Aerospace O-Ring Standard AS568A Sizing Chart

The sizes are grouped by cross section and listed numerically.
Actual sizes for inside diameter are referenced
by minimum, mean and maximum dimensions.

000 SERIES Cross-Section (width) 0.070" +or- 0.003"

Inside Diameter in Inches

No.

Min.

Mean

Max.

No.

Min.

Mean

Max.

-001 0.025 0.029 0.033 -026 1.228 1.239 1.250

-002 0.038 0.042 0.046 -027 1.290 1.301 1.312

-003 0.052 0.056 0.060 -028 1.351 1.364 1.377

-004 0.065 0.070 0.075 -029 1.476 1.489 1.502

-005 0.096 0.101 0.106 -030 1.601 1.614 1.627

-006 0.109 0.114 0.119 -031 1.724 1.739 1.754

-007 0.140 0.145 0.150 -032 1.849 1.864 1.879

-008 0.171 0.176 0.181 -033 1.971 1.989 2.007

-009 0.203 0.208 0.213 -034 2.096 2.114 2.132

-010 0.234 0.239 0.244 -035 2.221 2.239 2.257

-011 0.296 0.301 0.306 -036 2.346 2.364 2.382

-012 0.359 0.364 0.369 -037 2.471 2.489 2.507

-013 0.421 0.426 0.431 -038 2.594 2.614 2.634

-014 0.484 0.489 0.494 -039 2.719 2.739 2.759

-015 0.544 0.551 0.558 -040 2.844 2.864 2.884

-016 0.605 0.614 0.623 -041 2.965 2.989 3.013

-017 0.667 0.676 0.685 -042 3.215 3.239 3.263

-018 0.730 0.739 0.748 -043 3.465 3.489 3.513

-019 0.792 0.801 0.810 -044 3.712 3.739 3.766

-020 0.855 0.864 0.873 -045 3.962 3.989 4.016

-021 0.917 0.926 0.935 -046 4.209 4.239 4.269

-022 0.979 0.989 0.999 -047 4.459 4.489 4.519

-023 1.041 1.051 1.061 -048 4.709 4.739 4.769

-024 1.104 1.114 1.124 -049 4.952 4.989 5.026

-025 1.165 1.176 1.187 -050 5.202 5.239 5.276

Aerospace O-Ring Standard AS568A continued