engineering fundamentals AS 568A Standard O-Ring Sizes
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AS 568A Std Sizes
  001 to 114
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  265 to 349
  350 to 439
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AS 568A No. Covered Range
("W" is the O-ring cross-section diameter, also called the "width")
001 to 114 ID from 0.029" to 0.070" for W=0.040"; 0.042" for W=0.050"; 0.056" for W=0.060"; from 0.070" to 5.239" for W=0.070"; from 0.049" to 0.612" for W=0.103"
115 to 178 ID from 0.674" to 9.737" for W=0.103"
201 to 264 ID from 0.171" to 7.484" for W=0.139"
265 to 349 ID from 7.734" to 17.955" for W=0.139"; from 0.412" to 4.475" for W=0.210"
350 to 439 ID from 4.600" to 25.940" for W=0.210"; from 4.475" to 6.475" for W=0.275"
 
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
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