S-91418A550 1/4"-20 x 2" ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional hardness and durability with Rockwell C45 rating, preventing deformation under high torque applications
• Secure fastening with extended tip design providing deeper engagement and reduced loosening in dynamic assemblies
• Precise Class 2A thread fit ensuring smooth installation and reliable performance in coarse UNC threading
• Easy installation and removal with external square drive design, compatible with standard tools for efficient maintenance
• Compliance with international standards including ASTM F912, RoHS 3, and REACH for global project compatibility
• Optimized for heavy-duty applications with alloy steel construction maintaining integrity under sustained mechanical stress

Professional Applications & Engineering Value

This black-oxide alloy steel set screw addresses critical industrial fastening challenges where vibration resistance and long-term reliability are paramount. The extended tip design creates deeper seating in components, significantly reducing the risk of loosening in machinery, automotive assemblies, and power transmission systems. Manufactured from high-strength alloy steel with Rockwell C45 hardness, it maintains structural integrity under extreme torque and repetitive stress cycles. The coarse UNC 1/4"-20 threading combined with Class 2A tolerance ensures quick installation while providing secure fastening in various materials. The external square drive offers superior torque transmission compared to standard drives, making it ideal for high-vibration environments where fastener security is critical to operational safety and equipment longevity.

Specification Summary & Compliance

This set screw features precise Class 2A thread fit with UNC 1/4"-20 coarse threading and right-hand thread direction. Manufacturing complies with ASTM F912 specifications for dimensional accuracy and performance standards. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental regulations for hazardous substances. Critical dimensions include 2" length, 1/4" head width, and extended tip with diameter of 0.156" and length tolerance of -0.005" to 0.005".