Author: Mike M.

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400 Series Standard O-Ring Sizes 350-439 (AS 568)

Below is a table of 400 series standard o-ring (0.275″ CS) sizes.  This table actually starts in the 300 series (0.210″ CS) but finishes in the 400-series (0.275″ CS).

If you don’t understand the sizes, check out O-Ring Sizes.  If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.


AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
350 45/8 5 3/16 4.600 ± 0.030 0.210 ± 0.005
351 43/4 51/8 3/16 4.725 ± 0.030 0.210 ± 0.005
352 47/8 51/4 3/16 4.850 ± 0.030 0.210 ± 0.005
353 5 53/8 3/16 4.975 ± 0.037 0.210 ± 0.005
354 51/8 51/2 3/16 5.100 ± 0.037 0.210 ± 0.005
355 51/4 55/8 3/16 5.225 ± 0.037 0.210 ± 0.005
356 53/8 53/4 3/16 5.350 ± 0.037 0.210 ± 0.005
357 51/2 57/8 3/16 5.475 ± 0.037 0.210 ± 0.005
358 55/8 6 3/16 5.600 ± 0.370 0.210 ± 0.005
359 53/4 61/8 3/16 5.725 ± 0.037 0.210 ± 0.005
360 57/8 61/4 3/16 5.850 ± 0.037 0.210 ± 0.005
361 6 63/8 3/16 5.975 ± 0.037 0.210 ± 0.005
362 61/4 65/8 3/16 6.225 ± 0.040 0.210 ± 0.005
363 61/2 67/8 3/16 6.475 ± 0.040 0.210 ± 0.005
364 63/4 71/8 3/16 6.725 ± 0.040 0.210 ± 0.005
365 7 73/8 3/16 6.975 ± 0.040 0.210 ± 0.005
366 71/4 75/8 3/16 7.225 ± 0.045 0.210 ± 0.005
367 71/2 77/8 3/16 7.475 ± 0.045 0.210 ± 0.005
368 73/4 81/8 3/16 7.725 ± 0.045 0.210 ± 0.005
369 8 83/8 3/16 7.975 ± 0.045 0.210 ± 0.005
370 81/4 85/8 3/16 8.225 ± 0.050 0.210 ± 0.005
371 81/2 87/8 3/16 8.475 ± 0.050 0.210 ± 0.005
372 83/4 91/8 3/16 8.725 ± 0.050 0.210 ± 0.005
373 9 93/8 3/16 8.975 ± 0.050 0.210 ± 0.005
374 91/4 95/8 3/16 9.225 ± 0.055 0.210 ± 0.005
375 91/2 97/8 3/16 9.475 ± 0.055 0.210 ± 0.005
376 93/4 101/8 3/16 9.725 ± 0.055 0.210 ± 0.005
377 10 103/8 3/16 9.975 ± 0.055 0.210 ± 0.005
378 101/2 107/8 3/16 10.475 ± 0.060 0.210 ± 0.005
379 11 113/8 3/16 10.975 ± 0.060 0.210 ± 0.005
380 111/2 117/8 3/16 11.475 ± 0.065 0.210 ± 0.005
381 12 123/8 3/16 11.975 ± 0.065 0.210 ± 0.005
382 13 133/8 3/16 12.975 ± 0.065 0.210 ± 0.005
383 14 143/8 3/16 13.975 ± 0.070 0.210 ± 0.005
384 15 153/8 3/16 14.975 ± 0.070 0.210 ± 0.005
385 16 163/8 3/16 15.955 ± 0.075 0.210 ± 0.005
386 17 173/8 3/16 16.955 ± 0.080 0.210 ± 0.005
387 18 183/8 3/16 17.955 ± 0.085 0.210 ± 0.005
388 19 193/8 3/16 18.955 ± 0.090 0.210 ± 0.005
389 20 203/8 3/16 19.955 ± 0.095 0.210 ± 0.005
390 21 213/8 3/16 20.955 ± 0.095 0.210 ± 0.005
391 22 223/8 3/16 21.955 ± 0.100 0.210 ± 0.005
392 23 233/8 3/16 22.940 ± 0.105 0.210 ± 0.005
393 24 243/8 3/16 23.940 ± 0.110 0.210 ± 0.005
394 25 253/8 3/16 24.940 ± 0.115 0.210 ± 0.005
395 26 263/8 3/16 25.940 ± 0.120 0.210 ± 0.005
425 41/2 5 1/4 4.475 ± 0.033 0.275 ± 0.006
426 45/8 51/8 1/4 4.600 ± 0.033 0.275 ± 0.006
427 43/4 51/4 1/4 4.725 ± 0.033 0.275 ± 0.006
428 47/8 53/8 1/4 4.850 ± 0.033 0.275 ± 0.006
429 5 51/2 1/4 4.975 ± 0.037 0.275 ± 0.006
430 51/8 55/8 1/4 5.100 ± 0.037 0.275 ± 0.006
431 51/4 53/4 1/4 5.225 ± 0.037 0.275 ± 0.006
432 53/8 57/8 1/4 5.350 ± 0.037 0.275 ± 0.006
433 51/2 6 1/4 5.475 ± 0.037 0.275 ± 0.006
434 55/8 61/8 1/4 5.600 ± 0.037 0.275 ± 0.006
435 53/4 61/4 1/4 5.725 ± 0.037 0.275 ± 0.006
436 57/8 63/8 1/4 5.850 ± 0.037 0.275 ± 0.006
437 6 61/2 1/4 5.975 ± 0.037 0.275 ± 0.006
438 61/4 63/4 1/4 6.225 ± 0.040 0.275 ± 0.006
439 61/2 7 1/4 6.475 ± 0.040 0.275 ± 0.006

Other Sizes:

000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)

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300 Series Standard O-Ring Sizes 265-349 (AS 568)

Below is a table of 300 series standard o-ring (0.210″ CS) sizes.  This table actually starts in the 200 series (0.139″ CS) but finishes in the 300-series (0.210″ CS).

If you don’t understand the sizes, check out O-Ring Sizes.  If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.


AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
265 73/4 8 1/8 7.734 ± 0.045 0.139 ± 0.004
266 8 81/4 1/8 7.984 ± 0.045 0.139 ± 0.004
267 81/4 81/2 1/8 8.234 ± 0.050 0.139 ± 0.004
268 81/2 83/4 1/8 8.484 ± 0.050 0.139 ± 0.004
269 83/4 9 1/8 8.734 ± 0.050 0.139 ± 0.004
270 9 91/4 1/8 8.984 ± 0.050 0.139 ± 0.004
271 91/4 91/2 1/8 9.234 ± 0.055 0.139 ± 0.004
272 91/2 93/4 1/8 9.484 ± 0.055 0.139 ± 0.004
273 93/4 10 1/8 9.734 ± 0.055 0.139 ± 0.004
274 10 101/4 1/8 9.984 ± 0.055 0.139 ± 0.004
275 101/2 103/4 1/8 10.484 ± 0.055 0.139 ± 0.004
276 11 111/4 1/8 10.984 ± 0.065 0.139 ± 0.004
277 111/2 113/4 1/8 11.484 ± 0.065 0.139 ± 0.004
278 12 121/4 1/8 11.984 ± 0.065 0.139 ± 0.004
279 13 131/4 1/8 12.984 ± 0.065 0.139 ± 0.004
280 14 141/4 1/8 13.984 ± 0.065 0.139 ± 0.004
281 15 151/4 1/8 14.984 ± 0.065 0.139 ± 0.004
282 16 161/4 1/8 15.955 ± 0.075 0.139 ± 0.004
283 17 171/4 1/8 16.955 ± 0.080 0.139 ± 0.004
284 18 181/4 1/8 17.955 ± 0.085 0.139 ± 0.004
309 7/16 13/16 3/16 0.412 ± 0.005 0.210 ± 0.005
310 1/2 7/8 3/16 0.475 ± 0.005 0.210 ± 0.005
311 9/16 15/16 3/16 0.537 ± 0.007 0.210 ± 0.005
312 3/8 1 3/16 0.600 ± 0.009 0.210 ± 0.005
313 11/16 11/16 3/16 0.662 ± 0.009 0.210 ± 0.005
314 3/4 11/8 3/16 0.725 ± 0.010 0.210 ± 0.005
315 13/16 13/16 3/16 0.787 ± 0.010 0.210 ± 0.005
316 7/8 11/4 3/16 0.850 ± 0.050 0.210 ± 0.005
317 15/16 15/16 3/16 0.912 ± 0.010 0.210 ± 0.005
318 1 13/8 3/16 0.975 ± 0.010 0.210 ± 0.005
319 11/16 17/16 3/16 1.037 ± 0.010 0.210 ± 0.005
320 11/8 11/2 3/16 1.100 ± 0.012 0.210 ± 0.005
321 13/16 19/16 3/16 1.162 ± 0.012 0.210 ± 0.005
322 11/4 15/8 3/16 1.225 ± 0.012 0.210 ± 0.005
323 15/16 111/16 3/16 1.287 ± 0.012 0.210 ± 0.005
324 13/8 13/4 3/16 1.350 ± 0.012 0.210 ± 0.005
325 11/2 17/8 3/16 1.475 ± 0.015 0.210 ± 0.005
326 15/8 2 3/16 1.600 ± 0.015 0.210 ± 0.005
327 13/4 21/8 3/16 1.725 ± 0.015 0.210 ± 0.005
328 17/8 21/4 3/16 1.850 ± 0.015 0.210 ± 0.005
329 2 23/8 3/16 1.975 ± 0.018 0.210 ± 0.005
330 21/8 21/2 3/16 2.100 ± 0.018 0.210 ± 0.005
331 21/4 25/8 3/16 2.225 ± 0.018 0.210 ± 0.005
332 23/8 23/4 3/16 2.350 ± 0.018 0.210 ± 0.005
333 21/2 27/8 3/16 2.475 ± 0.020 0.210 ± 0.005
334 25/8 3 3/16 2.600 ± 0.020 0.210 ± 0.005
335 23/4 31/8 3/16 2.725 ± 0.020 0.210 ± 0.005
336 27/8 31/4 3/16 2.850 ± 0.020 0.210 ± 0.005
337 3 33/8 3/16 2.975 ± 0.024 0.210 ± 0.005
338 31/8 31/2 3/16 3.100 ± 0.024 0.210 ± 0.005
339 31/4 35/8 3/16 3.225 ± 0.024 0.210 ± 0.005
340 33/8 33/4 3/16 3.350 ± 0.024 0.210 ± 0.005
341 31/2 37/8 3/16 3.475 ± 0.024 0.210 ± 0.005
342 35/8 4 3/16 3.600 ± 0.028 0.210 ± 0.005
343 33/4 41/8 3/16 3.725 ± 0.028 0.210 ± 0.005
344 37/8 41/4 3/16 3.850 ± 0.028 0.210 ± 0.005
345 4 43/8 3/16 3.975 ± 0.028 0.210 ± 0.005
346 41/8 41/2 3/16 4.100 ± 0.028 0.210 ± 0.005
347 41/4 45/8 3/16 4.225 ± 0.030 0.210 ± 0.005
348 43/8 43/4 3/16 4.350 ± 0.030 0.210 ± 0.005
349 41/2 47/8 3/16 4.475 ± 0.030 0.210 ± 0.005

Other Sizes:

000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)

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200 Series Standard O-Ring Sizes 201-264 (AS 568)

Below is a table of 200 series standard o-ring (0.139″ CS) sizes.  This table goes from 201-264 ID sizes (0.139″ CS).

If you don’t understand the sizes, check out O-Ring Sizes.  If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.


AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
201 3/16 7/16 1/8 0.171 ± 0.005 0.139 ± 0.004
202 1/4 1/2 1/8 0.234 ± 0.005 0.139 ± 0.004
203 5/16 9/16 1/8 0.296 ± 0.005 0.139 ± 0.004
204 3/8 5/8 1/8 0.359 ± 0.005 0.139 ± 0.004
205 7/16 11/16 1/8 0.421 ± 0.005 0.139 ± 0.004
206 1/2 3/4 1/8 0.484 ± 0.005 0.139 ± 0.004
207 9/16 13/16 1/8 0.546 ± 0.007 0.139 ± 0.004
208 5/8 7/8 1/8 0.609 ± 0.009 0.139 ± 0.004
209 11/16 15/16 1/8 0.671 ± 0.009 0.139 ± 0.004
210 3/4 1 1/8 0.734 ± 0.010 0.139 ± 0.004
211 13/16 11/16 1/8 0.796 ± 0.010 0.139 ± 0.004
212 7/8 11/8 1/8 0.859 ± 0.010 0.139 ± 0.004
213 15/16 13/16 1/8 0.921 ± 0.010 0.139 ± 0.004
214 1 11/4 1/8 0.984 ± 0.010 0.139 ± 0.004
215 11/16 15/16 1/8 1.046 ± 0.010 0.139 ± 0.004
216 11/8 13/8 1/8 1.109 ± 0.012 0.139 ± 0.004
217 13/16 17/16 1/8 1.171 ± 0.012 0.139 ± 0.004
218 11/4 11/2 1/8 1.234 ± 0.012 0.139 ± 0.004
219 15/16 19/16 1/8 1.296 ± 0.012 0.139 ± 0.004
220 13/8 15/8 1/8 1.359 ± 0.012 0.139 ± 0.004
221 17/16 111/16 1/8 1.421 ± 0.012 0.139 ± 0.004
222 11/2 13/4 1/8 1.484 ± 0.015 0.139 ± 0.004
223 15/8 17/8 1/8 1.609 ± 0.015 0.139 ± 0.004
224 13/4 2 1/8 1.734 ± 0.015 0.139 ± 0.004
225 17/8 21/8 1/8 1.859 ± 0.018 0.139 ± 0.004
226 2 21/4 1/8 1.984 ± 0.018 0.139 ± 0.004
227 21/8 23/8 1/8 2.109 ± 0.018 0.139 ± 0.004
228 21/4 21/2 1/8 2.234 ± 0.020 0.139 ± 0.004
229 23/8 25/8 1/8 2.359 ± 0.020 0.139 ± 0.004
230 21/2 23/4 1/8 2.484 ± 0.020 0.139 ± 0.004
231 25/8 27/8 1/8 2.609 ± 0.020 0.139 ± 0.004
232 23/4 3 1/8 2.734 ± 0.024 0.139 ± 0.004
233 27/8 31/8 1/8 2.859 ± 0.024 0.139 ± 0.004
234 3 31/4 1/8 2.984 ± 0.024 0.139 ± 0.004
235 31/8 33/8 1/8 3.109 ± 0.024 0.139 ± 0.004
236 31/4 31/2 1/8 3.234 ± 0.024 0.139 ± 0.004
237 33/8 35/8 1/8 3.359 ± 0.024 0.139 ± 0.004
238 31/2 33/4 1/8 3.484 ± 0.024 0.139 ± 0.004
239 35/8 37/8 1/8 3.609 ± 0.028 0.139 ± 0.004
240 33/4 4 1/8 3.734 ± 0.028 0.139 ± 0.004
241 37/8 41/8 1/8 3.859 ± 0.028 0.139 ± 0.004
242 4 41/4 1/8 3.984 ± 0.028 0.139 ± 0.004
243 41/8 43/8 1/8 4.109 ± 0.028 0.139 ± 0.004
244 41/4 41/2 1/8 4.234 ± 0.030 0.139 ± 0.004
245 43/8 45/8 1/8 4.359 ± 0.030 0.139 ± 0.004
246 41/2 43/4 1/8 4.484 ± 0.030 0.139 ± 0.004
247 45/8 47/8 1/8 4.609 ± 0.030 0.139 ± 0.004
248 43/4 5 1/8 4.734 ± 0.030 0.139 ± 0.004
249 47/8 51/8 1/8 4.859 ± 0.030 0.139 ± 0.004
250 5 51/4 1/8 4.984 ± 0.035 0.139 ± 0.004
251 51/8 53/8 1/8 5.109 ± 0.035 0.139 ± 0.004
252 51/4 51/2 1/8 5.234 ± 0.035 0.139 ± 0.004
253 53/8 55/8 1/8 5.359 ± 0.035 0.139 ± 0.004
254 51/2 53/4 1/8 5.484 ± 0.035 0.139 ± 0.004
255 55/8 57/8 1/8 5.609 ± 0.035 0.139 ± 0.004
256 53/4 6 1/8 5.734 ± 0.035 0.139 ± 0.004
257 57/8 61/8 1/8 5.859 ± 0.035 0.139 ± 0.004
258 6 61/4 1/8 5.984 ± 0.035 0.139 ± 0.004
259 61/4 61/2 1/8 6.234 ± 0.040 0.139 ± 0.004
260 61/2 63/4 1/8 6.484 ± 0.040 0.139 ± 0.004
261 63/4 7 1/8 6.734 ± 0.040 0.139 ± 0.004
262 7 71/4 1/8 6.984 ± 0.040 0.139 ± 0.004
263 71/4 71/2 1/8 7.234 ± 0.045 0.139 ± 0.004
264 71/2 73/4 1/8 7.484 ± 0.045 0.139 ± 0.004

Other Sizes:

000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)

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100 Series Standard O-Ring Sizes 115-178 (AS 568)

Below is a table of 100 series standard o-ring (0.103″ CS) sizes.  This table goes from 115-178 ID sizes (0.103″ CS).

If you don’t understand the sizes, check out O-Ring Sizes.  If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.


AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
115 11/16 7/8 3/32 0.674 ± 0.009 0.103 ± 0.003
116 3/4 15/16 3/32 0.737 ± 0.009 0.103 ± 0.003
117 13/16 1 3/32 0.799 ± 0.010 0.103 ± 0.003
118 7/8 11/16 3/32 0.862 ± 0.010 0.103 ± 0.003
119 15/16 11/8 3/32 0.924 ± 0.010 0.103 ± 0.003
120 1 13/16 3/32 0.987 ± 0.010 0.103 ± 0.003
121 11/16 11/4 3/32 1.049 ± 0.010 0.103 ± 0.003
122 11/8 15/16 3/32 1.112 ± 0.010 0.103 ± 0.003
123 13/16 13/8 3/32 1.174 ± 0.012 0.103 ± 0.003
124 11/4 17/16 3/32 1.237 ± 0.012 0.103 ± 0.003
125 15/16 11/2 3/32 1.299 ± 0.012 0.103 ± 0.003
126 13/8 19/16 3/32 1.362 ± 0.012 0.103 ± 0.003
127 17/16 15/8 3/32 1.424 ± 0.012 0.103 ± 0.003
128 11/2 111/16 3/32 1.487 ± 0.012 0.103 ± 0.003
129 19/16 13/4 3/32 1.549 ± 0.012 0.103 ± 0.003
130 15/8 113/16 3/32 1.612 ± 0.015 0.103 ± 0.003
131 111/16 17/8 3/32 1.674 ± 0.015 0.103 ± 0.003
132 13/4 115/16 3/32 1.737 ± 0.015 0.103 ± 0.003
133 113/16 2 3/32 1.799 ± 0.015 0.103 ± 0.003
134 17/8 21/16 3/32 1.862 ± 0.015 0.103 ± 0.003
135 115/16 21/8 3/32 1.925 ± 0.017 0.103 ± 0.003
136 2 23/16 3/32 1.987 ± 0.017 0.103 ± 0.003
137 21/16 21/4 3/32 2.050 ± 0.017 0.103 ± 0.003
138 21/8 25/16 3/32 2.112 ± 0.017 0.103 ± 0.003
139 23/16 23/8 3/32 2.175 ± 0.017 0.103 ± 0.003
140 21/4 27/16 3/32 2.237 ± 0.017 0.103 ± 0.003
141 25/16 21/2 3/32 2.300 ± 0.020 0.103 ± 0.003
142 23/8 29/16 3/32 2.362 ± 0.020 0.103 ± 0.003
143 27/16 25/8 3/32 2.425 ± 0.020 0.103 ± 0.003
144 21/2 211/16 3/32 2.487 ± 0.020 0.103 ± 0.003
145 29/16 23/4 3/32 2.550 ± 0.020 0.103 ± 0.003
146 25/8 213/16 3/32 2.612 ± 0.022 0.103 ± 0.003
147 211/16 27/8 3/32 2.675 ± 0.022 0.103 ± 0.003
148 23/4 215/16 3/32 2.737 ± 0.022 0.103 ± 0.003
149 215/16 3 3/32 2.800 ± 0.022 0.103 ± 0.003
150 27/8 31/16 3/32 2.862 ± 0.022 0.103 ± 0.003
151 3 33/16 3/32 2.987 ± 0.024 0.103 ± 0.003
152 31/4 37/16 3/32 3.237 ± 0.024 0.103 ± 0.003
153 31/2 311/16 3/32 3.487 ± 0.024 0.103 ± 0.003
154 33/4 315/16 3/32 3.737 ± 0.028 0.103 ± 0.003
155 4 43/16 3/32 3.987 ± 0.028 0.103 ± 0.003
156 41/4 47/16 3/32 4.237 ± 0.030 0.103 ± 0.003
157 41/2 411/16 3/32 4.487 ± 0.030 0.103 ± 0.003
158 43/4 415/16 3/32 4.737 ± 0.030 0.103 ± 0.003
159 5 53/16 3/32 4.987 ± 0.035 0.103 ± 0.003
160 51/4 57/16 3/32 5.237 ± 0.035 0.103 ± 0.003
161 51/2 511/16 3/32 5.487 ± 0.035 0.103 ± 0.003
162 53/4 515/16 3/32 5.737 ± 0.035 0.103 ± 0.003
163 6 63/16 3/32 5.987 ± 0.035 0.103 ± 0.003
164 61/4 67/16 3/32 6.237 ± 0.040 0.103 ± 0.003
165 61/2 611/16 3/32 6.487 ± 0.040 0.103 ± 0.003
166 63/4 615/16 3/32 6.737 ± 0.040 0.103 ± 0.003
167 7 73/16 3/32 6.987 ± 0.040 0.103 ± 0.003
168 71/4 77/16 3/32 7.237 ± 0.045 0.103 ± 0.003
169 71/2 711/16 3/32 7.487 ± 0.045 0.103 ± 0.003
170 73/4 715/16 3/32 7.737 ± 0.045 0.103 ± 0.003
171 8 83/16 3/32 7.987 ± 0.045 0.103 ± 0.003
172 81/4 87/16 3/32 8.237 ± 0.050 0.103 ± 0.003
173 81/2 811/16 3/32 8.487 ± 0.050 0.103 ± 0.003
174 83/4 815/16 3/32 8.737 ± 0.050 0.103 ± 0.003
175 9 93/16 3/32 8.987 ± 0.050 0.103 ± 0.003
176 91/4 97/16 3/32 9.237 ± 0.055 0.103 ± 0.003
177 91/2 911/16 3/32 9.487 ± 0.055 0.103 ± 0.003
178 93/4 915/16 3/32 9.737 ± 0.055 0.103 ± 0.003

Other Sizes:

000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)

Posted on

000 Series Standard O-Ring Sizes 001-114 (AS 568)

Below is a table of 000 series standard o-ring (0.070″ CS) sizes.  This table goes beyond the 000 series into the 100-series (0.103″ CS).

If you don’t understand the sizes, check out O-Ring Sizes.  If you don’t know how to use the O-Rings, check out O-Ring Design for Static Sealing.


AS 568A No. Nominal Sizes (inch) Actual Sizes (inch)
ID OD Width ID Width
001 1/32 3/32 1/32 0.029 ± 0.004 0.040 ± 0.003
001 1/2 1/16 1/8 1/32 0.070 ± 0.004 0.040 ± 0.003
002 3/64 9/64 3/64 0.042 ± 0.004 0.050 ± 0.003
003 1/16 3/16 1/16 0.056 ± 0.004 0.060 ± 0.003
004 5/64 13/64 1/16 0.070 ± 0.005 0.070 ± 0.003
005 3/32 7/32 1/16 0.101 ± 0.005 0.070 ± 0.003
006 1/8 1/4 1/16 0.114 ± 0.005 0.070 ± 0.003
007 5/32 9/32 1/16 0.145 ± 0.005 0.070 ± 0.003
008 3/16 5/16 1/16 0.176 ± 0.005 0.070 ± 0.003
009 7/32 11/32 1/16 0.208 ± 0.005 0.070 ± 0.003
010 1/4 3/8 1/16 0.239 ± 0.005 0.070 ± 0.003
011 5/16 7/16 1/16 0.301 ± 0.005 0.070 ± 0.003
012 3/8 1/2 1/16 0.364 ± 0.005 0.070 ± 0.003
013 7/16 9/16 1/16 0.426 ± 0.005 0.070 ± 0.003
014 1/2 5/8 1/16 0.489 ± 0.005 0.070 ± 0.003
015 9/16 11/16 1/16 0.551 ± 0.007 0.070 ± 0.003
016 5/8 3/4 1/16 0.614 ± 0.009 0.070 ± 0.003
017 11/16 13/16 1/16 0.676 ± 0.009 0.070 ± 0.003
018 3/4 7/8 1/16 0.739 ± 0.009 0.070 ± 0.003
019 13/16 15/16 1/16 0.801 ± 0.009 0.070 ± 0.003
020 7/8 1 1/16 0.864 ± 0.009 0.070 ± 0.003
021 15/16 11/16 1/16 0.926 ± 0.009 0.070 ± 0.003
022 1 11/8 1/16 0.989 ± 0.010 0.070 ± 0.003
023 11/16 13/16 1/16 1.051 ± 0.010 0.070 ± 0.003
024 11/8 11/4 1/16 1.114 ± 0.010 0.070 ± 0.003
025 13/16 15/16 1/16 1.176 ± 0.011 0.070 ± 0.003
026 11/4 13/8 1/16 1.239 ± 0.011 0.070 ± 0.003
027 15/16 17/16 1/16 1.301 ± 0.011 0.070 ± 0.003
028 13/8 11/2 1/16 1.364 ± 0.013 0.070 ± 0.003
029 11/2 15/8 1/16 1.489 ± 0.013 0.070 ± 0.003
030 15/8 13/4 1/16 1.614 ± 0.013 0.070 ± 0.003
031 13/4 17/8 1/16 1.739 ± 0.015 0.070 ± 0.003
032 17/8 2 1/16 1.864 ± 0.015 0.070 ± 0.003
033 2 21/8 1/16 1.989 ± 0.018 0.070 ± 0.003
034 21/8 21/4 1/16 2.114 ± 0.018 0.070 ± 0.003
035 21/4 23/8 1/16 2.239 ± 0.018 0.070 ± 0.003
036 23/8 21/2 1/16 2.364 ± 0.018 0.070 ± 0.003
037 21/2 25/8 1/16 2.489 ± 0.018 0.070 ± 0.003
038 25/8 23/4 1/16 2.614 ± 0.020 0.070 ± 0.003
039 23/4 27/8 1/16 2.739 ± 0.020 0.070 ± 0.003
040 27/8 3 1/16 2.864 ± 0.020 0.070 ± 0.003
041 3 31/8 1/16 2.989 ± 0.024 0.070 ± 0.003
042 31/4 33/8 1/16 3.239 ± 0.024 0.070 ± 0.003
043 31/2 35/8 1/16 3.489 ± 0.024 0.070 ± 0.003
044 33/4 37/8 1/16 3.739 ± 0.027 0.070 ± 0.003
045 4 41/8 1/16 3.989 ± 0.027 0.070 ± 0.003
046 41/4 43/8 1/16 4.239 ± 0.030 0.070 ± 0.003
047 41/2 45/8 1/16 4.489 ± 0.030 0.070 ± 0.003
048 43/4 47/8 1/16 4.739 ± 0.030 0.070 ± 0.003
049 5 51/8 1/16 4.989 ± 0.037 0.070 ± 0.003
050 51/4 53/8 1/16 5.239 ± 0.037 0.070 ± 0.003
102 1/16 1/4 3/32 0.049 ± 0.005 0.103 ± 0.003
103 3/32 9/32 3/32 0.081 ± 0.005 0.103 ± 0.003
104 1/8 5/16 3/32 0.112 ± 0.005 0.103 ± 0.003
105 5/32 11/32 3/32 0.143 ± 0.005 0.103 ± 0.003
106 3/16 3/8 3/32 0.174 ± 0.005 0.103 ± 0.003
107 7/32 13/32 3/32 0.206 ± 0.005 0.103 ± 0.003
108 1/4 7/16 3/32 0.237 ± 0.005 0.103 ± 0.003
109 5/16 1/2 3/32 0.299 ± 0.005 0.103 ± 0.003
110 3/8 9/16 3/32 0.362 ± 0.005 0.103 ± 0.003
111 7/16 5/8 3/32 0.424 ± 0.005 0.103 ± 0.003
112 1/2 11/16 3/32 0.487 ± 0.005 0.103 ± 0.003
113 9/16 3/4 3/32 0.549 ± 0.005 0.103 ± 0.003
114 5/8 13/16 3/32 0.612 ± 0.009 0.103 ± 0.003

Other Sizes:

000 Series Standard O-Ring Table (001-114)
100 Series Standard O-Ring Table (115-178)
200 Series Standard O-Ring Table (201-264)
300 Series Standard O-Ring Table (265-349)
400 Series Standard O-Ring Table (350-439)

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Metric Thread – Tap Drill / Clearance Drill

Below is a table for metric tap drill sizes.  It covers both threaded holes (when you are cutting thread) and clearance holes (when you are simply placing a bolt through a hole).


Metric Tap Drill Chart
Tap size Major
Dia (mm)		 Threads
per 		Tap Drill
(mm)		 Tap Drill
(inch)		 Clearance Hole
(mm)		 Clearance Hole
(inch)
M1.6×0.35 1.6 0.35 1.25 #55 1.8 #49
M2x0.4 2.0 0.40 1.60 #52 2.4 #41
M2.5×0.45 2.5 0.45 2.05 #46 2.9 #32
M3x.05 3.0 0.50 2.50 #39 3.4 #29
M3.5×0.6 3.5 0.60 2.90 #32 3.9 #23
M4x0.7 4.0 0.70 3.30 #30 4.5 #16
M5x0.8 5.0 0.80 4.20 #19 5.5 7/32
M6x1 6.0 1.00 5.0 #8 6.6 G
M8x1.25 8.0 1.25 6.8 H 9.0 T
M8x1 8.0 1.00 7.0 J 9.0 T
M10x1.5 10.0 1.50 8.5> R 12.0 31/64
M10x1.25 10.0 1.25 8.8 11/32 12.0 31/64
M12x1.75 12.0 1.75 10.2 13/32 14.0 35/64
M12x1.25 12.0 1.25 10.8 27/64 14.0 35/64
M14x2 14.0 2.00 12.0 15/32 16.0 5/8
M14x1.5 14.0 1.5 12.5 1/2 16.0 5/8
M16x2 16.0 2.00 14.0 35/64 18.0 45/64
M16x1.5 16.0 1.50 14.5 37/64 18.0 45/64
M18x2.5 18.0 2.50 15.5 39/64 20.0 51/64
M18x1.5 18.0 1.50 16.5 21/32 20.0 51/64
M20x2.5 20.0 2.50 17.5 11/16 22.0 7/8
M20x1.5 20.0 1.50 18.5 47/64 22.0 7/8
M22x2.5 22.0 2.50 19.5 49/64 25.0 1
M22x1.5 22.0 1.50 20.5 13/16 25.0 1
M24x3 24.0 3.00 21.0 53/64 27.0 1-5/64
M24x2 24.0 2.00 22.0 7/8 27.0 1-5/64
M27x3 27.0 3.00 24.0 15/16 30.0 1-3/16
M27x2 27.0 2.0 25.0 1 30.0 1-3/16

Standard UNC Tap Drill Sizes
Standard UNF Tap Drill Sizes
Standard NPT Tap Drill Sizes

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Tap Drill Size – UNF

Below is a table of drill and tap sizes for Unified Screw Threads – Fine, UNF.

UNF screws may not always be appropriate.  Depending on the application, you may be better off using UNC fasteners.


INCH SIZES – NATIONAL FINE
TAP SIZE DRILL SIZE
#1-72 #53
#2-64 #50
#3-56 #46
#4-48 #42
#5-44 #37
#6-40 #33
#8-36 #29
#10-32 #21
#12-28 #15
1/4-28 #3
5/16-24 I
3/8-24 Q
7/16-20 W
1/2-20 29/64
9/16-18 33/64
5/8-18 37/64
3/4-16 11/16
7/8-14 13/16
1″-12 15/16
1-1/8-12 1-3/64
1-1/4-12 1-11/64
1-1/2-12 1-27/64
1-3/4-12 1-43/64
2″-12 1-59/64

Metric Tap Drill Sizes
Standard UNC Tap Drill Sizes
Standard NPT Tap Drill Sizes

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Tap Drill Size – UNC

Below is a table of drill and tap sizes for Unified Screw Threads – Course, UNC.

UNC screws may not always be appropriate.  Depending on the application, you may be better off using UNF fasteners.


INCH SIZES – NATIONAL COARSE
TAP SIZE DRILL SIZE
#0-80 3/64″
#1-64 #53
#2-56 #51
#3-48 5/64″
#4-40 #43
#5-40 #39
#6-32 #36
#8-32 #29
#10-24 #25
#12-24 #17
1/4-20 #7
5/16-18 F
3/8-16 5/16
7/16-14 U
1/2-13 27/64
9/16-12 31/64
5/8-11 17/32
3/4-10 21/32
7/8-9 49/64
1″-8 7/8
1-1/8-7 63/64
1-1/4-7 1-7/64
1-1/2-6 1-11/32
1-3/4-5 1-35/64
2″-4-1/2 1-25/32

Metric Tap Drill Sizes
Standard UNF Tap Drill Sizes
Standard NPT Tap Drill Sizes

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Unified Screw Threads – Fine (UNF)

Unified Screw Threads – Fine are the most common type of fine thread found in the US.  Fine threads are useful for imparting a higher tensile load to the bolt with lower assembly torque required.  Unified screw threads consist of a 60-degree thread profile.

The table below shows the major and minor diameters, thread pitch (given in threads per inch, tpi) and finally the diameter  area which is necessary for bolt tensile strength calculations.


Size Major Dia Threads Per Inch Pitch Dia Minor Dia External Minor Dia Internal Minor Dia Area Tensile Stress Area
# inch tpi inch inch inch sq. inch sq. inch
#0 0.06 80 0.0519 0.0451 0.0465 0.00151 0.0018
#1 0.073 72 0.064 0.0565 0.058 0.00237 0.00278
#2 0.086 64 0.0759 0.0674 0.0691 0.00339 0.00394
#3 0.099 56 0.0874 0.0778 0.0797 0.00451 0.00523
#4 0.112 48 0.0985 0.0871 0.0894 0.00566 0.00661
#5 0.125 44 0.1102 0.0979 0.1004 0.00716 0.0083
#6 0.138 40 0.1218 0.1082 0.1109 0.00874 0.01015
#8 0.164 36 0.146 0.1309 0.1339 0.01285 0.01474
#10 0.19 32 0.1697 0.1528 0.1562 0.0175 0.02
#12 0.216 28 0.1928 0.1734 0.1773 0.0226 0.0258
1/4 0.25 28 0.2268 0.2074 0.2113 0.0326 0.0364
5/16 0.3125 24 0.2854 0.2629 0.2674 0.0524 0.058
3/8 0.375 24 0.3479 0.3254 0.3299 0.0809 0.0878
7/16 0.4375 20 0.405 0.378 0.3834 0.109 0.1187
1/2 0.5 20 0.4675 0.4405 0.4459 0.1486 0.1599
9/16 0.5625 18 0.5264 0.4964 0.5024 0.189 0.203
5/8 0.625 18 0.5889 0.5589 0.5649 0.24 0.256
3/4 0.75 16 0.7094 0.6763 0.6823 0.351 0.373
7/8 0.875 14 0.8286 0.79 0.7977 0.48 0.509
1 1 12 0.9459 0.9001 0.9098 0.625 0.663
1-1/8 1.125 12 1.0709 1.0258 1.0348 0.812 0.856
1¼ 1.25 12 1.1959 1.1508 1.1598 1.024 1.073
1-3/8 1.375 12 1.3209 1.2758 1.2848 1.26 1.315
1½ 1.5 12 1.4459 1.4008 1.4098 1.521 1.581

If you need a screw that is less sensitive to over-torquing, consider using a Unified Screw Thread – Course (UNC) instead of the Unified Screw Thread – Fine (UNF).

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Unified Screw Threads – Course (UNC)

Unified Screw Threads – Course are the most common type of thread found in the US.  Unified screw threads consist of a 60-degree thread profile.

The table below shows the major and minor diameters, thread pitch (given in threads per inch, tpi) and finally the diameter  area which is necessary for bolt tensile strength calculations.


Size Major Dia Threads Per Inch Pitch Dia Minor Dia External Minor Dia Internal Minor Dia Area Tensile Stress Area
# inch tpi inch inch inch sq. inch sq. inch
#1 0.073 64 0.0629 0.0544 0.0561 0.00218 0.00263
#2 0.086 56 0.0744 0.0648 0.0667 0.0031 0.0037
#3 0.099 48 0.0855 0.0741 0.0764 0.00406 0.00487
#4 0.112 40 0.0958 0.0822 0.0849 0.00496 0.00604
#5 0.125 40 0.1088 0.0952 0.0979 0.00672 0.00796
#6 0.138 32 0.1177 0.1008 0.1042 0.00745 0.00909
#8 0.164 32 0.1437 0.1268 0.1302 0.01196 0.014
#10 0.19 24 0.1629 0.1404 0.1449 0.0145 0.0175
#12 0.216 24 0.1889 0.1664 0.1709 0.0206 0.0242
¼ 0.25 20 0.2175 0.1905 0.1959 0.0269 0.0318
5/16 0.3125 18 0.2764 0.2464 0.2524 0.0454 0.0524
3/8 0.375 16 0.3344 0.3005 0.3073 0.0678 0.0775
7/16 0.4375 14 0.3911 0.3525 0.3602 0.0933 0.1063
½ 0.5 13 0.45 0.4084 0.4167 0.1257 0.1419
9/16 0.5625 12 0.5084 0.4633 0.4723 0.162 0.182
5/8 0.625 11 0.566 0.5168 0.5266 0.202 0.226
¾ 0.75 10 0.685 0.6309 0.6417 0.302 0.334
7/8 0.875 9 0.8028 0.7427 0.7547 0.419 0.462
1 1 8 0.9188 0.8512 0.8647 0.551 0.606
1-1/8 1.125 7 1.0322 0.9549 0.9704 0.693 0.763
1¼ 1.25 7 1.1572 1.0799 1.0954 0.89 0.969
1-3/8 1.375 6 1.2667 1.1766 1.1946 1.054 1.155
1½ 1.5 6 1.3917 1.3016 1.3196 1.294 1.405
1¾ 1.75 5 1.6201 1.5119 1.5335 1.74 1.9
2 2 4.5 1.8557 1.7353 1.7594 2.3 2.5
2¼ 2.25 4.5 2.1057 1.9853 2.0094 3.02 3.25
2½ 2.5 4 2.3376 2.2023 2.2294 3.72 4
2¾ 2.75 4 2.5876 2.4523 2.4794 4.62 4.93
3 3 4 2.8376 2.7023 2.7294 5.62 5.97
3¼ 3.25 4 3.0876 2.9523 2.9794 6.72 7.1
3½ 3.5 4 3.3376 3.2023 3.2294 7.92 8.33
3¾ 3.75 4 3.5876 3.4523 3.4794 9.21 9.66
4 4 4 3.8376 3.7023 3.7294 10.61 11.08

If you need to apply more tensile load with less torque, consider using a Unified Screw Thread – Fine (UNF) instead of the Unified Screw Thread – Course (UNC).