DIN5406 MB Lock Washers
DIN 5406 MB Lock Washers are tab-type locking devices designed to secure DIN 981 locknuts on shafts. The washer has an inner tab that engages with the shaft and an outer tab that can be bent into one of the slots in the locknut. Once installed, this mechanical locking arrangement helps prevent the locknut from rotating during operation. The MB washer is particularly useful in bearing arrangements and shaft-mounted assemblies where components such as rolling bearings need to be positioned and secured axially. Unlike friction-based locking methods, the folded tab provides a direct mechanical connection between the washer and locknut, making the locking function less dependent on friction alone.
DIN 5406 MB Lock Washers are available in different sizes to match DIN 981 locknuts and corresponding shaft diameters. They are commonly used in bearing assemblies, gearboxes, transmission components, motors, pumps, and other rotating equipment where reliable shaft-mounted fastening is required.
Specification:
DIN 5406 MB Lock Washers are specified for use with DIN 981 locknuts in shaft-mounted assemblies. Unlike a conventional flat washer, the MB washer incorporates an inner tab and multiple outer locking tabs. The inner tab engages with the shaft, while one outer tab is bent into a slot of the locknut after tightening to create a mechanical locking connection. The washer size is selected according to the corresponding shaft diameter and DIN 981 locknut size. Carbon steel and stainless steel versions can be supplied for different mechanical and environmental requirements, with surface finishes available according to the material and application.
| Product name | DIN5406 Rolling Bearings Lock Washers |
|---|---|
| Standard | DIN5406 |
| Type | MB |
| Product Type | Lock Washer/Tap Washer |
| Inner Tab | Engages with Shaft groove/Keyway |
| Inner Diamter | Φ10-Φ280 |
| Material | Carbon Steel, Stainless Steel |
| Surface Treatment | Zinc Plated,Black Oxidation,Bright Finish |
| Application | DIN981 |
Dimension Chart of DIN5406 MB Lock Washers:
The DIN 5406 MB dimension chart provides the key measurements required to match the lock washer with the corresponding DIN 981 locknut and shaft. The nominal size identifies the compatible shaft and locknut size, while the washer diameter, thickness, and tab dimensions determine how the washer fits within the locking arrangement.
When checking dimensions, the inner tab and central opening are particularly important because they need to engage correctly with the shaft. The outer locking tabs must also correspond with the slots in the DIN 981 locknut so that one tab can be folded into the nut after tightening.
| Mon | Φ10 | Φ12 | Φ15 | Φ17 | Φ20 | Φ25 | Φ30 | Φ35 | Φ40 | Φ45 | Φ50 | Φ55 | Φ60 | Φ65 | Φ70 | Φ75 | Φ80 | Φ85 | Φ90 | Φ95 | Φ100 |
| d max | 10.17 | 12.205 | 15.205 | 17.205 | 20.24 | 25.24 | 30.24 | 35.28 | 40.28 | 45.29 | 50.29 | 55.33 | 60.33 | 65.33 | 70.34 | 75.34 | 80.34 | 85.39 | 90.39 | 95.39 | 100.39 |
| d min | 10.08 | 12.095 | 15.095 | 17.095 | 20.11 | 25.11 | 30.11 | 35.12 | 40.12 | 45.13 | 50.13 | 55.14 | 60.14 | 65.14 | 70.15 | 75.15 | 80.15 | 85.17 | 90.17 | 95.17 | 100.17 |
| d1 max | 13.5 | 17 | 21 | 24 | 26 | 32 | 38 | 44 | 50 | 56 | 61 | 67 | 73 | 79 | 85 | 90 | 95 | 102 | 108 | 113 | 120 |
| d1 min | 13.23 | 16.73 | 20.67 | 23.67 | 25.67 | 31.61 | 37.61 | 43.61 | 49.61 | 55.54 | 60.54 | 66.54 | 72.54 | 78.54 | 84.46 | 89.46 | 94.46 | 101.46 | 107.46 | 112.46 | 119.46 |
| b max | 2.73 | 2.73 | 3.73 | 3.73 | 3.73 | 4.73 | 4.73 | 5.73 | 5.73 | 5.73 | 5.73 | 7.72 | 7.72 | 7.72 | 7.72 | 7.72 | 9.72 | 9.72 | 9.72 | 9.72 | 11.71 |
| b min | 2.33 | 2.33 | 3.25 | 3.25 | 3.25 | 4.25 | 4.25 | 5.25 | 5.25 | 5.25 | 5.25 | 7.14 | 7.14 | 7.14 | 7.14 | 7.14 | 9.14 | 9.14 | 9.14 | 9.14 | 11.01 |
| n max | 8.67 | 10.705 | 13.705 | 15.705 | 18.74 | 23.24 | 27.74 | 32.78 | 37.78 | 42.79 | 47.79 | 52.83 | 57.83 | 62.83 | 66.84 | 71.84 | 76.84 | 81.89 | 86.89 | 91.89 | 96.89 |
| n min | 8.58 | 10.595 | 13.595 | 15.595 | 18.61 | 23.11 | 27.61 | 32.62 | 37.62 | 42.63 | 47.63 | 52.64 | 57.64 | 62.64 | 66.65 | 71.65 | 76.65 | 81.67 | 86.67 | 91.67 | 96.67 |
| b1 max | 2.73 | 2.73 | 3.73 | 3.73 | 3.73 | 4.73 | 4.73 | 4.73 | 5.73 | 5.73 | 5.73 | 6.72 | 6.72 | 6.72 | 7.72 | 7.72 | 7.72 | 7.72 | 9.72 | 9.72 | 9.72 |
| b1 min | 2.33 | 2.33 | 3.25 | 3.25 | 3.25 | 4.25 | 4.25 | 4.25 | 5.25 | 5.25 | 5.25 | 6.14 | 6.14 | 6.14 | 7.14 | 7.14 | 7.14 | 7.14 | 9.14 | 9.14 | 9.14 |
| h | 1 | 1 | 1 | 1 | 1 | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.75 | 1.75 | 1.75 | 1.75 | 1.75 |
| dc max | 22.05 | 26.05 | 29.05 | 33.25 | 37.25 | 43.25 | 50.25 | 58.5 | 63.5 | 70.5 | 75.5 | 82.75 | 87.75 | 93.75 | 99.75 | 105.75 | 113.75 | 120.75 | 128 | 135 | 144 |
| dc min | 19.95 | 23.95 | 26.95 | 30.75 | 34.75 | 40.75 | 47.75 | 55.5 | 60.5 | 67.5 | 72.5 | 79.25 | 84.25 | 90.25 | 96.25 | 102.25 | 110.25 | 117.25 | 124 | 131 | 140 |
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Application of DIN5406 MB Lock Washers:
DIN 5406 MB Lock Washers are primarily used to mechanically secure DIN 981 locknuts on shafts. The locking tabs provide a positive connection between the washer and nut, making them particularly suitable for assemblies where vibration or rotation could otherwise cause the locknut to loosen.
Rolling Bearing Assemblies
MB Lock Washers are widely used with rolling bearings, bearing housings, and shaft-mounted bearing arrangements where bearings and other components need to be positioned axially. They work together with DIN 981 locknuts to maintain the required position on the shaft.
Motors, Gearboxes and Transmission Equipment
The washer-and-locknut arrangement can be used in electric motors, gearboxes, transmission systems, pumps, and other rotating machinery. The mechanical tab locking method helps prevent the locknut from rotating relative to the shaft during operation.
Rotating Machinery and Shaft Assemblies
DIN 5406 MB Lock Washers are also suitable for shafts, gears, pulleys, couplings, hubs, and other rotating components that require reliable axial positioning. They provide a compact locking solution where a DIN 981 locknut is used to secure the assembly.