S-94066A856 1/4"-20 x 1 1/4" Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for reliable, long-lasting fastening
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures secure installation and vibration resistance
• Convenient installation and removal with drilled spanner drive design, providing positive torque application without cam-out
• Maximum grip length from fully threaded design distributes load evenly across the entire fastener length
• Regulatory compliance assurance with RoHS 3 and REACH compliance for use in regulated industries and global markets
• Versatile rounded pan head profile offers low-profile installation while maintaining adequate bearing surface

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4"-20 UNC coarse thread screws provide critical solutions where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition, enhanced by passivated finish, effectively combats oxidation and chemical degradation in marine, food processing, and chemical exposure environments. The fully threaded design ensures maximum thread engagement throughout the entire 1-1/4" length, distributing clamp load evenly and preventing stress concentration. The drilled spanner drive facilitates secure installation in confined spaces where socket access is limited, while the rounded pan head provides a clean, low-profile appearance without sacrificing bearing surface area. These features combine to deliver consistent performance in machinery assembly, equipment manufacturing, and structural applications where vibration resistance and long-term integrity are essential.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit tolerances according to UNC standards, ensuring consistent engagement and proper clearances. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental compliance and material safety. The combination of 80,000 psi tensile strength and Rockwell B96 hardness provides verified mechanical performance for industrial applications requiring reliable fastening solutions.