S-90201A646 3/4"-10 x 2 3/4" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
• High hardness rating (Rockwell C38) provides excellent wear resistance and durability under repetitive loads.
• Coarse UNC threads offer faster installation and better grip in softer materials or where vibration is a concern.
• Partial threading design maximizes clamping force and prevents loosening in critical assemblies.
• Class 2A thread fit ensures smooth, precise engagement with standard nuts for consistent assembly quality.
• Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory acceptance in global markets.

Professional Applications & Engineering Value

This Grade 9 hex head screw is engineered to address common industrial challenges such as joint integrity under dynamic loads and exposure to corrosive elements. The steel material combined with zinc yellow-chromate plating provides a robust barrier against rust, making it ideal for outdoor machinery, construction equipment, and heavy-duty manufacturing setups. Its 3/4"-10 UNC coarse thread facilitates quick assembly in structural applications, while the partial threading ensures optimal stress distribution, reducing the risk of shear failure. With an external hex drive and substantial head width of 1 1/8", it allows for high-torque installation with standard tools, enhancing efficiency in maintenance and production lines where reliability is paramount.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit for precise dimensional accuracy and smooth assembly. It meets UNC coarse thread standards with a size of 3/4"-10 and a minimum thread length of 1 3/4". The product is manufactured to Grade 9 strength specifications, ensuring consistent performance under tensile loads up to 180,000 PSI. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms it is free from hazardous substances, supporting safe use in various industrial sectors.