Aerospace O-

Pressure Seals, Inc.

Aerospace O-Ring Standard AS568A

AS568A (Rev 7/1/74) standardized on one class of O-ring tolerances compared with two
on previous issues. The sizes are grouped by cross section and listed numerically. Actual
sizes for inside diameter are referenced by minimum, mean and maximum dimensions.
Select Series from the table of contents on the left.

000 SERIES: Cross-Section (w) 0.070" � 0.003"

100 SERIES: Cross-Section (w) 0.103" � 0.003"

200 SERIES: Cross-Section (w) 0.139" � 0.004"

300 SERIES: Cross-Section (w) 0.210" � 0.005"

400 SERIES: Cross-Section (w) 0.275" �0.006"

900 SERIES: Sizes for Straight Thread Tube Fittings