Dimensions of Double Metal-Jacketed Gaskets ASME B16.20 to be used with Raised Face flanges ASME B16.5

Class 150# to 400#

NPS	d1	d2
		150	300	400
1/2	23.8	44.5	50.8	50.8
3/4	31.8	54	63.5	63.5
1	36.5	63.5	69.9	69.9
1¼	46	73	79.4	79.4
1½	52.4	82.6	92.1	92.1
2	73.2	101.6	108	108
2½	85.9	120.6	127	127
3	107.8	133.4	146.1	146.1
4	131.8	171.5	177.8	174.7
5	152.4	193.8	212.8	209.5
6	190.5	219.1	247.7	244.5
8	238.3	276.3	304.8	301.7
10	285.8	336.6	358.8	355.6
12	342.9	406.4	419.1	415.9
14	374.7	447.7	482.6	479.5
16	425.5	511.2	536.6	533.4
18	489	546.1	593.7	590.6
20	533.4	603.3	650.9	644.5
24	641.4	714.4	771.6	765.3
NPS	d1	150	300	400
		d2

Class 600# to 2500#

NPS	d1	d2
		600	900	1500	2500
1/2	23.8	50.8	60.4	60.4	66.8
3/4	31.8	63.5	66.7	66.7	73.1
1	36.5	69.9	76.2	76.2	82.5
1¼	46	79.4	85.8	85.8	101.6
1½	52.4	92.1	95.3	95.3	114.3
2	73.2	108	139.7	139.7	143
2½	85.9	127	161.9	161.9	165.1
3	107.8	146.1	165.1	171.5	193.8
4	131.8	190.5	203.2	206.5	231.9
5	152.4	238.2	244.6	250.9	276.3
6	190.5	263.6	285.8	279.4	314.5
8	238.3	317.5	355.6	349.3	384.3
10	285.8	396.9	431.8	431.8	473.2
12	342.9	454.1	495.3	517.6	546.1
14	374.7	489	517.6	574.7	…
16	425.5	562	571.5	638.2	…
18	489	609.6	635	701.8	…
20	533.4	679.5	695.5	752.5	…
24	641.4	787.4	835.1	898.6	…
NPS	d1	600	900	1500	2500
		d2

General notes:

1. Dimensions are in millimeters unless otherwise indicated.
2. d1 = Inside diameter.
3. d2 = Outside diameter.
4. Dimensional dimensional tolerances diameter up to NPS 24 = + 1.58 / – 0 mm for both diameters.
5. Dimensional dimensional tolerances thickness (t) up to NPS 24 = + 0.80 / – 0 mm.
6. Thickness (t) specified by customer.