S-90519A895 2"-4 1/2 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
- Left-hand threading provides secure fastening in applications where standard right-hand threads may loosen due to rotational forces
- Black-oxide steel construction offers superior corrosion resistance for extended service life in demanding industrial environments
- Thin profile design enables installation in space-constrained applications without compromising strength
- Grade 2 strength classification delivers reliable performance for general purpose and heavy-duty fastening requirements
- Coarse UNC thread spacing ensures quick assembly and disassembly while resisting vibration-induced loosening
- Class 2B thread fit provides optimal balance between easy assembly and secure fastening engagement
- External hex drive style allows for standard wrench application with familiar torque specifications
Professional Applications & Engineering Value
These specialized left-hand thread hex nuts solve critical engineering challenges in applications where counter-rotational forces are present, such as rotating machinery, conveyor systems, and power transmission equipment. The Black-Oxide Steel material provides essential corrosion protection while maintaining the mechanical properties required for industrial service. The thin profile design addresses space limitations in complex assemblies without sacrificing the structural integrity needed for Grade 2 applications. With coarse UNC threading and Class 2B thread fit, these fasteners deliver reliable performance in high-vibration environments while maintaining ease of installation and removal for maintenance operations.
Specification Summary & Compliance
Manufactured to ASTM A108 specifications with Class 2B thread fit tolerance and UNC coarse thread spacing. These hex nuts feature a 3" width and 1 3/32" height in inch system measurements. Full compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) regulations as of January 17, 2023, covering 233 SVHC substances.
