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