S-90519A851 5-40 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 with black-oxide steel coating for extended service life in demanding environments
- Secure left-hand thread engagement prevents loosening under counter-clockwise rotational forces in specialized applications
- Space-saving thin profile (3/32" height) enables installation in tight clearance areas without compromising strength
- Reliable Grade 2 strength classification ensures consistent performance for general industrial fastening requirements
- Precision UNC coarse threading with Class 2B fit facilitates quick assembly and reduces cross-threading risks
- Standard 5/16" hex drive provides compatibility with common wrenching tools for efficient installation
- Full regulatory compliance with RoHS 3 and REACH standards for environmentally conscious manufacturing operations
Professional Applications & Engineering Value
This left-hand thread hex nut solves critical reverse-threading challenges in rotating machinery, safety equipment, and specialized industrial assemblies where standard right-hand threads would loosen under operational stresses. The black-oxide steel construction provides superior corrosion protection compared to plain steel, while the thin hex profile maximizes space utilization in compact designs. Engineered to ASTM A108 specifications with UNC coarse threading, this fastener delivers reliable performance in high-vibration applications requiring left-hand thread security. The combination of Grade 2 strength and Class 2B thread fit ensures consistent clamping force while maintaining installation efficiency across production runs.
Specification Summary & Compliance
This 5-40 UNC left-hand thin hex nut features precise Class 2B thread fit tolerances with coarse thread spacing for optimal engagement. Manufactured in compliance with ASTM A108 material specifications and carrying Grade 2 strength classification. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Dimensions include 5/16" width across flats and 3/32" height profile with external hex drive configuration.
