Advantages:
–Closed grooes and intgral piston (the seal comprising and elastomeric profile seal ring, two back-up rings and two wear rings). reduced the length of piston, reduced maching costs.
-Good extrusion resistance.
-The grooves are simple and easy to install
-Good sealing effect.
-Low product cost.
| ITEM | D | d1 | H |
| JSDAS | 20 | 11 | 17.7 |
| JSDAS | 25 | 15 | 20 |
| JSDAS | 25 | 15 | 29.1 |
| JSDAS | 25 | 16 | 17.7 |
| JSDAS | 28 | 19 | 17.7 |
| JSDAS | 30 | 21 | 17.7 |
| JSDAS | 32 | 22 | 20.7 |
| JSDAS | 32 | 22 | 29.1 |
| JSDAS | 32 | 24 | 21.9 |
| JSDAS | 35 | 25 | 20.7 |
| JSDAS | 35 | 25 | 29.1 |
| JSDAS | 40 | 24 | 31.1 |
| JSDAS | 40 | 26 | 20.7 |
| JSDAS | 40 | 30 | 29.1 |
| JSDAS | 40 | 30 | 20.5 |
| JSDAS | 42 | 28 | 20.7 |
| JSDAS | 45 | 29 | 31.1 |
| JSDAS | 45 | 31 | 20.7 |
| JSDAS | 45 | 35 | 29.1 |
| JSDAS | 50 | 34 | 31.1 |
| JSDAS | 50 | 34 | 26.7 |
| JSDAS | 50 | 38 | 28.9 |
| JSDAS | 55 | 39 | 31.1 |
| JSDAS | 55 | 39 | 26.7 |
| JSDAS | 56 | 40 | 26.7 |
| JSDAS | 60 | 44 | 26.7 |
| JSDAS | 60 | 44 | 31.1 |
| JSDAS | 60 | 48 | 28.9 |
| JSDAS | 63 | 47 | 26.7 |
| JSDAS | 63 | 47 | 31.1 |
| JSDAS | 63 | 47 | 32.1 |
| JSDAS | 63 | 51 | 28.9 |
| JSDAS | 65 | 50 | 31.1 |
| JSDAS | 65 | 49 | 26.7 |
| JSDAS | 65 | 50 | 31.1 |
| JSDAS | 70 | 50 | 35.1 |
| JSDAS | 70 | 54 | 26.7 |
| JSDAS | 70 | 58 | 28.9 |
| JSDAS | 75 | 55 | 35.1 |
| JSDAS | 75 | 59 | 26.7 |
| JSDAS | 80 | 60 | 35.1 |
| JSDAS | 80 | 62 | 29.7 |
| JSDAS | 80 | 66 | 32.9 |
| JSDAS | 85 | 65 | 35.1 |
| JSDAS | 90 | 70 | 35.1 |
| JSDAS | 90 | 72 | 29.7 |
| JSDAS | 90 | 76 | 32.9 |
| JSDAS | 95 | 75 | 35.1 |
| JSDAS | 100 | 75 | 35.1 |
| JSDAS | 100 | 80 | 38.1 |
| JSDAS | 100 | 82 | 29.7 |
| JSDAS | 100 | 86 | 32.9 |
| JSDAS | 105 | 80 | 35.1 |
| JSDAS | 110 | 85 | 35.1 |
| JSDAS | 110 | 92 | 29.7 |
| JSDAS | 110 | 96 | 32.9 |
| JSDAS | 115 | 90 | 35.1 |
| JSDAS | 115 | 97 | 29.7 |
| JSDAS | 120 | 95 | 35.1 |
| JSDAS | 120 | 106 | 32.9 |
| JSDAS | 125 | 100 | 38.1 |
| JSDAS | 125 | 103 | 36.7 |
| JSDAS | 125 | 108 | 40.9 |
| JSDAS | 130 | 105 | 44.4 |
| JSDAS | 130 | 105 | 38.1 |
| JSDAS | 135 | 110 | 44.4 |
| JSDAS | 135 | 110 | 38.1 |
| JSDAS | 140 | 115 | 44.4 |
| JSDAS | 140 | 115 | 38.1 |
| JSDAS | 140 | 118 | 36.7 |
| JSDAS | 140 | 123 | 40.9 |
| JSDAS | 145 | 120 | 44.4 |
| JSDAS | 145 | 120 | 38.1 |
| JSDAS | 150 | 125 | 44.4 |
| JSDAS | 150 | 125 | 38.1 |
| JSDAS | 150 | 128 | 36.7 |
| JSDAS | 150 | 133 | 40.9 |
| JSDAS | 155 | 130 | 44.4 |
| JSDAS | 160 | 130 | 38.1 |
| JSDAS | 160 | 135 | 44.4 |
| JSDAS | 160 | 138 | 36.7 |
| JSDAS | 160 | 143 | 40.9 |
| JSDAS | 165 | 140 | 44.4 |
| JSDAS | 170 | 145 | 50.8 |
| JSDAS | 175 | 150 | 50.8 |
| JSDAS | 180 | 150 | 48.1 |
| JSDAS | 180 | 155 | 50.8 |
| JSDAS | 185 | 160 | 50.8 |
| JSDAS | 190 | 165 | 50.8 |
| JSDAS | 195 | 170 | 50.8 |
| JSDAS | 200 | 175 | 50.8 |
| JSDAS | 210 | 185 | 50.8 |
| JSDAS | 220 | 190 | 48.1 |
| JSDAS | 220 | 195 | 50.8 |
| JSDAS | 230 | 205 | 50.8 |
| JSDAS | 240 | 215 | 50.8 |
| JSDAS | 250 | 220 | 48.1 |
| JSDAS | 250 | 225 | 50.8 |
| JSDAS | 254 | 224 | 53.8 |
| JSDAS | 260 | 235 | 60.5 |
| JSDAS | 275 | 250 | 44.7 |
| JSDAS | 280 | 250 | 54.4 |
| JSDAS | 280 | 250 | 56.3 |
| JSDAS | 280 | 255 | 50.8 |
| JSDAS | 300 | 275 | 44.7 |
| JSDAS | 320 | 290 | 54.5 |
| JSDAS | 320 | 290 | 61.4 |
| JSDAS | 320 | 295 | 50.8 |
| JSDAS | 360 | 335 | 50.8 |
| JSDAS | 400 | 375 | 50.8 |