ST-Seals (ST) (Piston packings)

Standard Material: PTFE(PT111)

Profiles (Left section)

ST-2
en_ST

Service range

Standard Material
Material codes Pressure MPa {kgf/㎠} Max. speed
(m/s)
Temperature range
(℃)
PTFE(PT111) ST 25 {250} 3 ー30~100

Characteristics

ST-Seals are combinined seals of S-FLON (PTFE) seals and rubber O-Rings.
ST-Seals provide low friction resistance and eliminate stick slip even at low pressure/speed conditions.
Moderate sealing performance comparing with U-Packings because PTFE plastic seals have higher rigidity and lower elasticity than rubber materials.
Notches introduce pressure energizing seals and activate to obtain the ultimate sealing performance and reliability
●ST type is applicable to wide range of applications and available in abandant dimensions.

Remarks

  • ●Consider adopting split grooves if one-piece groove is technically adverse.
  • ●For applications without back-up rings, set the φD2 side diameter to φD H9/f8.
  • ●SWA-Wear rings are recommended to be installed together with ST-20 and ST-25.
  • ●ST-Seals with the notches for seal energizing pressure available for the ultimate sealing performance and reliability.
  • ●Do not use in single acting.
  • ※JIS standard sequence of surface roughness symbols refer to HERE.

Dimension table

Packings & Groove dimensions(Unit:mm) Part No.
D d H G D1 dw D2 Gw E F L Standard material(PT 111)
20 14 3 3.2 19.6 17 19 3 4 1 3 ST-20
25 19 3 3.2 24.6 22 24 3 4 1 3 ST-25
30 21.5 3.7 4 29.5 26 29 5 6 2 3 ST-30
31.5 23 3.7 4 31 27.5 30 8 6 2 3 ST-31.5
32 23.5 3.7 4 31.5 28 30.5 8 6 2 3 ST-32
35 26.5 3.7 4 34.5 31 33.5 8 6 2 3 ST-35
35.5 27 3.7 4 35 31.5 34 10 6 2 3 ST-35.5
40 31.5 3.7 4 39.5 36 38.5 10 6 2 3 ST-40
45 36.5 3.7 4 44.5 41 43.5 12 6 2 3 ST-45
50 41.5 3.7 4 49.5 46 48.5 12 6 2 3 ST-50
53 44.5 3.7 4 52.4 47 51 16 6 2 3 ST-53
55 46.5 3.7 4 54.4 49 53 16 6 2 3 ST-55
56 47.5 3.7 4 55.4 50 54 16 6 2 3 ST-56
60 51.5 3.7 4 59.4 54 58 16 6 2 3 ST-60
63 49 6.2 6.5 62.4 57 61 16 7 3 4 ST-63
65 51 6.2 6.5 64.4 59 63 16 7 3 4 ST-65
70 56 6.2 6.5 69.4 64 68 20 7 3 4 ST-70
71 57 6.2 6.5 70.4 65 69 20 7 3 4 ST-71
75 61 6.2 6.5 74.4 69 73 20 7 3 4 ST-75
80 66 6.2 6.5 79.4 74 78 20 7 3 4 ST-80
85 71 6.2 6.5 84.4 79 83 20 7 3 4 ST-85
90 76 6.2 6.5 89.4 84 88 25 7 3 4 ST-90
95 81 6.2 6.5 94.4 89 93 25 7 3 4 ST-95
100 86 6.2 6.5 99.4 94 98 25 7 3 4 ST-100
105 91 6.2 6.5 104.4 99 103 25 7 3 4 ST-105
110 96 6.2 6.5 109.4 104 108 30 7 3 4 ST-110
112 98 6.2 6.5 111.4 106 110 30 7 3 4 ST-112
115 101 6.2 6.5 114.4 109 113 30 7 3 4 ST-115
120 106 6.2 6.5 119.4 114 118 30 7 3 4 ST-120
125 111 6.2 6.5 124.3 119 123 30 7 3 4 ST-125
130 116 6.2 6.5 129.3 124 128 30 7 3 4 ST-130
135 121 6.2 6.5 134.3 129 133 30 7 3 4 ST-135
140 126 6.2 6.5 139.3 134 138 40 7 3 4 ST-140
150 136 6.2 6.5 149.3 144 148 40 7 3 4 ST-150
160 146 6.2 6.5 159.3 154 158 40 7 3 4 ST-160
170 150 9 10 169.3 164 168 50 11 4 6 ST-170
180 160 9 10 179.3 174 178 50 11 4 6 ST-180
190 170 9 10 189.3 184 188 50 11 4 6 ST-190
200 180 9 10 199.2 194 198 50 11 4 6 ST-200
210 190 9 10 209.2 204 208 50 11 4 6 ST-210
220 200 9 10 219.2 214 218 60 11 4 6 ST-220
224 204 9 10 223.2 218 222 60 11 4 6 ST-224
230 210 9 10 229.2 224 228 60 11 4 6 ST-230
240 220 9 10 239.2 234 238 60 11 4 6 ST-240
250 230 9 10 249.2 244 248 60 11 4 6 ST-250
260 240 9 10 259.2 252 257 60 11 4 6 ST-260
270 250 9 10 269.2 262 267 60 11 4 6 ST-270
280 260 9 10 279.2 272 277 60 11 4 6 ST-280
290 270 9 10 289.2 282 287 60 11 4 6 ST-290
300 280 9 10 299.2 292 297 60 11 4 6 ST-300
310 290 9 10 309.2 302 307 70 11 4 6 ST-310
320 300 9 10 319.2 312 317 70 11 4 6 ST-320
340 320 9 10 339.2 332 337 70 11 4 6 ST-340
350 330 9 10 349.2 342 347 70 11 4 6 ST-350
360 340 9 10 359.2 352 357 70 11 4 6 ST-360
375 355 9 10 374.2 367 372 70 11 4 6 ST-375
380 360 9 10 379.2 372 377 70 11 4 6 ST-380
400 380 9 10 399.2 392 397 70 11 4 6 ST-400
  • ★Orders and inquiries are acceptable by part numbers. Part numbers marked ※ have been changed each part numbers. Please check HERE for the previous part number.
  • ★Part numbers in blue letters are the products in stock.
  • ★Packings with the part numbers in light Italic require the confirmation of their availability prior to ordering. These items are subject to the abolishment without notice. Reclamation of an abolished product requires producing the new tooling at your expense.
  • ★ST-Seals are made-to-order products. ST-Seals for inner slide rods and other shapes are available upon request.
  • ★Packings are adequately packaged for the optimum storage. Refer to Cautions for the handling and
  • ★Performance and material tests on packing and seals are also available. Please contact us for more information.