Copper Tubing Specifications


Medical Gas Tubing must meet ASTM B-819 specifications.  It is cleaned for oxygen service and delivered capped.  It must bear the following marking, MED, OXY, MEDOXY or OXYMED.

Tubing is manufactured in two different grades, L & K.  Type K tubing has a heavier wall thickness. Thus it can withstand higher pressures, is heavier, and has less cross sectional size.  It is used for pressures over 200 psi (Nitrogen systems). 

Both type K & L tubing have the same OD (outside dimension), so all wrought copper fittings will work with both sizes of tubing.  Here is a handy chart of specifications.

TYPE "L" MED/OXY

Nominal Size

ID (in.) OD (in.) sq. in. lbs. / ft
1/2" .545 .625 .233 .285
3/4" .785 .875 .484 .455
1" 1.025 1.125 .825 .655
1-1/4" 1.265 1.375 1.26 .884
1-1/2" 1.505 1.625 1.78 1.14
2" 1.985 2.125 3.09 1.75
2-1/2" 2.465 2.625 4.77 2.48
3" 2.945 3.125 6.81 3.33

TYPE "K" MED/OXY

Nominal Size

ID (in.) OD (in.) sq. in. lbs. / ft
1/2" .527 .625 .218 .344
3/4" .745 .875 .436 .641
1" .995 1.125 .778 .839
1-1/4" 1.245 1.375 1.222 1.04
1-1/2" 1.481 1.625 1.72 1.36
2" 1.959 2.125 3.01 2.06
2-1/2" 2.435 2.625 4.66 2.93
3" 2.907 3.125 6.64 4.00

Call AMGI (866) 288-3783 for more information