S-90211A424 3/4"-10 x 2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with 150,000 psi tensile strength and Grade 8 classification for demanding industrial applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening in critical assemblies
• Enhanced torque transmission via external hex drive design that prevents tool slippage during installation
• Reverse-threading safety with left-hand thread direction for specialized applications where standard rotation could cause loosening
• Full-length threading providing consistent grip strength along the entire 2" fastener length
• Industry-standard compliance meeting SAE J429 specifications for guaranteed performance and interchangeability

Professional Applications & Engineering Value

This Grade 8 steel hex head screw delivers exceptional engineering value in heavy-duty applications where vibration resistance and reverse-threading requirements are critical. The left-hand UNC coarse thread configuration provides secure fastening in rotating equipment where standard right-hand threads might loosen under operational stress. The combination of Rockwell C33 hardness and 150,000 psi tensile strength ensures structural integrity in high-stress environments, while the zinc yellow-chromate plating offers superior corrosion protection for extended service life in industrial settings. The external hex drive and 1 1/8" head width enable high-torque installation without stripping, making this fastener ideal for machinery, construction equipment, and automotive applications requiring reliable, high-strength connections.

Specification Summary & Compliance

Manufactured to SAE J429 specifications with Class 3A thread fit precision and UNC coarse thread profile. The fastener features 3/4"-10 left-hand threading in inch measurement system, 2" length, and fully threaded design. Complies with industry standards for dimensional accuracy and mechanical properties, including Grade 8 strength classification and Rockwell C33 hardness requirements. The zinc yellow-chromate plating provides corrosion resistance while maintaining compliance with industrial fastener specifications.