S-90519A855 8-32 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, extending service life in harsh industrial environments
- Secure left-hand thread engagement prevents unintentional loosening in rotating machinery and specialized equipment
- Space-saving thin profile (7/64" height) enables installation in tight clearance applications without compromising strength
- Reliable coarse UNC threading provides faster assembly and reduced cross-threading risk compared to fine-pitch alternatives
- Precision Class 2B thread fit ensures consistent mating with Class 2A screws for vibration-resistant connections
- Standard external hex drive offers compatibility with common wrenching tools for efficient installation and maintenance
- Full regulatory compliance meets ASTM A108 material specifications while adhering to RoHS 3 and REACH environmental standards
Professional Applications & Engineering Value
Engineered for demanding industrial scenarios where reverse-thread security is critical, this 8-32 UNC left-hand thin hex nut solves common fastening challenges in rotating assemblies and machinery. The black-oxide steel construction provides superior corrosion protection compared to plain carbon steel, while the thin hex profile maintains Grade 2 strength in space-constrained applications. Manufacturers specify this component for conveyor systems, power transmission equipment, and automotive assemblies where left-hand threading prevents vibrational loosening. The coarse UNC thread form enables rapid installation in high-volume production environments, reducing assembly time while maintaining Class 2B thread fit precision for consistent torque performance.
Specification Summary & Compliance
This fastener maintains Class 2B thread tolerances per Unified National Coarse (UNC) standards with 8-32 thread sizing. Manufactured from Grade 2 steel meeting ASTM A108 material requirements, the nut features 11/32" width across flats and 7/64" height. 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 as of January 2023.
