ASME B16.20 is the standard for spiral wound gaskets for asme b16.5 flanges (ASME B16.20 · raised face · NPS ½ – 24 · class 150 – 2500). HBS Solutions supplies ASME B16.20 gaskets from stock, with EN 10204 3.1 / 3.2 certificates.

Which sizes does ASME B16.20 cover?

The HBS datasheet lists ASME B16.20 from 1/2" to 24". The full dimension tables are on this page and in the free PDF datasheet.

How do I order ASME B16.20 gaskets?

Configure the part online or send your parts list through the quote form; HBS Solutions replies with a quotation within 24 hours. Stock items ship from 500.000+ pieces in stock in Almere, the Netherlands.

Gaskets

ASME B16.20 – Spiral wound gaskets for ASME B16.5 flanges

ASME B16.20 · raised face · NPS ½ – 24 · class 150 – 2500. Dimensions from the HBS technical datasheet – in stock, with EN 10204 3.1 / 3.2 certificates.

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Dimensions

ASME B16.20 dimension tables.

Sealing element, in mm

Sealing element, in mm
NPS	d3 – sealing element OD		d2 – sealing element ID per class
NPS	cl. 150–600	cl. 900–2500	150	300	400	600	900	1500	2500
1/2"	31.8	31.8	19.1	19.1	19.1	19.1	–	19.1	19.1
3/4"	39.6	39.6	25.4	25.4	25.4	25.4	–	25.4	25.4
1"	47.8	47.8	31.8	31.8	31.8	31.8	–	31.8	31.8
1-1/4"	60.5	60.5	47.8	47.8	47.8	47.8	–	39.6	39.6
1-1/2"	69.9	69.9	54.1	54.1	54.1	54.1	–	47.8	47.8
2"	85.9	85.9	69.9	69.9	69.9	69.9	–	58.7	58.7
2-1/2"	98.6	98.6	82.6	82.6	82.6	82.6	–	69.9	69.9
3"	120.7	120.7	101.6	101.6	101.6	101.6	95.3	92.2	92.2
4"	149.4	149.4	127	127	120.7	120.7	120.7	117.6	117.6
5"	177.8	177.8	155.7	155.7	147.6	147.6	147.6	143	143
6"	209.6	209.6	182.6	182.6	174.8	174.8	174.8	171.5	171.5
8"	263.7	257.3	233.4	233.4	225.6	225.6	222.3	215.9	215.9
10"	317.5	311.2	287.3	287.3	274.6	274.6	276.4	266.7	270
12"	374.7	368.3	339.9	339.9	327.2	327.2	323.9	323.9	317.5
14"	406.4	400.1	371.6	371.6	362	362	355.6	362	–
16"	463.6	457.2	422.4	422.4	412.8	412.8	412.8	406.4	–
18"	527.1	520.7	474.7	474.7	469.9	469.9	463.6	463.6	–
20"	577.9	571.5	525.5	525.5	520.7	520.7	520.7	514.4	–
24"	685.8	679.5	628.7	628.7	628.7	628.7	628.7	616	–

Outer (centering) ring, outside diameter d4, in mm

Outer (centering) ring, outside diameter d4, in mm
NPS	d4 – outer (centering) ring OD per class
NPS	150	300	400	600	900	1500	2500
1/2"	47.8	54.1	–	54.1	–	63.5	69.9
3/4"	57.2	66.8	–	66.8	–	69.9	76.2
1"	66.8	73.2	–	73.2	–	79.5	85.9
1-1/4"	76.2	82.6	–	82.6	–	88.9	104.9
1-1/2"	85.9	95.3	–	95.3	–	98.6	117.6
2"	104.9	111.3	–	111.3	–	143	146.1
2-1/2"	124	130.3	–	130.3	–	165.1	168.4
3"	136.7	149.4	–	149.4	168.4	174.8	196.9
4"	174.8	181.1	177.8	193.8	206.5	209.6	235
5"	196.9	215.9	212.9	241.3	247.7	254	279.4
6"	222.3	251	247.7	266.7	289.1	282.7	317.5
8"	279.4	308.1	304.8	320.8	358.9	352.6	387.4
10"	339.9	362	358.9	400.1	435.1	435.1	476.3
12"	409.7	422.4	419.1	457.2	498.6	520.7	549.4
14"	450.9	485.9	482.6	492.3	520.7	577.9	–
16"	514.4	539.8	536.7	565.2	574.8	641.4	–
18"	549.4	596.9	593.9	612.9	638.3	704.9	–
20"	606.6	654.1	647.7	682.8	698.5	755.7	–
24"	717.6	774.7	768.4	790.7	838.2	901.7	–

Ring dimensions, in mm

Ring dimensions, in mm
Ring	P	A	B	H	C	R1
R 11	34.14	6.35	11.2	9.7	4.32	1.5
R 12	39.7	7.95	14.2	12.7	5.23	1.5
R 13	42.88	7.95	14.2	12.7	5.23	1.5
R 14	44.45	7.95	14.2	12.7	5.23	1.5
R 15	47.63	7.95	14.2	12.7	5.23	1.5
R 16	50.8	7.95	14.2	12.7	5.23	1.5
R 17	57.15	7.95	14.2	12.7	5.23	1.5
R 18	60.33	7.95	14.2	12.7	5.23	1.5
R 19	65.1	7.95	14.2	12.7	5.23	1.5
R 20	68.28	7.95	14.2	12.7	5.23	1.5
R 21	72.24	11.13	17.5	16	7.75	1.5
R 22	82.55	7.95	14.2	12.7	5.23	1.5
R 23	82.55	11.13	17.5	16	7.75	1.5
R 24	95.25	11.13	17.5	16	7.75	1.5
R 25	101.6	7.95	14.2	12.7	5.23	1.5
R 26	101.6	11.13	17.5	16	7.75	1.5
R 27	107.95	11.13	17.5	16	7.75	1.5
R 28	111.13	12.7	19.1	17.5	8.66	1.5
R 29	114.3	7.95	14.2	12.7	5.23	1.5
R 30	117.48	11.13	17.5	16	7.75	1.5
R 31	123.83	11.13	17.5	16	7.75	1.5
R 32	127	12.7	19.1	17.5	8.66	1.5
R 33	131.78	7.95	14.2	12.7	5.23	1.5

Dimension table 4
Ring	P	A	B	H	C	R1
R 34	131.78	11.13	17.5	16	7.75	1.5
R 35	136.53	11.13	17.5	16	7.75	1.5
R 36	149.23	7.95	14.2	12.7	5.23	1.5
R 37	149.23	11.13	17.5	16	7.75	1.5
R 38	157.18	15.88	22.4	20.6	10.49	1.5
R 39	161.93	11.13	17.5	16	7.75	1.5
R 40	171.45	7.95	14.2	12.7	5.23	1.5
R 41	180.98	11.13	17.5	16	7.75	1.5
R 42	190.5	19.05	25.4	23.9	12.32	1.5
R 43	193.68	7.95	14.2	12.7	5.23	1.5
R 44	193.68	11.13	17.5	16	7.75	1.5
R 45	211.15	11.13	17.5	16	7.75	1.5
R 46	211.15	12.7	19.1	17.5	8.66	1.5
R 47	228.6	19.05	25.4	23.9	12.32	1.5
R 48	247.65	7.95	14.2	12.7	5.23	1.5
R 49	269.88	11.13	17.5	16	7.75	1.5
R 50	269.88	15.88	22.4	20.6	10.49	1.5
R 51	279.4	22.23	28.7	26.9	14.81	1.5
R 52	304.8	7.95	14.2	12.7	5.23	1.5
R 53	323.85	11.13	17.5	16	7.75	1.5
R 54	323.85	15.88	22.4	20.6	10.49	1.5
R 55	342.9	28.58	36.6	35.1	19.81	2.3
R 56	381	7.95	14.2	12.7	5.23	1.5

Dimension table 5
Ring	P	A	B	H	C	R1
R 57	381	11.13	17.5	16	7.75	1.5
R 58	381	22.23	28.7	26.9	14.81	1.5
R 59	396.88	7.95	14.2	12.7	5.23	1.5
R 60	406.4	31.75	39.6	38.1	22.33	2.3
R 61	419.1	11.13	17.5	16	7.75	1.5
R 62	419.1	15.88	22.4	20.6	10.49	1.5
R 63	419.1	25.4	33.3	31.8	17.3	2.3
R 64	454.03	7.95	14.2	12.7	5.23	1.5
R 65	469.9	11.13	17.5	16	7.75	1.5
R 66	469.9	15.88	22.4	20.6	10.49	1.5
R 67	469.9	28.58	36.6	35.1	19.81	2.3
R 68	517.53	7.95	14.2	12.7	5.23	1.5
R 69	533.4	11.13	17.5	16	7.75	1.5
R 70	533.4	19.05	25.4	23.9	12.32	1.5
R 71	533.4	28.58	36.6	35.1	19.81	2.3
R 72	558.8	7.95	14.2	12.7	5.23	1.5
R 73	584.2	12.7	19.1	17.5	8.66	1.5
R 74	584.2	19.05	25.4	23.9	12.32	1.5
R 75	584.2	31.75	39.6	38.1	22.33	2.3
R 76	673.1	7.95	14.2	12.7	5.23	1.5
R 77	692.15	15.88	22.4	20.6	10.49	1.5
R 78	692.15	25.4	33.3	31.8	17.3	2.3
R 79	692.15	34.93	44.5	41.4	24.82	2.3

d2: Sealing element, inside diameter
d3: Sealing element, outside diameter
P: Pitch diameter of ring
A: Width of ring
B: Height of oval ring
H: Height of octagonal ring
C: Width of flat on octagonal ring

Classes. There are no class 400 flanges NPS ½–3 (use class 600) and no class 900 flanges NPS ½–2½ (use class 1500); class 2500 covers NPS ½–12. Cells in those ranges are shown as –.

Thickness. Sealing element 4.45 mm (0.175"). Inner ring inside diameters are not listed on this sheet.

– : no flange of this size and class in ASME B16.5.

Gaskets

Related standards.

ASME B16.21

All standards →

Questions

ASME B16.20 – frequently asked questions.

What is ASME B16.20?: ASME B16.20 is the standard for spiral wound gaskets for asme b16.5 flanges (ASME B16.20 · raised face · NPS ½ – 24 · class 150 – 2500). HBS Solutions supplies ASME B16.20 gaskets from stock, with EN 10204 3.1 / 3.2 certificates.
Which sizes does ASME B16.20 cover?: The HBS datasheet lists ASME B16.20 from 1/2" to 24". The full dimension tables are on this page and in the free PDF datasheet.
How do I order ASME B16.20 gaskets?: Configure the part online or send your parts list through the quote form; HBS Solutions replies with a quotation within 24 hours. Stock items ship from 500.000+ pieces in stock in Almere, the Netherlands.

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