EU Pipe Sizes: EN 10220 & EN ISO 1127

Quick Reference

European pipe dimension standards: EN 10220 (carbon/alloy steel), EN ISO 1127 (stainless steel). Pipes sized by OD x WT in mm. EN 10220 series: 1, 2, 3, 4. EN 1127 series: H1-H4 (heavy), L1-L4 (light). US equivalents: ASME B36.10/B36.19.

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EN 10220 Pipe Size Specification

The BS EN 10220 specification covers the dimensions and tolerances of carbon and low-alloy steel pipes manufactured (or installed) in Europe.

EN 10220:2002 is a European Standard that specifies the dimensions and tolerances of seamless and welded steel tubes for general purposes. It defines outside diameters, wall thicknesses, and exact lengths of steel tubes, along with the associated tolerances for each.

EN 10220 standardizes dimensional specifications for steel tubes across Europe, ensuring interoperability and consistent quality across applications.

EN 10220 Summary

Aspect	Description
Scope	Covers seamless and welded (except submerged arc-welded) steel tubes for pressure purposes, full peripheral magnetic testing for the detection of longitudinal imperfections, and ultrasonic testing for the detection of laminar imperfections.
OD and Wall Thickness	Provides detailed charts specifying the permissible variations in outside diameter and wall thickness for steel tubes, ensuring suitability for intended pressure and structural requirements.
Length Tolerances	Specifies tolerances for the lengths of tubes, including standard lengths and permissible variations, ensuring correct fit within designed piping or structural systems without excessive modifications.
Tolerances on Shape	Includes straightness and roundness tolerances, ensuring that tubes can be fitted and welded with precision in various configurations and applications.

EN 10220 defines the dimensional specifications and tolerances that ensure quality and compatibility of steel tubes used in European construction, engineering, and manufacturing. This standardization simplifies the design, specification, and procurement of steel tubes and supports the safety, reliability, and performance of piping systems and structural projects.

OD = Pipe outside diameter in mm WT = Pipe wall thickness in mm

OD (mm)	0.5	0.6	0.8	1	1.2	1.4	1.6	1.8	2	2.3	2.6	2.9	3.2	3.6	4	4.5	5	5.4	5.6	6.3
10.2	0.12	0.142	0.185	0.227	0.266	0.304	0.339	0.373	0.404	0.448	0.487
13.5	0.16	0.191	0.251	0.308	0.364	0.418	0.47	0.519	0.567	0.636	0.699	0.758	0.813	0.879
17.2	0.206	0.246	0.324	0.4	0.474	0.546	0.616	0.684	0.75	0.845	0.936	1.02	1.1	1.21	1.3	1.41
21.3	0.256	0.306	0.404	0.501	0.595	0.687	0.777	0.866	0.952	1.08	1.2	1.32	1.43	1.57	1.71	1.86	2.01	2.12
26.9	0.326	0.389	0.515	0.639	0.761	0.88	0.998	1.11	1.23	1.4	1.56	1.72	1.87	2.07	2.26	2.49	2.7	2.86	2.94	3.2
33.7	0.409	0.49	0.649	0.806	0.962	1.12	1.27	1.42	1.56	1.78	1.99	2.2	2.41	2.67	2.93	3.24	3.54	3.77	3.88	4.26
42.4	0.517	0.619	0.821	1.02	1.22	1.42	1.61	1.8	1.99	2.27	2.55	2.82	3.09	3.44	3.79	4.21	4.61	4.93	5.08	5.61
48.3		0.706	0.937	1.17	1.39	1.62	1.84	2.06	2.28	2.61	2.93	3.25	3.56	3.97	4.37	4.86	5.34	5.71	5.9	6.53
60.3		0.883	1.17	1.46	1.75	2.03	2.32	2.6	2.88	3.29	3.7	4.11	4.51	5.03	5.55	6.19	6.82	7.31	7.55	8.39
76.1			1.49	1.85	2.22	2.58	2.94	3.3	3.65	4.19	4.71	5.24	5.75	6.44	7.11	7.95	8.77	9.42	9.74	10.8
88.9			1.74	2.17	2.6	3.02	3.44	3.87	4.29	4.91	5.53	6.15	6.76	7.57	8.38	9.37	10.3	11.1	11.5	12.8
114.3					3.35	3.9	4.45	4.99	5.54	6.35	7.16	7.97	8.77	9.83	10.9	12.2	13.5	14.5	15	16.8
139.7							5.45	6.12	6.79	7.79	8.79	9.78	10.8	12.1	13.4	15	16.6	17.9	18.5	20.7
168.3							6.58	7.39	8.2	9.42	10.6	11.8	13	14.6	16.2	18.2	20.1	21.7	22.5	25.2
219.1								9.65	10.7	12.3	13.9	15.5	17	19.1	21.2	23.8	26.4	28.5	29.5	33.1
273									13.4	15.4	17.3	19.3	21.3	23.9	26.5	29.8	33	35.6	36.9	41.4
323.9											20.6	23	25.3	28.4	31.6	35.4	39.3	42.4	44	49.3
355.6											22.6	25.2	27.8	31.3	34.7	39	43.2	46.6	48.3	54.3
406.4											25.9	28.9	31.8	35.8	39.7	44.6	49.5	53.4	55.4	62.2
457													35.8	40.3	44.7	50.2	56.7	60.1	62.3	70
508													39.8	44.8	49.7	55.9	62	66.9	69.4	77.9
610													47.9	53.8	59.8	67.2	74.6	80.5	83.5	93.8
711															69.7	78.4	87.1	94	97.4	109
813															79.8	89.7	99.6	108	112	125
914															89.8	101	112	121	125	141
1016															99.8	112	125	135	140	157
1067																	131	141	147	165
1118																	137	148	154	173
1219																	150	162	168	188
1422																			196	220
1626																				252

EN 10220 Specification continued, for wall thicknesses above 6.1 mm:

OD	7,1	8	8,8	10	11	12,5	14,2	16	17,5	20	22,2	25	28	30	32	36	40	45	50	55	60	65
26,9	3,47	3,73
33,7	4,66	5,07	5,40
42,4	6,18	6,79	7,29	7,99
48,3	7,21	7,95	8,57	9,45	10,1	11,0
60,3	9,32	10,3	11,2	12,4	13,4	14,7	16,1	17,5
76,1	12,1	13,4	14,6	16,3	17,7	19,6	21,7	23,7	25,3	27,7
88,9	14,3	16,0	17,4	19,5	21,1	23,6	26,2	28,8	30,8	34,0	36,5	39,4
114,3	18,8	21,0	22,9	25,7	28,0	31,4	35,1	38,8	41,8	46,5	50,4	55,1	59,6	62,4	64,9
139,7	23,2	26,0	28,4	32,0	34,9	39,2	43,9	48,8	52,7	59,0	64,3	70,7	77,1	81,2	85,0	92,1	98,4
168,3	28,2	31,6	34,6	39,0	42,7	48,0	54,0	60,1	65,1	73,1	80,0	88,3	96,9	102	108	117	127	137	146
219,1	37,1	41,6	45,6	51,6	56,5	63,7	71,8	80,1	87,0	98,2	108	120	132	140	148	163	177	193	209	223	235	247
273	46,6	52,3	57,3	64,9	71,1	80,3	90,6	101	110	125	137	153	169	180	190	210	230	253	275	296	315	333
323,9	55,5	62,3	68,4	77,4	84,9	96,0	108	121	132	150	165	184	204	217	230	256	280	310	338	365	390	415
355,6	61,0	68,6	75,3	85,2	93,5	106	120	134	146	166	183	204	226	241	255	284	311	345	377	408	437	466
406,4	69,9	78,6	86,3	97,8	107	121	137	154	168	191	210	235	261	278	295	329	361	401	439	477	513	547
457	78,8	88,6	97,3	110	121	137	155	174	190	216	238	266	296	316	335	374	411	457	502	545	587	628
508	87,7	98,6	108	123	135	153	173	194	212	241	266	298	331	354	376	419	462	514	565	614	663	710
610	106	119	130	148	162	184	209	234	256	291	322	361	402	429	456	510	562	627	691	753	814	874
711	123	139	152	173	190	215	244	274	299	341	377	423	472	504	536	599	662	739	815	890	963	1036
813	141	159	175	198	218	247	280	314	343	391	433	486	542	579	616	690	763	852	941	1028	1114	1199
914	159	179	196	223	245	278	315	354	387	441	488	548	612	654	696	780	862	964	1065	1165	1264	1361
1016	177	199	219	248	273	309	351	395	431	491	544	611	682	729	777	870	963	1078	1191	1303	1415	1524
1067	186	209	230	261	286	325	369	415	453	516	572	642	717	767	817	915	1013	1134	1254	1373	1490	1606
1118	195	219	241	273	300	341	387	435	475	542	600	674	753	805	857	961	1063	1191	1317	1442	1556	1688
1219	212	239	263	298	328	372	422	475	519	591	655	736	822	880	937	1050	1163	1303	1441	1579	1715	1850

EN ISO 1127 Pipe Size Specification

The EN ISO 1127 specification covers the dimensions and tolerances of European stainless steel and nickel alloy pipes.

EN ISO 1127 is an international standard adopted in Europe that defines the dimensions, tolerances, and conventional masses per unit length of stainless steel tubes. It ensures compatibility and interchangeability of tubes across applications, covering sizes from small-diameter instrumentation tubing to larger-diameter industrial pipes.

Size Specifications Overview

Parameter	Description
Outside Diameter (OD)	Stainless steel pipes and tubes in Europe are often specified by their outside diameter. The range can vary from very small diameters for instrumentation tubes (e.g., a few millimeters) to large diameters for industrial applications (up to several hundred millimeters).
Wall Thickness	The standards specify a range of wall thicknesses, denoted by schedule numbers or directly in millimeters. The choice of wall thickness affects the pipe’s pressure rating and mechanical strength.
Pipe Length	Standard lengths are usually provided, but custom lengths can be ordered to meet specific project requirements.
Tolerances	The standards specify tolerances for dimensions (including outside diameter and wall thickness) to ensure that the pipes meet the precise requirements needed for their intended use.

These European standards harmonize technical specifications across member countries, supporting the efficiency and safety of stainless steel piping systems in various industries. When specifying stainless steel pipes, refer to the applicable EN standards to confirm the correct dimensions, tolerances, and technical delivery conditions.

The OD (outside diameter) and WT (wall thickness) combinations of this specification match those of EN 10220.

EN vs. ASME

EN 10220 and EN ISO 1127 pipe dimensions are specified by OD x WT in millimeters, while ASME B36.10/B36.19 use NPS and Schedule numbers. The two systems share some common OD values (e.g., 219.1mm, 323.9mm), but wall thicknesses do not always align. Always verify which standard applies to your project before ordering.

OD = Pipe outside diameter in mm WT = Pipe wall thickness in mm

OD (mm)	0.5	0.6	0.8	1	1.2	1.4	1.6	1.8	2	2.3	2.6	2.9	3.2	3.6	4	4.5	5	5.4	5.6	6.3
10.2	0.12	0.142	0.185	0.227	0.266	0.304	0.339	0.373	0.404	0.448	0.487
13.5	0.16	0.191	0.251	0.308	0.364	0.418	0.47	0.519	0.567	0.636	0.699	0.758	0.813	0.879
17.2	0.206	0.246	0.324	0.4	0.474	0.546	0.616	0.684	0.75	0.845	0.936	1.02	1.1	1.21	1.3	1.41
21.3	0.256	0.306	0.404	0.501	0.595	0.687	0.777	0.866	0.952	1.08	1.2	1.32	1.43	1.57	1.71	1.86	2.01	2.12
26.9	0.326	0.389	0.515	0.639	0.761	0.88	0.998	1.11	1.23	1.4	1.56	1.72	1.87	2.07	2.26	2.49	2.7	2.86	2.94	3.2
33.7	0.409	0.49	0.649	0.806	0.962	1.12	1.27	1.42	1.56	1.78	1.99	2.2	2.41	2.67	2.93	3.24	3.54	3.77	3.88	4.26
42.4	0.517	0.619	0.821	1.02	1.22	1.42	1.61	1.8	1.99	2.27	2.55	2.82	3.09	3.44	3.79	4.21	4.61	4.93	5.08	5.61
48.3		0.706	0.937	1.17	1.39	1.62	1.84	2.06	2.28	2.61	2.93	3.25	3.56	3.97	4.37	4.86	5.34	5.71	5.9	6.53
60.3		0.883	1.17	1.46	1.75	2.03	2.32	2.6	2.88	3.29	3.7	4.11	4.51	5.03	5.55	6.19	6.82	7.31	7.55	8.39
76.1			1.49	1.85	2.22	2.58	2.94	3.3	3.65	4.19	4.71	5.24	5.75	6.44	7.11	7.95	8.77	9.42	9.74	10.8
88.9			1.74	2.17	2.6	3.02	3.44	3.87	4.29	4.91	5.53	6.15	6.76	7.57	8.38	9.37	10.3	11.1	11.5	12.8
114.3					3.35	3.9	4.45	4.99	5.54	6.35	7.16	7.97	8.77	9.83	10.9	12.2	13.5	14.5	15	16.8
139.7							5.45	6.12	6.79	7.79	8.79	9.78	10.8	12.1	13.4	15	16.6	17.9	18.5	20.7
168.3							6.58	7.39	8.2	9.42	10.6	11.8	13	14.6	16.2	18.2	20.1	21.7	22.5	25.2
219.1								9.65	10.7	12.3	13.9	15.5	17	19.1	21.2	23.8	26.4	28.5	29.5	33.1
273									13.4	15.4	17.3	19.3	21.3	23.9	26.5	29.8	33	35.6	36.9	41.4
323.9											20.6	23	25.3	28.4	31.6	35.4	39.3	42.4	44	49.3
355.6											22.6	25.2	27.8	31.3	34.7	39	43.2	46.6	48.3	54.3
406.4											25.9	28.9	31.8	35.8	39.7	44.6	49.5	53.4	55.4	62.2
457													35.8	40.3	44.7	50.2	56.7	60.1	62.3	70
508													39.8	44.8	49.7	55.9	62	66.9	69.4	77.9
610													47.9	53.8	59.8	67.2	74.6	80.5	83.5	93.8
711															69.7	78.4	87.1	94	97.4	109
813															79.8	89.7	99.6	108	112	125
914															89.8	101	112	121	125	141
1016															99.8	112	125	135	140	157
1067																	131	141	147	165
1118																	137	148	154	173
1219																	150	162	168	188
1422																			196	220
1626																				252

EN 1127 Specification continued, for wall thicknesses above 6.1 mm:

OD	7,1	8	8,8	10	11	12,5	14,2	16	17,5	20	22,2	25	28	30	32	36	40	45	50	55	60	65
26,9	3,47	3,73
33,7	4,66	5,07	5,40
42,4	6,18	6,79	7,29	7,99
48,3	7,21	7,95	8,57	9,45	10,1	11,0
60,3	9,32	10,3	11,2	12,4	13,4	14,7	16,1	17,5
76,1	12,1	13,4	14,6	16,3	17,7	19,6	21,7	23,7	25,3	27,7
88,9	14,3	16,0	17,4	19,5	21,1	23,6	26,2	28,8	30,8	34,0	36,5	39,4
114,3	18,8	21,0	22,9	25,7	28,0	31,4	35,1	38,8	41,8	46,5	50,4	55,1	59,6	62,4	64,9
139,7	23,2	26,0	28,4	32,0	34,9	39,2	43,9	48,8	52,7	59,0	64,3	70,7	77,1	81,2	85,0	92,1	98,4
168,3	28,2	31,6	34,6	39,0	42,7	48,0	54,0	60,1	65,1	73,1	80,0	88,3	96,9	102	108	117	127	137	146
219,1	37,1	41,6	45,6	51,6	56,5	63,7	71,8	80,1	87,0	98,2	108	120	132	140	148	163	177	193	209	223	235	247
273	46,6	52,3	57,3	64,9	71,1	80,3	90,6	101	110	125	137	153	169	180	190	210	230	253	275	296	315	333
323,9	55,5	62,3	68,4	77,4	84,9	96,0	108	121	132	150	165	184	204	217	230	256	280	310	338	365	390	415
355,6	61,0	68,6	75,3	85,2	93,5	106	120	134	146	166	183	204	226	241	255	284	311	345	377	408	437	466
406,4	69,9	78,6	86,3	97,8	107	121	137	154	168	191	210	235	261	278	295	329	361	401	439	477	513	547
457	78,8	88,6	97,3	110	121	137	155	174	190	216	238	266	296	316	335	374	411	457	502	545	587	628
508	87,7	98,6	108	123	135	153	173	194	212	241	266	298	331	354	376	419	462	514	565	614	663	710
610	106	119	130	148	162	184	209	234	256	291	322	361	402	429	456	510	562	627	691	753	814	874
711	123	139	152	173	190	215	244	274	299	341	377	423	472	504	536	599	662	739	815	890	963	1036
813	141	159	175	198	218	247	280	314	343	391	433	486	542	579	616	690	763	852	941	1028	1114	1199
914	159	179	196	223	245	278	315	354	387	441	488	548	612	654	696	780	862	964	1065	1165	1264	1361
1016	177	199	219	248	273	309	351	395	431	491	544	611	682	729	777	870	963	1078	1191	1303	1415	1524
1067	186	209	230	261	286	325	369	415	453	516	572	642	717	767	817	915	1013	1134	1254	1373	1490	1606
1118	195	219	241	273	300	341	387	435	475	542	600	674	753	805	857	961	1063	1191	1317	1442	1556	1688
1219	212	239	263	298	328	372	422	475	519	591	655	736	822	880	937	1050	1163	1303	1441	1579	1715	1850

The EN 10220 specification can be purchased from the BSI online store.