O-Ring Size Chart | Ada Kauçuk

The tables below are organised by cross-section. First measure the cross-section of your O-ring, then find your size in the inner-diameter list of that series. The outer diameter is not listed separately; it is calculated as inner diameter + 2 × cross-section.

These are the sizes we actually supply — not the complete standard tables. To search directly, enter the inner diameter and cross-section in the size finder to search within a tolerance.

O-rings and X-rings — inner diameter and cross-section are enough. The outer diameter follows from these two.

Seals, guide rings, bushings — three dimensions needed: inner diameter, outer diameter and height.

Cross-section series

Jump to your cross-section:

1 mm
1.5 mm
1.6 mm
1.78 mm
1.9 mm
2 mm
2.4 mm
2.5 mm
2.62 mm
3 mm
3.1 mm
3.5 mm
3.53 mm
4 mm
5 mm
5.33 mm
5.7 mm
6 mm
6.99 mm
8 mm
8.4 mm
8.6 mm
10 mm

1 mm cross-section

metric series

72 sizes · ID 1–50 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75 Shore

1 1.5 1.8 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 14 14.5 15 15.5 16 16.5 17 17.5 18 19 20 21 21.5 22 22.5 23 23.5 24 24.5 25 25.5 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

1.5 mm cross-section

metric series

106 sizes · ID 1–100 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

1 1.5 1.85 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5 22 22.5 23 23.5 24 24.5 25 26 26.5 27 27.5 28 29 30 31 32 33 33.5 34 35 36 36.5 37 38 39 39.5 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 77 79 82 86 95 100

1.6 mm cross-section

special size

32 sizes · ID 3.1–37.1 mm · NBR (nitrile rubber) · 70/90 Shore

3.1 4.1 4.9 5.1 6.1 7.1 8.1 9.1 10.1 11.1 12.1 13.1 14.1 15.1 16.1 17.1 18.1 19.1 20.1 21.1 22.1 23.1 24.1 25.1 26.1 27.1 28.1 29.1 30.1 32.1 35.1 37.1

1.78 mm cross-section

AS568 series

113 sizes · ID 1.78–225 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

1.9 mm cross-section

special size

41 sizes · ID 2.4–18 mm · NBR (nitrile rubber) · 70/90 Shore

2.4 2.6 2.8 3.2 3.4 3.8 4.2 4.8 5.2 5.8 6.2 6.4 6.5 6.6 6.7 6.8 7.2 7.8 8 8.2 8.5 8.6 8.7 8.8 8.9 9 9.2 9.8 10 10.2 10.8 12.2 12.7 12.8 13.2 13.8 14.2 14.8 15.2 17.2 18

2 mm cross-section

metric series

213 sizes · ID 1–260 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), PTFE, Silicone (VMQ) · 70/75/90 Shore

1 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5 22 23 23.5 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.5 30 31 31.5 32 33 33.5 34 34.5 35 35.5 36 36.5 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45 45.5 46 46.5 47 47.5 48 48.5 49 49.5 50 51 52 52.5 53 54 55 56 57 58 59 60 61 62 62.5 63 64 65 66 66.5 67 68 69 70 70.5 71 72 73 74 74.5 75 76 77 78 79 79.4 79.5 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 94.5 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 109.5 110 111 113 114 115 116 118.8 119.5 120 121 122 123 124 125 126 128 129 130 131 131.5 132 134.5 135 136 138 139.5 140 142 145 146 148 150 151 155 156 157 160 165 170 175 176 180 185 190 200 210 212 215 218 260

2.4 mm cross-section

special size

164 sizes · ID 1.3–95.3 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

1.3 2.2 2.3 3.3 3.6 4.3 4.6 5.3 5.6 6.3 6.6 7.3 7.6 8.3 8.6 8.9 9.3 9.6 9.8 10.2 10.3 10.6 10.8 11.3 11.6 11.8 12.3 12.6 12.8 13.3 13.6 13.8 14.3 14.6 14.8 14.9 15.2 15.3 15.6 15.8 16.3 16.6 16.8 17.3 17.6 17.8 18.3 18.6 18.8 19.3 19.6 19.8 20.3 20.6 20.8 21.2 21.3 21.6 21.8 22.3 23.3 23.4 24.3 24.6 25.2 25.3 25.6 26.3 27.2 27.3 27.4 27.6 27.7 28.2 28.3 28.8 29.3 29.6 30.2 30.3 31.2 31.3 31.6 32.2 32.3 32.6 33.2 33.3 34.3 34.6 35.2 35.3 36.2 36.3 37.2 37.3 37.6 38.2 38.3 39.2 39.3 39.6 40.2 40.3 41.2 41.3 41.6 42.2 42.3 43.2 43.3 44.2 44.3 44.6 45.2 45.3 45.6 46.2 47.2 47.3 47.6 48.3 49.3 49.6 49.7 50.2 51.2 51.6 52.2 52.6 53.2 54.2 54.6 55.2 56.2 57.2 57.6 58.2 59.2 59.3 59.6 60.2 61.2 61.6 62.2 63.2 64.2 64.6 65.2 66.2 67.2 68.2 69.2 69.6 70.2 73.2 74.3 75.2 77.2 80.2 80.6 83.2 93.2 95.3

2.5 mm cross-section

metric series

127 sizes · ID 3–370 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

3 4 5 5.5 6 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 13 13.5 14 14.5 15 15.5 16 16.5 17 18 19 19.5 20 20.5 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 69.5 70 71 72 73 74 74.5 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 105 110 115 120 125 130 131 135 140 145 149 260 283 310 370

2.62 mm cross-section

AS568 series

144 sizes · ID 1.24–349.25 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), PTFE, Silicone (VMQ) · 70/75/90 Shore

1.24 2.06 2.84 3.63 4.42 5.23 6.02 7.3 7.59 8.3 9.19 9.64 9.92 10.78 11.91 12.37 13.1 13.94 13.95 15.08 15.54 15.88 17.12 17.13 17.86 18.72 20.29 20.3 20.63 21.89 22.22 23.47 23.8 23.81 25.07 25.8 26.2 26.64 27.05 27.4 27.69 28.24 28.5 29.82 31.42 32.99 34.59 36.17 37.77 39.34 40.94 40.95 41.25 42.52 44.12 45.69 47.29 48.9 50.47 52.07 53.64 55.25 56.82 58.42 58.5 59.99 61.6 63.17 63.95 64.77 66.34 66.35 67.95 69.52 71.12 72.69 74.3 75 75.87 77.5 78 80 80.6 82.22 83.8 84.52 86 87.3 88.57 90 92 94.92 98.4 100.8 101.27 103 106 107.2 107.62 108 109.7 112.5 113.97 118 120.32 122.05 123.9 125 126.67 130 133.02 137.72 139.37 139.38 142.9 145.72 147.29 152.07 158.41 158.42 162 164.77 171.12 177.47 181 183.82 185 190.17 192 192.24 196.52 196.53 202.87 209.22 209.23 215.57 219.1 221.92 228.27 234.62 240.97 247.32 269.4 349.25

3 mm cross-section

metric series

330 sizes · ID 2–471 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

2 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14 14.5 15 15.5 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5 22 22.5 23 23.5 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.5 30 31 31.5 32 32.5 33 33.5 34 34.5 35 35.5 36 36.5 37 37.5 38 38.5 39 39.5 40 40.5 41 42 43 44 44.5 45 45.5 46 47 48 48.5 49 50 51 52 53 54 55 56 57 58 59 60 60.5 61 62 63 64 65 66 67 68 69 70 71 71.88 72 73 74 74.5 75 76 77 78 79 79.5 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 109.5 110 111 112 113 114 114.5 115 116 117 118 119 119.5 120 121 122 123 124 124.5 125 126 127 128 129 129.5 130 132 134 134.5 135 136 137 137.5 138 139 140 141.5 142 142.5 143 144 145 146 147 148 149 149.5 150 152 153 154 154.4 154.5 155 156 157 158 159 159.5 160 161 162 164 164.5 165 168 169 169.5 170 171 172 173 174 175 178 179 179.5 180 181 182 183.5 184 184.5 185 188 189 190 191 192 193 194 194.5 195 196 197 198 199.5 200 203 204 205 207 208 209.5 210 212 213 215 216 218 219.5 220 225 230 232 233 234.5 235 236 238 240 242 245 250 251 253 255 257 260 265 270 273 274 275 280 284 285 287 289 290 294 295 300 304 305 309 310 314 315 320 324 325 330 335 340 345 350 354 355 360 365 370 375 380 385 390 395 400 405 412 415 420 425 430 440 460 470 471

3.1 mm cross-section

special size

134 sizes · ID 11.8–253.8 mm · NBR (nitrile rubber) · 90 Shore

11.8 13.8 14.4 14.8 15.8 16.8 17.8 18.8 19.4 20.8 21.8 22.5 22.8 23.8 24.4 24.8 25.8 26.5 27.4 27.8 28.8 29.4 29.8 30 30.8 31.8 33.8 34.4 35.8 36.8 37.4 37.8 38.8 39.4 39.5 40.8 41.8 43.8 44.4 45.8 46.8 47.4 48.8 49.4 49.8 50 53.8 54.4 55.8 56.8 57.4 57.8 58.8 59.4 60.4 61.8 62.4 63.8 64.4 66.4 67.4 68.8 69.4 73.8 74.4 78.8 79.4 83.8 84.4 88.8 89.4 90 93.8 94.4 98.8 99.4 103.8 104.4 108.8 109.4 113.8 114.4 118.8 119.4 123.8 124.3 124.4 128.8 129.4 133.8 134.4 138.8 139.4 143.8 144.3 144.4 144.8 147.8 148.8 149.4 150 153.8 154.4 155 155.4 158.8 159.4 159.8 163.8 164.4 168.8 169.4 170 173.8 174.4 178.8 179.4 180 183.8 184.4 185 189.4 193.8 194.3 198.8 199 203.8 204.4 208.8 209.4 210 213.8 224.4 253.8

3.5 mm cross-section

metric series

136 sizes · ID 15–280 mm · NBR (nitrile rubber), Silicone (VMQ) · 70/90 Shore

15 16 17 20 21 21.7 22.1 22.7 23.7 24 24.5 24.7 25.7 26 26.7 27 27.7 28 28.7 29 29.2 29.7 30 30.7 31 31.2 31.7 32 32.7 33 33.7 34 34.7 35 35.2 35.7 36 36.5 37 37.7 38 38.7 39 39.7 40 40.7 41 41.7 42 43 43.7 44 44.7 45 45.7 46 46.7 47 47.7 48 48.7 49 49.7 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 64.6 65 67.6 68 70 71 73 75 77 78 80 82 83 84 85 87 87.6 89.6 90 91 93 94.6 97.6 100 105 109.6 111.6 113.6 114.7 117.6 118.6 120 124.6 129.6 133 134.5 139.5 140 144.7 149.7 153 163 165 168 170 174 177 180 183 194 195 200 205 210 255 273 274 280

3.53 mm cross-section

AS568 series

193 sizes · ID 3.05–565 mm · EPDM, FKM / Viton (fluoroelastomer), NBR (nitrile rubber), PTFE, Silicone (VMQ) · 70/75/90 Shore

3.05 4.34 4.8 5.94 6.35 7.15 7.52 8 8.55 9.12 10.69 11.15 12.29 13.87 15.47 15.5 16 17.04 18 18.64 20.22 21.82 23.39 24.2 24.99 25.8 26.57 26.58 27.7 27.8 28.17 29.74 29.75 31.34 32.92 34.52 34.92 35.7 36.09 36.1 37.69 37.7 39.69 40.25 40.87 41.28 42.86 43 44.04 44.45 45.25 46.04 47.22 47.63 48.45 48.7 49.2 49.21 50.39 50.8 52.39 53.57 53.97 54.23 54.8 55.56 56.74 57.15 58.74 58.78 59.92 60.33 61.91 63.09 63.5 65.09 65.1 66.27 66.67 68.26 69.44 69.85 71.44 72.62 73.02 73.03 74.6 74.61 75.79 77 78.97 79.63 80 82.14 85.32 88.49 90 91.67 94.7 94.84 96.44 98.02 99.6 101.19 101.2 103 104.37 107.54 109 110.72 112.3 113.89 113.9 114.5 117.07 120.24 123.42 125 126.59 126.6 128 129.77 132.94 136.12 139.3 142.47 145.64 148.8 148.82 149.23 151.99 155 158.34 160 164.69 164.7 170 171.04 171.05 174.2 177.39 179.39 181.84 183.74 183.75 186.71 188.75 190.09 190.1 195 196.44 200 202.79 202.8 207 209.14 215.49 219 221.84 228.19 230.3 234.49 234.54 240.89 247.24 253.59 260.5 266.29 266.3 269 278.99 279 288 291.69 304.39 314.83 315.5 319.2 323.45 329.79 340 355.19 355.2 367.79 380.59 380.6 390.6 400 405.26 430.66 456.06 490 565

4 mm cross-section

metric series

288 sizes · ID 3–520 mm · EPDM, FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 132 133 134 135 137 138 139 140 142 143 144 145 146 147 148 150 151 152 155 157 159 160 162 164 165 167 168 170 172 174 175 177 178 179 180 182 185 187 190 192 194 195 197 200 202 203 205 206 207 210 211 212 215 217 218 220 222 225 227 228 230 232 234 235 237 240 242 243 245 247 250 252 255 257 260 262 265 266 267 270 272 273 275 277 280 282 284 285 287 290 292 295 297 300 302 305 307 310 312 315 317 320 322 324 325 327 329 330 332 335 337 340 342 345 347 350 352 355 357 360 362 365 367 370 372 375 377 380 382 385 387 390 392 395 400 402 405 410 412 415 420 422 425 430 432 435 440 442 445 450 452 455 460 462 470 472 490 495 500 510 520

5 mm cross-section

metric series

207 sizes · ID 5–605 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), PTFE, Silicone (VMQ) · 70/75/90 Shore

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 102 105 107 109 110 115 117 120 122 125 127 130 135 140 143 145 147 148 150 152 155 157 160 165 170 175 180 182 185 190 193.5 195 196 200 205 210 214 215 219 220 222 225 230 233 235 240 245 250 254 255 260 265 270 272 275 278 280 285 288 290 295 300 305 310 315 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 400 405 410 415 420 425 430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 518 520 560 590 600 605

5.33 mm cross-section

AS568 series

150 sizes · ID 10.46–658.88 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

10.46 12.07 13.64 15.24 16.81 18.42 19.99 21.59 23.16 24.77 26.34 27.94 27.95 29.51 31.12 32.69 34.29 37.47 38.7 40.64 40.65 42.82 43.82 46.99 47 50.16 50.17 53.34 54.9 56.52 58.5 59.69 61.87 62.87 64.04 66.04 69.22 72.39 72.4 74.63 75.57 78.74 79.77 81.92 85.09 88.27 89.69 91.44 94.61 94.62 97.79 97.8 100 100.97 104.14 107.32 109.54 110.49 110.72 113.67 115 116.84 118 120.02 120.65 120.7 123.19 123.8 125 126.37 129.54 130.18 132.72 133.35 135 135.89 136.53 139.07 139.7 142.24 142.88 145.42 146.05 146.23 148.59 149.23 151.77 154.3 154.94 155 158.12 160 161.3 164.47 164.5 166.5 167.7 170.82 174 177.17 180.85 183.52 189.87 194.94 196.22 202.57 205 208.92 215.27 218 221.62 227.97 234.32 234.55 240.67 247.02 250.2 253.3 253.37 260 266.07 278.77 291.47 304.17 316.87 318.7 324.9 329.55 329.57 338.15 354.97 372 380.37 390 393.07 405.26 430.66 456.06 481.46 495 506.81 523.21 532.21 532.25 557.61 582.68 608.08 633.48 658.85 658.88

5.7 mm cross-section

special size

277 sizes · ID 16.6–588.6 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

16.6 18.6 20.6 23.6 28.6 28.93 30.6 33.6 39.2 40 41.2 41.6 43.6 44.3 45.2 45.3 45.6 46.6 47.2 47.3 47.6 48.6 49.2 49.3 49.6 50.6 51.2 51.3 51.6 52.3 52.6 53.6 54.3 54.6 55.3 55.6 56.6 57.2 57.3 57.6 58.6 59.3 60.6 61.6 62.1 62.3 62.6 63.6 64 64.3 65.6 66.6 67.3 67.6 68.6 69.2 69.3 70.6 71.6 72.6 73.6 74.2 74.3 75.6 76.6 77.2 78.6 79.2 79.3 81.2 82.6 83.6 84.2 84.3 85.6 86.6 87.3 88.6 89.2 89.3 90.6 93.6 94.2 94.3 97.3 98.6 99.2 99.3 101.6 102.6 103.6 104.2 104.3 108.6 109.3 111.6 113.6 114.3 116.6 117.6 118.6 119.2 119.3 123.6 124.2 124.3 128.6 129.2 129.3 131.6 133.6 134.2 134.3 138.6 139.3 143.6 144.2 144.3 146.6 148.6 149.2 149.3 153.6 154.3 158.6 159.3 163.6 164.3 168.6 169.3 173.6 174.3 178.6 179.3 183.6 184.3 188.6 189.2 189.3 193.6 194.3 198.6 199.3 203.6 204.2 204.3 208.6 209.3 213.6 214.2 214.3 218.6 219.3 223.2 223.3 223.6 224.2 224.3 228.6 229.3 233.6 234.3 238.6 239.27 239.3 243.3 243.6 244.3 248.6 249.3 253.6 254.3 258.6 259.3 263.3 263.6 264.3 268.6 269.3 274.3 274.6 278.6 279.3 283.6 284.3 288.6 289.3 293.6 294.3 299.3 303.6 304.3 304.4 308.6 309.3 313.6 314.2 314.3 318.6 319 319.3 319.4 323.6 324.3 328.6 329.3 334.3 338.6 339.3 343.6 344.3 346.6 348.6 349.3 354.2 355.2 358.6 359.3 364.3 368.5 368.6 369.3 373.6 374.3 378.6 379.3 383.6 384.3 388.6 389.3 393.6 398.6 399.2 403.6 408.6 409.2 409.3 413.6 418.6 419.3 423.6 428.6 429.3 433.6 438.6 439.3 443.6 449.3 449.6 453.6 458.6 459.3 463.6 468.6 469.3 473.6 478.6 479.2 488.6 489.4 493.6 498.6 499.3 503.6 508.6 513.6 518.6 528.6 533.6 538.6 543.6 558.6 563.6 568.6 573.6 578.6 588.6

6 mm cross-section

metric series

260 sizes · ID 6–580 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

6 7 8 10 11 12 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 108 110 113 114 115 118 120 121 123 124 125 128 130 133 135 138 140 142 143 145 148 150 152 153 154 155 158 160 163 165 168 170 172 173 175 178 180 181 183 185 188 190 192 193 195 198 200 203 205 208 210 212 213 215 218 220 223 225 228 230 233 235 238 240 243 245 248 250 253 255 258 260 263 265 268 270 275 278 280 283 285 288 290 293 295 298 300 303 305 308 310 315 318 320 323 325 328 330 333 335 338 340 343 345 348 350 353 355 358 360 363 365 368 370 373 375 378 380 383 385 388 390 393 395 400 403 405 408 410 415 418 420 425 430 435 440 445 450 452 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550 555 560 580

6.99 mm cross-section

AS568 series

136 sizes · ID 31.12–658.88 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75/90 Shore

31.12 34.29 35.1 37.47 40.64 43.82 46.99 47.63 50.17 53.34 54.9 56.52 58 59.69 61.6 62.87 63.5 64.25 66.04 69.22 72.39 75.57 78.74 79 81.92 85.1 86.5 87.45 88.25 90 91.45 93 94 94.62 97.79 99 100.97 104.14 107.3 110.49 113.67 114.7 115 116.84 120.02 123.19 124.6 126.37 128 129.54 129.84 132.72 134.5 134.72 135.89 139.07 142.24 143.8 145.42 147 148.59 148.6 151.77 155.6 158.12 159.5 161.02 161.9 164.47 166.7 168.3 170.82 171.6 174.6 177.17 181 183.52 185.57 187.3 189.87 193.7 196.22 199.8 202.57 207 208.92 215.27 215.3 220 221.62 224.79 227.97 234.32 234.54 240.67 247 253.37 259.7 266.07 272.4 274.4 278.77 285.1 291.47 297.8 304.1 304.17 310.5 316.87 323.2 329.57 335.9 342.27 350 354.97 367.67 380.37 393.07 405.26 417.96 430.66 435 443.36 456.06 468.76 481.16 481.46 494.16 506.86 532.26 557.66 582.68 583.68 608.08 633.48 658.88

8 mm cross-section

metric series

42 sizes · ID 24–660 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75 Shore

24 51.8 59 66 72 73 74 80 82 90 98 108.5 112 120 130 150 159 160 164 170 174 190 199 200 219 240 250 265 279 290 299 315 322 325 332 335 344 354 358 365 473 660

8.4 mm cross-section

special size

53 sizes · ID 144.5–399.5 mm · NBR (nitrile rubber) · 70/90 Shore

8.6 mm cross-section

special size

56 sizes · ID 72.8–557.8 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber) · 70/75/90 Shore

10 mm cross-section

metric series

28 sizes · ID 52.95–580 mm · FKM / Viton (fluoroelastomer), NBR (nitrile rubber), Silicone (VMQ) · 70/75 Shore

52.95 65 70 80 98 110 120 125 130 140 145 150 155 160 165 169 170 175 180 185 188 210 230 280 285 341 520 580

Other cross-sections

Special cross-sections with only a few sizes. Use the size finder for details.

Frequently Asked Questions

About O-ring sizes

How is an O-ring size read?

An O-ring is defined by two dimensions: inner diameter and cross-section. “45 × 3” means an O-ring with a 45 mm inner diameter and a 3 mm cross-section. The outer diameter is not measured separately; it is inner diameter + 2 × cross-section — 51 mm in this example.

What do the cross-section series in the chart mean?

O-rings are grouped into series by cross-section. Decimal values such as 1.78 · 2.62 · 3.53 · 5.33 · 6.99 mm come from the inch-based AS568 standard. Whole numbers such as 2 · 3 · 4 · 5 · 6 mm are metric (DIN 3771 / ISO 3601) series. The value you get when measuring your part's cross-section largely tells you which system it comes from.

What if my size is not in the chart?

This chart shows the sizes we actually supply. Contact us for sizes that are not listed; for non-standard sizes we can consider making them from cord on site or sourcing them specially.

Which material should I choose?

The fluid the seal is in contact with determines the material. NBR is chosen for mineral-oil and hydraulic-oil systems, Viton (FKM) for high temperatures and aggressive chemicals, EPDM for water and steam, and silicone for static applications that need food compatibility. EPDM must not be used with mineral oil.

What is the difference between 70, 75 and 90 Shore?

The Shore value is the hardness of the elastomer. 70 Shore is the general-purpose standard and fills surface irregularities well. 90 Shore resists extrusion into the clearance gap at high pressure but needs a better surface finish. 75 Shore is a common intermediate hardness for Viton seals.

Couldn't find your size?

Send us the inner diameter, cross-section and fluid, and we'll reply with a suitable material and size. For a detailed explanation of O-ring selection see our O-ring size and material guide, and for the product group see the O-rings category.

Open the size finder +90 312 385 61 11