S-90519A871 1/2"-13 ASTM A108 Hex Nuts
Hex Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Enhanced corrosion resistance through black-oxide steel coating, extending service life in demanding industrial environments
- Secure left-hand thread engagement prevents loosening under counter-clockwise rotational forces in specialized machinery
- Space-saving thin profile (5/16" height) enables installation in confined areas where standard nuts won't fit
- Reliable coarse threading (1/2"-13 UNC) provides faster assembly and reduced cross-threading risks
- Precision Class 2B thread fit ensures consistent mating with male threads for vibration-resistant connections
- External hex drive compatibility allows standard wrenching tools for quick installation and maintenance
- Regulatory compliance assurance with RoHS 3 and REACH standards for global supply chain integration
Professional Applications & Engineering Value
This left-hand thread hex nut solves critical reverse-rotation challenges in rotating equipment, conveyor systems, and machinery where standard right-hand threads would naturally loosen. The black-oxide steel construction provides superior corrosion protection without changing dimensional tolerances, making it ideal for automotive, manufacturing, and outdoor applications. The thin hex profile maintains full Grade 2 strength while reducing weight and clearance requirements. Engineered to ASTM A108 specifications with UNC coarse threading, this fastener delivers reliable performance in high-vibration environments while accommodating minor material deformations. The external hex drive design ensures compatibility with standard industrial tools for efficient maintenance operations.
Specification Summary & Compliance
Manufactured to ASTM A108 standards with 1/2"-13 UNC coarse threads in left-hand orientation. Features Class 2B thread fit for consistent mating with Class 2A external threads. Dimensions include 3/4" width across flats and 5/16" height in thin profile configuration. Compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and REACH (EC 1907/2006) regulations regarding SVHC substances. Meets Grade 2 strength requirements for general industrial fastening applications.
