O-Ring Size Chart

Download Our Color O-Ring Chart PDF File


To locate the O-ring Dash Number, find the inside diameter (I.D.) in the left-hand column, then read across to find the thickness (cross-section). The O-ring Dash Number is at the intersection of the row and column.



*Cross Sections for 001 is .040", 002 is .050", 003 is .060".

Cross sections shown are nominal fractions. Actual Cross-sections are:

1/16" Nominal = .070" actual
3/32" Nominal = .103" actual
1/8" Nominal = .139" actual
3/16" Nominal = .210" actual
1/4" Nominal = .275" actual


Cross Section
I.D. 1/16 3/32 1/8 3/16 1/4
1/32
3/64
1/16
5/64
3/32
1/8
 001*
002*
003*
004
005
006

102

103
104


5/32
3/16
7/32
1/4
 007
008
009
010
 105
106
107
108
201

202

5/16
3/8
7/16
1/2
 011
012
013
014
 109
110
111
112
 203
204
205
206

309
310
9/16
5/8
11/16
3/4
 015
016
017
018
 113
114
115
116
 207
208
209
210		 311
312
313
314
13/16
7/8
15/16
1
 019
020
021
022
 117
118
119
120
 211
212
213
214		 315
316
317
318
1-1/16
1-1/8
1-3/16
1-1/4
 023
024
025
026
 121
122
123
124
 215
216
217
218		 319
320
321
322
1-5/16
1-3/8
1-7/16
1-1/2
 027
028

029
 125
126
127
128
 219
220
221
222		 323
324

325
400

401
1-9/16
1-5/8
1-11/16
1-3/4
030

031
 129
130
131
132
223

224
326

327
402

403
1-13/16
1-7/8
1-15/16
2
2-1/16
2-1/8
032

033

034		 133
134
135
136
137
138
225

226

227
328

329

330
404

405

406


Cross Section
I.D. 1/16 3/32 1/8 3/16 1/4
4-1/4
4-3/8
4-1/2
4-5/8
 046

047

 156

157

 244
245
246
247		 347
348
349
350		 423
424
425
426
4-3/4
4-7/8
5
5-1/8
 048

049

 158

159

 248
249
250
251		 351
352
353
354		 427
428
429
430
5-1/4
5-3/8
5-1/2
5-5/8
 050



 160

161

 252
253
254
255		 355
356
357
358		 431
432
433
434
5-3/4
5-7/8
6
6-1/4
6-1/2
6-3/4



162

163
164
165
166		 256
257
258
259
260
261		 359
360
361
362
363
364		 435
436
437
438
439
440
7
7-1/4
7-1/2
7-3/4
8
8-1/4



167
168
169
170
171
172		 262
263
264
265
266
267		 365
366
367
368
369
370		 441
442
443
444
445
8-1/2
8-3/4
9
9-1/4



173
174
175
176		 268
269
270
271		 371
372
373
374		 446

447
9-1/2
9-3/4
10
10-1/2



177
178


 272
273
274
275		 375
376
377
378		 448

449
450
11
11-1/2
12
12-1/2
13




276
277
278

279		 379
380
381

382		 451
452
453
454
455
13-1/2
14
14-1/2
15





280

281
383

384		 456
457
458
459


Cross Section
I.D. 1/16 3/32 1/8 3/16 1/4
2-3/16
2-1/4
2-5/16
2-3/8
2-7/16
2-1/2
035

036

037		 139
140
141
142
143
144
228

229

230
331

332

333
407

408

409
2-9/16
2-5/8
2-11/16
2-3/4
2-13/16
2-7/8
3
038

039

040
041		 145
146
147
148
149
150
151
231

232

233
234
334

335

336
337
410

411

412
413
3-1/8
3-1/4
3-3/8
3-1/2
3-5/8
042

043
152

153

 235
236
237
238
239		 338
339
340
341
342		 414
415
416
417
418
3-3/4
3-7/8
4
4-1/8
 044

045

 154

155

 240
241
242
243		 343
344
345
346		 419
420
421
422


Cross Section
I.D. 1/16 3/32 1/8 3/16 1/4
15-1/2
16
16-1/2
17





282

283
385

386		 460
461
462
463
17-1/2
18
18-1/2
19





284
387

388		 464
465
466
467
19-1/2
20
21
22
23






389
390
391
392		 468
469
470
471
472
24
25
26




393
394
395





 473
474
475