S-90392A039 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains clamping force in high-stress environments
• Exceptional strength and durability with Grade 8 steel construction, capable of withstanding extreme mechanical loads
• Reliable left-hand thread security for applications requiring reverse-threading protection against rotational loosening
• Enhanced corrosion protection with zinc plating that extends service life in demanding industrial conditions
• Precise thread engagement with Class 2B fit ensuring consistent performance and easy installation
• Standard external hex drive for compatibility with common tools and straightforward installation/removal
• Regulatory compliance assurance meeting both REACH and RoHS 3 standards for environmental and safety requirements

Professional Applications & Engineering Value

This Grade 8 zinc-plated steel locknut delivers critical vibration resistance in demanding industrial applications where conventional fasteners fail. The center lock distorted thread technology creates permanent friction along the thread engagement, effectively preventing self-loosening under dynamic loads and thermal cycling. Engineered with left-hand UNC coarse threads, this locknut provides essential reverse-threading security for rotating equipment, machinery shafts, and automotive systems where standard right-hand rotation would cause unintended disassembly. The zinc-plated finish offers corrosion protection in harsh environments, while the external hex drive ensures compatibility with standard wrenching tools for efficient installation and maintenance cycles. Ideal for heavy machinery, industrial equipment, and transportation applications requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This locknut features 3/8"-16 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and reliable engagement. Manufactured to Grade 8 strength specifications with standard hex profile and external drive style. The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe use across industrial applications. The center lock distorted thread mechanism provides permanent locking capability without requiring additional components.