Seal Details
Type: 1688
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Sinusoidal wave spring ‘O’-Ring mounted seal with narrow cross-section, short working length, set-screw drive and monolithic head.
Most commonly installed on lobe-rotor pumps, where the twin-shafts and compact pump design make this very compact seal an ideal solution, especially for confined spaces and hygienic applications.
Metric Dimensions
| D0 | Size Code | D1 | D3 | L1 | L2 |
| 16 | 0160 | 28.5 | 27 | 19.1 | 6.3 |
| 24 | 0240 | 35.4 | 34.1 | 19.1 | 7.6 |
| 28 | 0280 | 42 | 39 | 19.1 | 7.6 |
| 30 | 0300 | 42.7 | 41 | 19.1 | 7.6 |
| 32 | 0320 | 44.4 | 42.4 | 19.1 | 7.6 |
| 35 | 0350 | 47.6 | 45.5 | 19.1 | 7.6 |
| 38 | 0380 | 53.9 | 51.8 | 21.1 | 8.1 |
| 50 | 0500 | 63.9 | 61.9 | 21.1 | 8.1 |
| 54 | 0540 | 73.95 | 71 | 22.1 | 9.6 |
| 54.6 | 0546 | 75 | 72 | 22.1 | 9.6 |
| 55 | 0550 | 75 | 72 | 22.1 | 9.6 |
| 63 | 0630 | 83 | 79.3 | 25.8 | 9.1 |
| 75 | 0750 | 100.4 | 96 | 25.8 | 9.1 |
| 80 | 0800 | 104 | 101 | 25.8 | 9.1 |
| 95 | 0950 | 125 | 116 | 25.8 | 9.1 |
| 100 | 1000 | 130 | 121 | 25.8 | 9.1 |
Imperial Dimensions
| D0 | Size Code | D1 | D3 | L1 | L2 |
| 0.625 | 0158 | 28.5 | 27 | 19.1 | 6.3 |
| 0.75 | 0191 | 31.7 | 30 | 19.1 | 6.3 |
| 1.125 | 0286 | 41.2 | 39.5 | 19.1 | 7.6 |
| 1.25 | 0317 | 44.4 | 42.4 | 19.1 | 7.6 |
| 1.375 | 0349 | 47.6 | 45.5 | 19.1 | 7.6 |
| 1.5 | 0381 | 53.9 | 51.8 | 21.1 | 8.1 |
| 1.75 | 0444 | 60.3 | 58.2 | 21.1 | 8.1 |
| 1.875 | 0476 | 63.5 | 61.4 | 21.1 | 8.1 |
| 2 | 0508 | 66.6 | 64.6 | 21.1 | 9.6 |
| 2.125 | 0539 | 73.02 | 71 | 22.1 | 9.6 |
| 2.5 | 0635 | 88.9 | 79.3 | 25.8 | 9.1 |
| 2.75 | 0698 | 95.25 | 90.8 | 25.8 | 9.1 |
| 2.875 | 0730 | 98.43 | 94 | 25.8 | 9.1 |
| 3 | 0762 | 101.6 | 96.9 | 25.8 | 9.1 |