S-90519A838 M18 ASTM A108, DIN 439B, ISO 4035 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel finish, extending service life in humid or demanding environments.
• Secure anti-loosening performance due to left-hand thread direction, ideal for applications with counter-rotational forces.
• Space-saving design with a thin 9mm height profile, allowing use in compact assemblies without compromising strength.
• Precise and reliable thread engagement ensured by Class 6H thread fit and fine 1.5mm pitch, reducing the risk of cross-threading.
• Consistent quality and interchangeability through compliance with ASTM A108, DIN 439B, and ISO 4035 standards.
• Dependable mechanical performance with Class 04 strength rating, suitable for general industrial and construction uses.
• Environmental and regulatory safety with RoHS 3 and REACH compliance, meeting global supply chain requirements.

Professional Applications & Engineering Value

This M18 thin hex nut is engineered to address critical challenges in machinery, automotive, and structural applications where reverse rotation or vibration is a concern. The left-hand metric thread provides a reliable fastening solution for components that rotate counter-clockwise, preventing unintentional loosening. Manufactured from black-oxide steel, it offers superior protection against rust and wear, enhancing durability in outdoor or high-moisture settings. The fine thread pitch and Class 6H thread fit ensure tight tolerances and vibration resistance, reducing maintenance needs and improving assembly safety. Its thin profile allows for efficient use in space-constrained designs, making it a versatile choice for engineers seeking a high-performance, metric hex nut that meets rigorous international standards.

Specification Summary & Compliance

This nut features an M18 x 1.5 mm left-hand fine thread with Class 6H thread fit per ISO metric standards, ensuring precise dimensional accuracy. It conforms to ASTM A108, DIN 439B, and ISO 4035 manufacturing specifications, with a strength rating of Class 04. The product is fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) regulations, supporting sustainable and safe industrial applications.