| Parameter | Specification |
|---|---|
| Product Name | Yellow Zinc Plated Nylon Insert Lock Nut (Hex Self-locking Nut) |
| Product Type | Hex Nyloc Lock Nut / Vibration-proof Anti-loosening Nut |
| Material | Grade 4.8 / 8.8 Carbon Steel + PA66 Nylon Ring |
| Surface Finish | Yellow Zinc Plated |
| Thread Type | Metric Standard Internal Thread |
| Standard Compliance | DIN 985, GB/T 889.1, ISO Fastener Standard |
| OEM Service | Available |
| ODM Service | Available |
| Custom Manufacturing | Custom Sizes According to Drawings or Samples |
| Standard Sizes | M3 – M36 |
| Salt Spray Resistance | 72–120 Hours |
| Applications | Automotive Assembly, Mechanical Equipment, Solar Brackets, Electrical Cabinets, Agricultural Machinery, Vibration-prone Engineering Components |
Yellow Zinc Plated Nylon Insert Lock Nut
The Yellow Zinc Plated Nylon Insert Lock Nut is a reliable self-locking fastener specially designed to prevent loosening of bolt connections under continuous vibration, shock and alternating load in automotive, machinery, solar and general industrial assembly projects. It combines a standard hex carbon steel nut body with an integrated PA66 nylon locking ring inside the upper cavity. The nylon insert creates tight interference fit with bolt threads after tightening, delivering lasting anti-loosening performance and avoiding accidental disassembly during long-term equipment operation.
Manufactured from premium grade 4.8 or 8.8 carbon steel, the hex nut body features stable tensile strength and compression resistance. The surface adopts yellow zinc electroplating treatment, forming a thick multi-color anti-corrosion zinc layer that effectively isolates moisture and oxidation, greatly improving rust resistance compared to ordinary nuts. The built-in high toughness PA66 nylon ring possesses excellent wear resistance and temperature adaptability, maintaining stable clamping friction without aging or deformation under normal working temperature ranges.
The built-in nylon ring interference locking structure provides superior vibration resistance. When the nut is screwed onto matching bolts, internal threads squeeze the elastic nylon insert to form firm friction restraint on the bolt shank, offsetting rotation loosening force generated by mechanical vibration, bump and thermal expansion. Standard six-sided outer shape facilitates quick tightening with spanners and wrenches, perfectly compatible with manual operation and automated assembly production lines. Precision tapped internal threads match standard bolts smoothly for consistent clamping force.
Nylon insert lock nuts are widely used for automotive chassis and body assembly, heavy mechanical equipment connection, solar panel bracket fixing, electrical control cabinet installation, agricultural machinery linkage, and all kinds of vibration-prone mechanical fastening systems. Its dual advantages of reliable self-locking anti-loosening effect and good anti-rust performance make it a core fastener for dynamic load assembly projects.
We provide full OEM and ODM manufacturing services and support customized production based on customer technical drawings, physical samples and special specification requirements. Custom thread sizes, nut height, nylon ring hardness, plating thickness and personalized export packaging options are available to meet unique project demands. Private labeling, laser marking and custom brand printing services are also supported for hardware distributors, auto parts factories, solar manufacturers and machinery engineering contractors.
Each yellow zinc plated nylon insert lock nut is produced under strict fastener quality control standards. All finished nuts undergo comprehensive dimensional inspection, thread precision test, nylon ring locking friction sampling test and surface anti-corrosion coating inspection before shipment, to guarantee accurate thread tolerance, stable self-locking performance and uniform qualified yellow zinc coating for every product batch.
