Product Specifications
| Model / Specification | M2.5 – M48 |
| Material | Carbon Steel |
| Applicable to | 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 | |
| dc | Max. | 10 | 12 | 14 | 17 | 19 | 22 | 26 | 32 | 32 | 40 |
| Min. | 9.64 | 11.57 | 13.57 | 16.57 | 18.48 | 21.48 | 25.48 | 31.38 | 31.38 | 39.38 | |
| b | Max. | 2 | 2.5 | 2.5 | 3.5 | 3.5 | 3.5 | 4.5 | 4.5 | 4.5 | 5.5 |
| Min. | 1.75 | 2.25 | 2.25 | 3.2 | 3.2 | 3.2 | 4.2 | 4.2 | 4.2 | 5.2 | |
| L | Nom. | 3.5 | 4.5 | 5.5 | 7 | 7.5 | 8.5 | 10 | 12 | 12 | 15 |
| Min. | 3.2 | 4.2 | 5.2 | 6.64 | 7.14 | 8.14 | 9.64 | 11.57 | 11.57 | 14.57 | |
| Max. | 3.8 | 4.8 | 5.8 | 7.36 | 7.86 | 8.86 | 10.36 | 12.43 | 12.43 | 15.43 | |
| h | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 1 | 1 | |
| Wt./1000 pcs | 0.21 | 0.3 | 0.41 | 0.75 | 0.92 | 1.2 | 1.65 | 5 | 4.65 | 7.73 | |
| Applicable to | (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 | |
| dc | Max. | 45 | 45 | 50 | 50 | 58 | 63 | 75 | 88 | 100 |
| Min. | 44.38 | 44.38 | 49.38 | 49.38 | 57.26 | 62.26 | 74.26 | 87.13 | 99.13 | |
| b | Max. | 6 | 6 | 7 | 7 | 8 | 8 | 11 | 11 | 13 |
| Min. | 5.7 | 5.7 | 6.64 | 6.64 | 7.64 | 7.64 | 10.57 | 10.57 | 12.57 | |
| L | Nom. | 18 | 18 | 20 | 20 | 23 | 25 | 31 | 36 | 40 |
| Min. | 17.57 | 17.57 | 19.48 | 19.48 | 22.48 | 24.48 | 30.38 | 35.38 | 39.38 | |
| Max. | 18.43 | 18.43 | 20.52 | 20.52 | 23.52 | 25.52 | 31.62 | 36.62 | 40.62 | |
| h | 1 | 1 | 1 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | |
| Wt./1000 pcs | 9.85 | 10.36 | 11.7 | 13.11 | 22.92 | 26.79 | 38.09 | 52.77 | 67.33 | |
External Tab Washer — Product Introduction
The external tab washer is manufactured according to standard GB/T 856—1988 and consists of the washer body, an inner tongue, and an outer tongue. In use, the inner tongue inserts into the shaft groove and the outer tongue bends and locks into the slot on the outer circumference of the round nut, forming a dual mechanical lock that effectively prevents the nut from loosening under vibration and impact. The product has a compact structure and convenient installation, suitable for anti-loosening connections where the round nut’s outer circumference is slotted.
I. Product Features
- Standard structure: Dimensions conform to GB/T 856—1988, with good compatibility with standard round nuts and strong interchangeability.
- Outer tongue design: The outer tongue bends and locks into the slot on the outer circumference of the round nut, providing accurate positioning and reliable locking.
- One-piece forming: The washer body, inner tongue, and outer tongue are formed in a single stamping operation with no weld points, giving excellent overall strength.
- Easy bending: The outer and inner tongues are convenient to bend and straighten on site, allowing flexible installation and removal.
- Smooth surface: Edges are free of burrs and do not damage the mating surfaces of shafts, nuts, and other components during assembly.
II. Product Advantages
- Reliable anti-loosening: The inner tongue locks into the shaft groove and the outer tongue into the nut groove, forming a dual mechanical lock with excellent anti-loosening performance.
- Accurate positioning: The outer tongue engages with the round nut slot, fixing the locked position and resisting displacement.
- Simple operation: No special tools are required — ordinary pliers complete the bending lock and removal.
- Easy maintenance: When disassembling, simply straighten the outer tongue so the nut can be unscrewed; the washer can be reused or replaced.
- Compact structure: The outer tongue fits into the nut slot, occupying minimal space, suitable for compact assemblies.
III. Application Areas
The external tab washer is widely used at the anti-loosening locations of shaft ends where the round nut’s outer circumference is slotted, including:
- General machinery: Reducers, motors, pumps, fans, transmission shafts, etc.
- Automotive and motorcycle: Steering mechanisms, transmission shafts, wheel hubs, and other fastening locations.
- Construction machinery: Excavators, loaders, lifting equipment, and other high-vibration environments.
- Agricultural machinery: Tractors, harvesters, seeders, etc.
- Mining and metallurgical equipment: Crushers, vibrating screens, rolling mills, etc.
