S-90211A420 3/4"-10 x 1 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws
Left-Hand Threaded High-Strength Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional strength and durability with Grade 8 classification and 150,000 psi tensile strength, ideal for high-stress applications
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 3A fit and UNC coarse threads, ensuring reliable fastening and vibration resistance
- Left-hand threading design for specialized applications requiring reverse-thread security, such as rotating machinery
- High hardness rating of Rockwell C33, providing excellent wear resistance and reduced risk of stripping
- Full threading along the 1 1/2" length for maximum grip and adjustability in assembled components
- External hex drive and standard head dimensions (1 1/8" width, 1/2" height) for easy installation with common tools
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where left-hand threading prevents loosening under counter-clockwise motion. The steel construction with zinc yellow-chromate plating combats corrosion in outdoor or chemically exposed settings, while the UNC coarse thread and Class 3A fit deliver consistent clamping force and reduce cross-threading risks. With a 150,000 psi tensile strength and full threading, it ensures secure fastening in high-vibration environments, making it a reliable choice for industrial screws in demanding assemblies.
Specification Summary & Compliance
This fastener adheres to SAE J429 specifications for Grade 8 mechanical properties, featuring a 3/4"-10 UNC coarse thread with Class 3A thread fit for precision tolerance. The zinc yellow-chromate plated finish meets common industry standards for corrosion protection, and the left-hand thread direction complies with applicable engineering requirements. Dimensions include a 1 1/2" length, 1 1/8" head width, and 1/2" head height, ensuring compatibility with standard tooling and assembly designs.
