design allows for secure installation and removal in tight spaces
• Class 2A thread fit and UNC coarse threading deliver consistent engagement and reduced cross-threading risks
• Standard 82° countersink angle enables flush mounting for a smooth, professional finish
• Full threading along the 3/4" length offers maximum grip and adjustability in various materials

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-20 UNC flat head screws address critical fastening challenges with precision and reliability. The 18-8 stainless steel construction, enhanced by a passivated finish, provides exceptional resistance to corrosion and chemical exposure, making them suitable for machinery, automotive assemblies, and outdoor equipment. The drilled spanner drive ensures tamper-resistant installation, while the coarse UNC threads and Class 2A fit facilitate quick assembly with minimal risk of stripping. This combination of material strength and design accuracy reduces maintenance needs and downtime, offering a cost-effective solution for high-stress environments where consistent performance is essential.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy with a Class 2A thread fit and standard 82° countersink angle. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for global industrial use.