S-94414A321 4-40 x 3/16" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission and reduced cam-out with the Torx Plus IP10 drive, ensuring reliable fastening in high-stress applications.
• Exceptional tensile strength of 140,000 psi provides high load-bearing capacity and resistance to mechanical failure in demanding environments.
• Enhanced corrosion resistance from the black-oxide finish on alloy steel, extending service life in various industrial conditions.
• Precise Class 3A thread fit ensures tight, secure connections with minimal risk of loosening or cross-threading during assembly.
• Efficient flush mounting with the standard 82° flat head profile, ideal for applications requiring a smooth surface finish.
• Full threading and coarse UNC spacing enable quick installation and strong holding power in coarse-grained materials.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to strict quality, safety, and environmental standards for global use.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered from black-oxide alloy steel to address common industrial challenges such as vibration-induced loosening and corrosion in machinery, electronics, and automotive assemblies. The Torx Plus drive system minimizes tool slippage, enhancing operator safety and efficiency during high-torque applications. With a Rockwell C39 hardness and fully threaded design, they provide consistent clamping force and durability in coarse thread setups, making them ideal for securing components where reliability and compliance with ASME B18.3 standards are critical. This combination ensures reduced maintenance and longer service intervals in professional environments.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, ensuring dimensional accuracy for secure fastening. Manufactured in accordance with ASME B18.3 specifications, it includes a right-hand thread direction, 82° countersink angle, and inch system measurements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.