S-90201A121 1/4"-20 x 2 1/2" Extreme-Strength Grade 9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with Grade 9 classification and 180,000 psi tensile strength for reliable performance in high-stress environments
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding industrial conditions
• Optimized thread engagement through UNC coarse threading and Class 2A fit ensures secure fastening and vibration resistance
• Enhanced installation efficiency with external hex drive design allowing for high torque application and quick assembly
• Precision manufacturing consistency with Rockwell C38 hardness maintaining dimensional stability under heavy loads
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use across various industries
• Versatile partial threading design providing both gripping strength and clearance where needed in assembly applications

Professional Applications & Engineering Value

This Grade 9 hex head screw delivers critical engineering solutions for heavy-duty applications where failure is not an option. The combination of 180,000 psi tensile strength and Rockwell C38 hardness ensures structural integrity under extreme mechanical stress, while the zinc yellow-chromate plating provides durable protection against corrosion in harsh environments. The 1/4"-20 UNC coarse thread configuration offers superior grip in various materials, and the external hex drive enables efficient installation with standard tools. These steel fasteners are engineered for critical assemblies in construction equipment, industrial machinery, and transportation systems where reliability and longevity are paramount.

Specification Summary & Compliance

This high-strength hex head screw features precise Class 2A thread fit with 1/4"-20 UNC coarse thread specifications in the inch measurement system. The fastener maintains dimensional accuracy with partial threading extending to a minimum of 3/4". Manufacturing compliance includes adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across industrial applications while meeting rigorous quality standards for heavy-duty fastening solutions.