S-94414A371 1/4"-28 x 3/4" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP30 drive, reducing cam-out and tool wear for reliable fastening
• Exceptional tensile strength of 140,000 PSI provides high load-bearing capacity in demanding applications
• Precision Class 3A threading ensures tight, secure fits with minimal risk of cross-threading
• Enhanced corrosion resistance from black-oxide coating extends service life in harsh environments
• Optimal flush mounting with 82° countersink angle and standard flat head profile for clean installations
• Consistent performance maintained through Rockwell C39 hardness and fully threaded design
• Broad industry compliance with ASME, RoHS 3, and REACH standards simplifies procurement and qualification

Professional Applications & Engineering Value

Engineered for precision assembly in industrial machinery, automotive systems, and electronic enclosures, this black-oxide alloy steel flat head screw addresses critical challenges in high-vibration and high-stress environments. The Torx Plus drive system delivers up to 30% greater torque transfer compared to standard drives, preventing fastener failure during installation and maintenance. With fine UNF threading and Class 3A fit, it maintains clamping force under dynamic loads while the black-oxide finish resists oxidation in humid or chemically exposed settings. These features make it ideal for applications requiring repeated disassembly without compromising thread integrity or corrosion protection.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerances per UNF specifications with 1/4"-28 fine threading and full thread coverage. Manufacturing conforms to ASME B18.3 standards (ASTM F835) for dimensional consistency and mechanical properties. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) for environmental safety. The 82° countersink angle matches standard chamfered holes while the right-hand thread direction ensures compatibility with conventional assembly practices.