S-90434A174 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior plastic fastening performance with TRS thread forming design that creates strong, permanent threads without chips
• Enhanced corrosion resistance through Black Oxide Steel finish, extending service life in various environments
• Secure flush mounting with 82° countersink angle and flat head design that sits perfectly flush with material surfaces
• Exceptional torque resistance thanks to the Tri-Lobe shank cross-section that prevents rotation after installation
• Reliable drive engagement with Phillips No. 1 drive style for consistent installation and reduced cam-out
• Full-length threading provides maximum thread engagement and superior holding power across the entire fastener length
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial use

Professional Applications & Engineering Value

These No. 4 x 3/4" TRS Black Oxide Steel tapping screws are specifically engineered for demanding plastic fastening applications where reliability and vibration resistance are critical. The thread forming TRS design eliminates the risk of material cracking common with thread cutting alternatives, making them ideal for brittle plastics and thin-walled components. The Tri-Lobe shank cross-section provides exceptional anti-rotation properties, ensuring the fastener remains securely in place even under constant vibration or thermal cycling. With a 0.112" thread diameter and 20 TPI thread pitch, these screws deliver optimal thread engagement while minimizing stress concentration in plastic materials. The 82° countersink angle combined with the flat head profile creates a clean, flush finish that meets aesthetic requirements while providing structural integrity.

Specification Summary & Compliance

These inch system tapping screws feature a No. 4 screw size with 3/4" length and are fully threaded with right-hand direction. The thread forming (TRS) tapping method requires a No. 37 drill bit (0.104" diameter) for proper installation. Manufactured to precise dimensional standards with Class 2A thread fit for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet the latest industrial safety and sustainability requirements.