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KASTAS气封K25是一种双作用活塞密封，由一种采用特殊生产方法硫化弹性丁腈橡胶的钢板组成。产品优势:可以安装完整的活塞，尺寸范围广，由于密封唇几何形状，低摩擦和平稳运行，无需使用额外的密封元件即可轻松固定在活塞杆上，使用寿命长，经济的密封解决方案。主要应用于铁和铝气缸。关于K25的安装：K25被推到夹紧法兰上的活塞杆上，朝向杆并通过紧固固定。必须固定螺母。滑动表面和气缸孔应加油，在安装过程中不得与密封元件发生反应。在行程末端必须采取特殊预防措施，以避免损坏密封唇。
| 订货号 | D(H11)*d(h9)*B | d1 | s1 | s |
| K25-020 | 20*5.2*8 | 12.2 | 1 | 1.4 |
| K25-025 | 25*8*12 | 14.5 | 3 | 4 |
| K25-025/2 | 25.4*6.35*12.7 | 9.4 | 2.5 | 3.5 |
| K25-026 | 26*8*12 | 15.5 | 3 | 4 |
| K25-028 | 28.58*6.35*12.7 | 12.58 | 2.5 | 3.5 |
| K25-031 | 31.75*6.35*14.29 | 15.75 | 2.5 | 3.5 |
| K25-032 | 32*8*15 | 16 | 3 | 4 |
| K25-035 | 35*8*15 | 19 | 3 | 4 |
| K25-036 | 36*8*15 | 20 | 3 | 4 |
| K25-040 | 40*10*18 | 23 | 4 | 5 |
| K25-044 | 44.45*6.35*14.28 | 23.46 | 2.5 | 3.5 |
| K25-050 | 50*10*18 | 29 | 4 | 5 |
| K25-050/2 | 50*16*20.5 | 25 | 4 | 5 |
| K25-050/7 | 50.8*9.53*15.88 | 15.75 | 3 | 4 |
| K25-057 | 57.15*9.53*15.88 | 34.65 | 3 | 4 |
| K25-060 | 60*12*22 | 36.8 | 4 | 5 |
| K25-060/1 | 60.33*9.53*15.88 | 37.83 | 3 | 4 |
| K25-062 | 62*15*22 | 39 | 5 | 6 |
| K25-063 | 63*12*22 | 40.5 | 5 | 6 |
| K25-069 | 69.85*9.53*19.05 | 47.35 | 4 | 5.5 |
| K25-070 | 70*12*22 | 47 | 5 | 6 |
| K25-073 | 73.03*9.53*19.05 | 48.03 | 4 | 5.5 |
| K25-075 | 75*15*22 | 52 | 5 | 6 |
| K25-075/1 | 75*12*22.5 | 52 | 5 | 6 |
| K25-076 | 76.2*12.7*19.05 | 51.2 | 4 | 5 |
| K25-080 | 80*16*25 | 55 | 5 | 6.5 |
| K25-080/4 | 80*16*22.5 | 55.2 | 5 | 6.5 |
| K25-080/5 | 80*20*22.5 | 55.2 | 5 | 6.5 |
| K25-082 | 82.55*12.7*19.05 | 57.55 | 4 | 5 |
| K25-088 | 88.9*12.7*22.23 | 63.9 | 5 | 6 |
| K25-090 | 90*16*25 | 65 | 5 | 6.5 |
| K25-100 | 100*16*25 | 75 | 5 | 6.5 |
| K25-100/4 | 100*12*25 | 75 | 5 | 6.5 |
| K25-100/6 | 100*20*26 | 75 | 5 | 6.5 |
| K25-107 | 107.95*12.7*22.23 | 82.96 | 5 | 6 |
| K25-110 | 110*18*25 | 85 | 6 | 7.5 |
| K25-114 | 114.3*19.05*22.23 | 79.3 | 5 | 6 |
| K25-125 | 125*20*30 | 90 | 8 | 10 |
| K25-125/1 | 125*20*26 | 90 | 6 | 7.5 |
| K25-127 | 127*19.05*25.4 | 92 | 6 | 7.5 |
| K25-130 | 130*20*29 | 95 | 8 | 10 |
| K25-140 | 140*20*30 | 95 | 10 | 12 |
| K25-150 | 150*20*30 | 105 | 10 | 12 |
| K25-152 | 152.4*19.05*25.4 | 107.4 | 6 | 7.5 |
| K25-160 | 160*27*31 | 115 | 10 | 12 |
| K25-160/3 | 160*20*30 | 130 | 10 | 10.7 |
| K25-165 | 165.1*19.05*25.4 | 120.1 | 6 | 7.5 |
| K25-180 | 180*27*31 | 135 | 10 | 12 |
| K25-190 | 190*20*30 | 160.4 | 10 | 12 |
| K25-200 | 200*27*35 | 150 | 12 | 15 |
| K25-200/5 | 200*30*35 | 150 | 8 | 10.6 |
| K25-202 | 202.2*31.75*38.1 | 150.5 | 10 | 11 |
| K25-250 | 250*30*35 | 200 | 12 | 16.5 |
| K25-253 | 253*44.45*41.27 | 180 | 12 | 15 |
| K25-320 | 320*36*40 | 278.5 | 15 | 18.6 |
| K25-400 | 400*40*50 | 320 | 20 | 23 |