S-92190A151 1/2"-13 x 4" ASME B18.2.1, SAE J429 Left-Hand Threaded Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 5 steel construction providing 110,000 psi tensile strength and Rockwell C21 hardness.
• Reliable, secure fastening in high-vibration environments due to the left-hand thread direction, which resists loosening under counter-clockwise rotation.
• Superior thread engagement and durability from the fully threaded UNC coarse thread design and Class 2A thread fit, ensuring consistent performance.
• Efficient installation and removal with a standard 3/4" external hex head, allowing for high torque application with common tools.
• Guaranteed dimensional consistency and interchangeability as it meets ASME B18.2.1 and SAE J429 specifications.
• Safe for use in regulated industries with compliance to RoHS 3 and REACH environmental standards.
• Versatile 4-inch length provides ample grip for thick materials and assemblies.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to solve critical fastening challenges in industrial settings. Its left-hand thread is specifically designed for applications where standard right-hand threads would loosen under reverse rotational forces, such as in rotating machinery, mixer blades, or certain automotive components. The UNC coarse threading and Class 2A fit enable quick assembly and superior resistance to cross-threading and stripping, even in less-than-ideal field conditions. Manufactured from high-strength steel and heat-treated to a Rockwell C21 hardness, this fully threaded screw maintains its integrity under significant tensile and shear loads, making it a reliable choice for structural frameworks, heavy equipment, and other demanding industrial applications where failure is not an option.

Specification Summary & Compliance

This fastener features a 1/2"-13 UNC thread with a Class 2A thread fit, ensuring precise dimensional tolerances for reliable performance. It is manufactured in compliance with ASME B18.2.1 and SAE J429 standards, guaranteeing consistent quality and interchangeability. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental regulations for hazardous substances.