Product Specifications
| Model / Specification | M3 - M6 |
| Material | Carbon Steel |
| Thread Spec. D |
M5 | M6 | M8 | M10 | M12 | (M14) | M16 | M20 | |
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| c | Min. | 1.0 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3.0 |
| da | Min. | 5.75 | 6.75 | 8.75 | 10.80 | 13.00 | 15.10 | 17.30 | 21.60 |
| Min. | 5.00 | 6.00 | 8.00 | 10.00 | 12.00 | 14.00 | 16.00 | 20.00 | |
| dc | Min. | 11.8 | 14.2 | 17.9 | 21.8 | 26.0 | 29.9 | 24.5 | 42.8 |
| dw | Min. | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.9 | 31.9 | 39.9 |
| e | Min. | 8.79 | 11.05 | 14.38 | 16.64 | 20.03 | 23.36 | 26.75 | 32.95 |
| h | Min. | 7.1 | 9.1 | 11.1 | 13.5 | 16.1 | 18.2 | 20.3 | 24.8 |
| Min. | 6.52 | 8.52 | 10.4 | 12.8 | 15.4 | 16.9 | 19.0 | 22.7 | |
| m | Min. | 4.7 | 5.7 | 7.64 | 9.64 | 11.57 | 13.3 | 15.3 | 18.7 |
| mw | Min. | 2.5 | 3.1 | 4.6 | 5.6 | 6.8 | 7.7 | 8.9 | 10.7 |
| s | Min. | 8 | 10 | 13 | 15 | 18 | 21 | 24 | 30 |
| Min. | 7.78 | 9.78 | 12.73 | 14.73 | 17.73 | 20.67 | 23.67 | 29.16 | |
| r | Min. | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1.0 | 1.2 |
| Steel Wt. ≈ kg/1000 pcs | 1.66 | 3.36 | 7 | 11.15 | 19.33 | 29.21 | 43.24 | 78.44 | |
Type 2 Non-Metal Insert Hex Flange Lock Nut – Product Introduction
This is an effective torque-type anti-loosening nut specifically designed for heavy-duty and high-strength connections. Compared with Type 1, it features a greater nut height and higher load-bearing capacity. It integrates a one-piece flange face (replacing flat washers) and a built-in nylon insert (replacing spring washers and other anti-loosening components). When the bolt is threaded in, the thread squeezes the nylon ring to generate a powerful locking torque, ensuring firm locking even under severe impact and vibration.
I. Product Features
Type 2 High Nut Design: The nut height is significantly greater than Type 1, providing a longer thread engagement length that guarantees high-strength connection requirements, typically corresponding to Grade 10 or Grade 12.
Integrated Flange Face for Pressure Distribution: The enlarged flange at the base increases the contact area, distributes pressure evenly, and eliminates the need for additional flat washers.
Nylon Insert Locking: Equipped with standard PA66 nylon ring that generates stable and repeatable effective torque, ensuring reliable anti-loosening performance.
Defined Temperature Resistance Range: PA66 insert is suitable for -50°C to +120°C, with short-term tolerance for higher temperatures, though locking performance may decline.
Quenching and Tempering Treatment: The nut body undergoes heat treatment to meet the high-strength requirements of Grade 10 or Grade 12.
II. Product Advantages
Higher Load-Bearing Capacity: The Type 2 structure ensures that proof load and tensile strength are significantly higher than Type 1 nuts of the same specification, making it suitable for higher preload applications.
Ultimate Anti-Loosening Performance: Delivers robust performance under extreme vibration and alternating loads, making it a reliable choice for critical locations such as automotive chassis and engines.
Simplified Assembly: One component integrates three functions — fastening, anti-loosening, and pressure distribution — reducing part count and eliminating missing spring washers, flat washers, or both.
Workpiece Surface Protection: The smooth-edged flange face will not damage workpiece surface coatings or metal the way spring washers sometimes can.
Standardized Interchangeability: Strictly conforms to national standard Type 2 dimensions, directly interchangeable with nuts of the same standard, facilitating maintenance and replacement.
III. Applications
Suitable for heavy-duty structures with extremely high safety and reliability requirements and exposure to severe vibration:
Commercial Vehicles and Construction Machinery: Heavy-duty truck chassis suspension, engine mounts, wheel hubs, and driveshaft connections.
Rail Transit: Bogie components, coupler draft gears, and critical trackside equipment.
Mining and Construction Machinery: Structural fastening of crushers, vibrating screens, pile drivers, and other heavy-impact equipment.
Wind Power Generation: High-strength components inside nacelles and pitch bearing connections.
Shipbuilding and Marine Engineering: Hatch covers, equipment bases, and other locations requiring both corrosion resistance and anti-loosening performance.
