engineering fundamentals AS 568A Standard O-Ring Sizes
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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
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
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