Explore our AS-568 & Extended Standard Size O-Rings
Unit of Measure

C/S (inches)

N/A 0.210

C/S Tolerance (±)

N/A 0.005

I.D. (inches)

N/A 19.955

I.D. Tolerance (±)

N/A 0.095

O.D. (REF) (inches)

N/A 20.375

Nominal C/S (inches)

N/A 3/16

Nominal I.D. (inches)

N/A 20

Nominal O.D. (inches)

N/A 20 3/8

Metric C/S (mm)

N/A 5.3

Metric I.D. (mm)

N/A 506.9

Metric O.D. (mm)

N/A 517.5
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