Hydraulic Seals - Compact Double Acting
M78 and M79 are compact double acting seals for rod and piston seals. They can replace O-ring seals, without hardware modifications, to improve performance for existing equipment.
Unless space is a premium, it is advisable to use larger section seals such as M74/M75 if possible.
| Advantages | Surface Roughness | Operating Ranges |
|---|---|---|
|
|
|
| Type |
Groove L1 + 0.2 |
Type | GROOVE WIDTH L2 + 0.2 |
ROD ØC f8/h9 |
Groove ØD H9 |
Groove Depth X |
Radius R Max |
Diametral Clearance E Max |
O-RING | |
|---|---|---|---|---|---|---|---|---|---|---|
| Series | C/S | |||||||||
| M78A | 2.40 | M78F | 3.8 | 4 - 9.9 | C + 2.9 | 1.45 | 0.4 | 0.13 | 000 | 1.78 |
| M78B | 3.60 | M78G | 4.65 | 10 - 19.9 | C + 4.5 | 2.25 | 0.4 | 0.13 | 100 | 2.62 |
| M78C | 4.80 | M78H | 5.70 | 20 - 39.9 | C + 6.2 | 3.10 | 0.6 | 0.15 | 200 | 3.53 |
| M78D | 7.10 | M78J | 8.50 | 40 - 119.9 | C + 9.4 | 4.70 | 0.8 | 0.17 | 300 | 5.33 |
| M78E | 7.10 | M78K | 11.20 | 120 - 400.9 | C + 12.2 | 6.10 | 0.8 | 0.25 | 400 | 7.00 |
| Type |
Groove L1 + 0.2 |
Type | GROOVE WIDTH L2 + 0.2 |
BORE ØA H9 |
Groove ØB h9 |
Groove Depth X |
Radius R Max |
Diametral Clearance E Max |
O-RING | |
|---|---|---|---|---|---|---|---|---|---|---|
| Series | C/S | |||||||||
| M79A | 2.40 | M79F | 3.8 | 8 - 13.9 | A -2.9 | 1.45 | 0.4 | 0.13 | 000 | 1.78 |
| M79B | 3.60 | M79G | 4.65 | 14 = 24.9 | A -4.5 | 2.25 | 0.4 | 0.13 | 100 | 2.62 |
| M79C | 4.80 | M79H | 5.70 | 25 - 45.9 | A -6.2 | 3.10 | 0.6 | 0.15 | 200 | 3.53 |
| M79D | 7.10 | M79J | 8.50 | 46 - 124.9 | A -9.4 | 4.70 | 0.8 | 0.17 | 300 | 5.33 |
| M79E | 9.50 | M79K | 11.20 | 125 - 400.9 | A -12.2 | 6.10 | 0.8 | 0.25 | 400 | 7.00 |
