Product Specifications
| Model / Specification | M3 – M130 |
| Material | Carbon Steel |
| Appl. | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | |
| d | Max. | 2.95 | 3.5 | 4.5 | 5.6 | 6.76 | 8.76 | 10.93 | 13.43 | 15.43 | 17.43 |
| Min. | 2.7 | 3.2 | 4.2 | 5.3 | 6.4 | 8.4 | 10.5 | 13 | 15 | 17 | |
| D | Max. | 5 | 5 | 8 | 9 | 11 | 14 | 17 | 22 | 22 | 27 |
| Min. | 4.7 | 4.7 | 7.64 | 8.64 | 10.57 | 13.57 | 16.57 | 21.48 | 21.48 | 26.48 | |
| L | Nom. | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 28 | 28 | 32 |
| Min. | 9.71 | 11.65 | 13.65 | 15.65 | 17.65 | 19.58 | 21.58 | 27.58 | 27.58 | 31.5 | |
| Max. | 10.29 | 12.35 | 14.35 | 16.35 | 18.35 | 20.42 | 22.42 | 28.42 | 28.42 | 32.5 | |
| L1 | Nom. | 4 | 5 | 7 | 8 | 9 | 11 | 13 | 16 | 16 | 20 |
| Min. | 3.76 | 4.76 | 6.71 | 7.71 | 8.71 | 10.65 | 12.65 | 15.65 | 15.65 | 19.58 | |
| Max. | 4.24 | 5.24 | 7.29 | 8.29 | 9.29 | 11.35 | 13.35 | 16.35 | 16.35 | 20.42 | |
| B | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 12 | 15 | |
| h | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 | |
| r | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | |
| Wt/1000 (steel) | 0.12 | 0.17 | 0.3 | 0.48 | 0.64 | 0.81 | 1.11 | 3.78 | 3.43 | 5.32 | |
| Appl. | (M18) | M20 | (M22) | M24 | (M27) | M30 | M36 | M42 | M48 | |
| d | Max. | 19.52 | 21.52 | 23.52 | 25.52 | 28.52 | 31.62 | 37.62 | 43.62 | 50.62 |
| Min. | 19 | 21 | 23 | 25 | 28 | 31 | 37 | 43 | 50 | |
| D | Max. | 32 | 32 | 36 | 36 | 41 | 46 | 55 | 65 | 75 |
| Min. | 31.38 | 31.38 | 35.38 | 35.38 | 40.38 | 45.38 | 54.26 | 64.26 | 74.26 | |
| L | Nom. | 36 | 36 | 42 | 42 | 48 | 52 | 62 | 70 | 80 |
| Min. | 35.5 | 35.5 | 41.5 | 41.5 | 47.5 | 51.4 | 61.4 | 69.4 | 79.4 | |
| Max. | 36.5 | 36.5 | 42.5 | 42.5 | 48.5 | 52.6 | 62.6 | 70.6 | 80.6 | |
| L1 | Nom. | 22 | 22 | 25 | 25 | 30 | 32 | 38 | 44 | 50 |
| Min. | 21.58 | 21.58 | 24.58 | 24.58 | 29.58 | 31.5 | 37.5 | 43.5 | 49.5 | |
| Max. | 22.42 | 22.42 | 25.42 | 25.42 | 30.42 | 32.5 | 38.5 | 44.5 | 50.5 | |
| B | 18 | 18 | 20 | 20 | 24 | 26 | 30 | 35 | 40 | |
| h | 1 | 1 | 1 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | |
| r | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | |
| Wt/1000 (steel) | 5.27 | 6.78 | 9.01 | 10.43 | 17.54 | 20.95 | 29.39 | 39.81 | 51.84 | |
Double-Tab Locking Washer — Product Introduction
The double-tab locking washer, manufactured in accordance with the GB/T 855—1988 standard, consists of a washer body, an inner tab, and two outer tabs (ears). During use, the inner tab is inserted into the shaft keyway, and the two outer tabs are bent separately to lock against two opposing flank faces of the round nut or fixed positions of adjacent components, forming a more robust mechanical lock that effectively prevents the nut from loosening under vibration and impact. The product features a symmetrical structure for easy installation and is particularly suitable for applications requiring enhanced anti-loosening reliability.
I. Product Features
- Standardized structure: Dimensions conform to GB/T 855—1988, ensuring good compatibility and strong interchangeability with standard round nuts.
- Double-tab design: Equipped with two outer tabs that can be bent and locked from two positions, providing more locking points and more reliable anti-loosening performance.
- One-piece forming: The washer body, inner tab, and outer tabs are stamped in a single operation with no welding joints, ensuring excellent overall strength.
- Easy bending: The outer tabs and inner tab are designed for easy on-site bending and straightening, allowing flexible installation and removal.
- Smooth surface: Edges are free of burrs, preventing damage to shafts, nuts, and other mating surfaces during assembly.
II. Product Advantages
- More reliable anti-loosening: The double-tab bend-locking creates multi-point mechanical locking, delivering stronger vibration and impact resistance than single-tab structures.
- Balanced force distribution: The two outer tabs are arranged symmetrically, distributing locking force evenly and reducing localized stress concentration.
- Simple operation: No special tools are required; standard pliers are sufficient for bending, locking, and disassembly.
- Easy maintenance: During removal, simply straighten the outer tabs and the nut can be unscrewed; the washer is reusable or replaceable.
- Strong versatility: Compatible with GB/T 812 and other standard round nuts, suitable for a wide range of mechanical drive and fastening structures.
III. Application Scope
Double-tab locking washers are widely used in shaft-end positions where round-nut anti-loosening is required and vibration is significant, including:
- General machinery: Gearboxes, motors, pumps, fans, drive shafts, etc.
- Automotive and motorcycles: Steering mechanisms, drive shafts, wheel hubs, and other critical fastening points.
- Construction machinery: Excavators, loaders, lifting equipment, and other high-vibration applications.
- Agricultural machinery: Tractors, harvesters, seeders, etc.
- Mining and metallurgical equipment: Crushers, vibrating screens, rolling mills, etc.
- Power and telecommunications equipment: Outdoor installations, towers, terminal connections, and other threaded connections requiring anti-loosening protection.
