Specs/CAD
Unit : mm
| Part Number | Nominal | D | d | B | C | t1 | t2 | t | Reference tightening torque （N・m） |
Qty per pack | Mass （g） |
CAD Download |
RFQ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SWAS-6-EW | 6 | 12 | 6.05 | 11.6 | 13.3 | 2.65 | 2.9 | 3.9 | 10 | 100 | 1.5 | CAD | RFQ |
| SWAS-8-EW | 8 | 17 | 8.1 | 15 | 17.3 | 3.3 | 3.9 | 5.1 | 28 | 100 | 3.5 | CAD | RFQ |
| SWAS-10-EW | 10 | 21 | 10.2 | 19.8 | 22.8 | 4.05 | 4.8 | 6.2 | 55 | 100 | 7.2 | CAD | RFQ |
| SWAS-12-EW | 12 | 24 | 12.2 | 22 | 25.4 | 4.5 | 6 | 7.5 | 90 | 100 | 11 | CAD | RFQ |
Dimension Drawing
Eccentric Lock Washer TM Comparison test: Anti loosening performance ※without sound
Related Services
Material/Finish
| SWAS-EW | |
|---|---|
| Receiving Washer | SUS304 |
| Eccentric Washer | SUS304 |
Application
Vibration resistant treatmentStructure
- Tightening hexagon nuts causes eccentric washers to bite into bolts.
- Receiving washers press hexagon nuts into bolts.
- Receiving washers then press hexagon nuts upward, increasing friction between hexagon nuts and bolts and preventing loosening.
Characteristics
- Vibration resistant treatment effect can be achieved simply by using commercially available hexagon nuts.
- Hexagon nuts can be tightened by hand until tightening force applies, for simple mounting.
- Use the receiving washer and eccentric washer as a set.
- Passes NAS-type vibration tests (NAS3350).
- Vibration resistant treatment effect has also been confirmed with the Junker test.
Test conditions
Bolt size: M10-40
Distance between washer surfaces: 24mm
Amplitude: ±0.43mm
Vibration: 3.3Hz
Test time: 180 sec
Precautions for Use
- Dedicated for hexagon nuts. Do not use on head side of hexagon head bolts.
- After tightening, use bolts with length sufficient to ensure screw thread pitches of 3 or more extending beyond the hexagon nuts.
- Do not use with other washers such as plain washers.
- When using half-thread bolts, confirm that the eccentric washer is in the screw thread part.
- Bolt damage may ensue due to product properties.
Mounting Method
- Mount eccentric washers with convex side upward. Figure 1
- Mount receiving washers with concave side upward. Figure 2
- Screw in hexagon nuts until they lightly contact receiving washers. Figure 3
- Check that receiving washers and hexagon nuts are mated, and tighten. Figure 4
