PAI AN U-Cups are made to the dimensions of Military Drawing AN 6226.
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Unit of Measure
Items
AN 6226 Style U-Cup

1/8 inch Nominal I.D. and 3/8 inch Nominal O.D. AN U-Cup
AN 6226 Style U-Cup

3/16 inch Nominal I.D. and 7/16 inch Nominal O.D. AN U-Cup
AN 6226 Style U-Cup

1/4 inch Nominal I.D. and 1/2 inch Nominal O.D. AN U-Cup
AN 6226 Style U-Cup

5/16 inch Nominal I.D. and 9/16 inch Nominal O.D. AN U-Cup
AN 6226 Style U-Cup

3/8 inch Nominal I.D. and 5/8 inch Nominal O.D. AN U-Cup
Nominal I.D. (inches) N/A 1/8 N/A 3/16 N/A 1/4 N/A 5/16 N/A 3/8
Nominal O.D. (inches) N/A 3/8 N/A 7/16 N/A 1/2 N/A 9/16 N/A 5/8
Nominal C/S (inches) N/A 1/8
C/S (inches) N/A 0.125
I.D. (inches) N/A 0.125 N/A 0.187 N/A 0.250 N/A 0.312 N/A 0.375
O.D. (Inches) N/A .375 N/A .437 N/A .500 N/A .562 N/A .625
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