S-94414A112 4-40 x 3/4" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coating on Alloy Steel, extending service life in demanding industrial environments
• Exceptional torque transmission through Torx Plus IP10 drive, minimizing cam-out and tool wear during high-torque applications
• High mechanical strength with 140,000 psi tensile strength and Rockwell C39 hardness for reliable performance under heavy loads
• Precise flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
• Consistent thread engagement through Class 3A thread fit and UNC coarse threading, ensuring vibration resistance in critical assemblies
• Full threading versatility along the entire 3/4" length for maximum adjustment flexibility in various material thicknesses
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 4-40 UNC flat head screws deliver critical engineering solutions where surface flushness and high-strength fastening are paramount. The Black-Oxide Alloy Steel construction provides enhanced corrosion protection for machinery, automotive, and electronic enclosures exposed to harsh operating conditions. The Torx Plus IP10 drive system addresses common installation challenges by eliminating cam-out issues, enabling higher torque application without damaging the drive recess. With fully threaded design and Class 3A thread fit, these screws maintain consistent clamping force in vibration-prone assemblies, while the standardized 82° countersink ensures perfect flush mounting in precision equipment and structural components where protrusion is unacceptable.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance in inch system applications. The UNC coarse threading (4-40) provides optimal engagement in various materials. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global markets. The mechanical properties exceed industrial requirements with 140,000 psi tensile strength and Rockwell C39 hardness certification.