Standards guide · Precision steel tubes

Precision steel tubes to EN 10305-4: dimensions, weights and limit deviations

Seamless cold drawn tubes for hydraulic and pneumatic pressure lines are governed by EN 10305-4. This page carries our dimension overview for them: for every dimension the weight per metre and the limit deviations that apply to it – and the way there through the dimension finder. It is the smallest and at the same time the most accurate of the pipe worlds on these knowledge pages: the permissible deviations here are in hundredths of a millimetre.

Standard: DIN EN 10305-4:2016-08
Manufacturing process: seamless, cold drawn
Outside diameter: 4–80 mm
Wall thicknesses: 1–10 mm

Dimension finder

Dimension finder: outside diameter and wall thickness

Select the outside diameter and the wall thickness – the drawing shows exactly this dimension, dimensioned, with the calculated inside diameter. Below it are all wall thicknesses that EN 10305-4 lists for this diameter. The preset is ⌀ 22 mm, a medium size of the first diameter series. The tables for the dimensions covered here are further down.

Outside diameter

Wall thickness

EN 10305-4 covers the greyed-out sizes. Our dimension overview lists them as order dimensions – see the table “Further deliverable dimensions” below.

Wall thicknesses for the selected outside diameter.
Twall thickness in mm	IDinside diameter in mm, calculated by us	Weightweight per metre in kg/m	per 6 mweight of a 6 m length in kg, calculated by us	Water contentlitres per metre, calculated by us	Cross-sectionsteel cross-sectional area in cm², calculated by us	Surfaceoutside surface area in m² per metre, calculated by us	Limit deviation ⌀permissible deviation of the outside diameter in mm	Limit deviation Tpermissible deviation of the wall thickness in mm

Without JavaScript this selection stays empty – the overview in the tables below is independent of it.

Dimension table

Zickwolff dimension table (standard reference EN 10305-4)

One row per dimension, and every row carries everything that belongs to it: wall thickness, weight per metre and both limit deviations. Ø series is the diameter series of EN 10220 – it belongs to the outside diameter, not to the wall thickness.

Five columns are calculated by us, the standard does not list them: the inside diameter as D − 2 × T, the water content as the clear cross-sectional area times one metre, the steel cross-section as the annular area, the weight per 6 m as weight per metre times 6 and the surface as the outer circumference times one metre. All are nominal values without a tolerance of their own – how far they may deviate in a given case follows from the limit deviations for outside diameter and wall thickness.
Standard reference for the limit deviations: EN 10305-4, Table 4 of the standard. The column per 6 m is a calculation aid and not a commitment on the delivery length; which lengths are customary is stated under Lengths.

¹ This dimension lies outside the preferred dimensions of EN 10220: the standard grades outside diameters and wall thicknesses, and this combination is not part of that grading. It is listed here nevertheless, because it exists. A dash in the Ø series column means that the outside diameter itself is not in the series of EN 10220 either.

Doutside diameter in mm	⌀ seriesdiameter series to EN 10220	Twall thickness in mm	IDinside diameter in mm, calculated by us	Weightweight per metre in kg/m	per 6 mweight of a 6 m length in kg, calculated by us	Water contentlitres per metre, calculated by us	Cross-sectionsteel cross-sectional area in cm², calculated by us	Surfaceoutside surface area in m² per metre, calculated by us	Limit deviation ⌀permissible deviation of the outside diameter in mm	Limit deviation Tpermissible deviation of the wall thickness in mm
4	-	1	2.0	0.0740	0.44	0.003	0.094	0.013	±0.08	±0.100
5	-	1	3.0	0.0986	0.59	0.007	0.126	0.016	±0.08	±0.100
6	-	1	4.0	0.123	0.74	0.013	0.157	0.019	±0.08	±0.100
6	-	1.5	3.0	0.166	1.00	0.007	0.212	0.019	±0.08	±0.150

Show full table · more than 80 rows

Outside diameters from 4 to 80 mm with the associated wall thicknesses; linear dimensions in millimetres, weight in kg/m, water content in l/m.
Doutside diameter in mm	⌀ seriesdiameter series to EN 10220	Twall thickness in mm	IDinside diameter in mm, calculated by us	Weightweight per metre in kg/m	per 6 mweight of a 6 m length in kg, calculated by us	Water contentlitres per metre, calculated by us	Cross-sectionsteel cross-sectional area in cm², calculated by us	Surfaceoutside surface area in m² per metre, calculated by us	Limit deviation ⌀permissible deviation of the outside diameter in mm	Limit deviation Tpermissible deviation of the wall thickness in mm
4	-	1	2.0	0.0740	0.44	0.003	0.094	0.013	±0.08	±0.100
5	-	1	3.0	0.0986	0.59	0.007	0.126	0.016	±0.08	±0.100
6	-	1	4.0	0.123	0.74	0.013	0.157	0.019	±0.08	±0.100
6	-	1.5	3.0	0.166	1.00	0.007	0.212	0.019	±0.08	±0.150
6	-	2	2.0	0.197	1.18	0.003	0.251	0.019	±0.08	±0.200
8	-	1	6.0	0.173	1.04	0.028	0.220	0.025	±0.08	±0.100
8	-	1.5	5.0	0.240	1.44	0.020	0.306	0.025	±0.08	±0.150
8	-	2	4.0	0.296	1.78	0.013	0.377	0.025	±0.08	±0.200
10	-	1	8.0	0.222	1.33	0.050	0.283	0.031	±0.08	±0.100
10	-	1.5	7.0	0.314	1.88	0.038	0.401	0.031	±0.08	±0.150
10	-	2	6.0	0.395	2.37	0.028	0.503	0.031	±0.08	±0.200
10	-	2.5	5.0	0.462	2.77	0.020	0.589	0.031	±0.08	±0.250
12	-	1	10.0	0.271	1.63	0.079	0.346	0.038	±0.08	±0.100
12	-	1.5	9.0	0.388	2.33	0.064	0.495	0.038	±0.08	±0.150
12	-	2	8.0	0.493	2.96	0.050	0.628	0.038	±0.08	±0.200
12	-	2.5	7.0	0.586	3.52	0.038	0.746	0.038	±0.08	±0.250
12	-	3	6.0	0.666	4.00	0.028	0.848	0.038	±0.08	±0.300
14	-	1	12.0	0.321	1.93	0.113	0.408	0.044	±0.08	±0.100
14	-	1.5	11.0	0.462	2.77	0.095	0.589	0.044	±0.08	±0.150
14	-	2	10.0	0.592	3.55	0.079	0.754	0.044	±0.08	±0.200
14	-	2.5	9.0	0.709	4.25	0.064	0.903	0.044	±0.08	±0.250
14	-	3	8.0	0.814	4.88	0.050	1.037	0.044	±0.08	±0.300
15	-	1	13.0	0.345	2.07	0.133	0.440	0.047	±0.08	±0.100
15	-	1.5	12.0	0.499	2.99	0.113	0.636	0.047	±0.08	±0.150
15	-	2	11.0	0.641	3.85	0.095	0.817	0.047	±0.08	±0.200
15	-	2.5	10.0	0.771	4.63	0.079	0.982	0.047	±0.08	±0.250
16	-	1	14.0	0.370	2.22	0.154	0.471	0.050	±0.08	±0.100
16	-	1.5	13.0	0.536	3.22	0.133	0.683	0.050	±0.08	±0.150
16	-	2	12.0	0.691	4.15	0.113	0.880	0.050	±0.08	±0.200
16	-	2.5	11.0	0.832	4.99	0.095	1.060	0.050	±0.08	±0.250
16	-	3	10.0	0.962	5.77	0.079	1.225	0.050	±0.08	±0.300
18	-	1	16.0	0.419	2.51	0.201	0.534	0.057	±0.08	±0.100
18	-	1.5	15.0	0.610	3.66	0.177	0.778	0.057	±0.08	±0.150
18	-	2	14.0	0.789	4.73	0.154	1.005	0.057	±0.08	±0.200
18	-	2.5	13.0	0.956	5.74	0.133	1.217	0.057	±0.08	±0.250
18	-	3	12.0	1.11	6.66	0.113	1.414	0.057	±0.08	±0.300
20	-	1.5	17.0	0.684	4.10	0.227	0.872	0.063	±0.08	±0.150
20	-	2	16.0	0.888	5.33	0.201	1.131	0.063	±0.08	±0.200
20	-	2.5	15.0	1.08	6.48	0.177	1.374	0.063	±0.08	±0.250
20	-	3	14.0	1.26	7.56	0.154	1.602	0.063	±0.08	±0.300
20	-	3.5	13.0	1.42	8.52	0.133	1.814	0.063	±0.08	±0.350
20	-	4	12.0	1.58	9.48	0.113	2.011	0.063	±0.08	±0.400
22	-	1	20.0	0.518	3.11	0.314	0.660	0.069	±0.08	±0.100
22	-	1.5	19.0	0.758	4.55	0.284	0.966	0.069	±0.08	±0.150
22	-	2	18.0	0.986	5.92	0.254	1.257	0.069	±0.08	±0.200
22	-	2.5	17.0	1.20	7.20	0.227	1.532	0.069	±0.08	±0.250
22	-	3	16.0	1.41	8.46	0.201	1.791	0.069	±0.08	±0.300
22	-	4	14.0	1.78	10.7	0.154	2.262	0.069	±0.08	±0.400
25	-	1¹	23.0	0.592	3.55	0.415	0.754	0.079	±0.08	±0.100
25	-	1.5	22.0	0.869	5.21	0.380	1.107	0.079	±0.08	±0.150
25	-	2	21.0	1.13	6.78	0.346	1.445	0.079	±0.08	±0.200
25	-	2.5	20.0	1.39	8.34	0.314	1.767	0.079	±0.08	±0.250
25	-	3	19.0	1.63	9.78	0.284	2.073	0.079	±0.08	±0.300
25	-	4	17.0	2.07	12.4	0.227	2.639	0.079	±0.08	±0.400
25	-	4.5	16.0	2.28	13.7	0.201	2.898	0.079	±0.08	±0.450
25	-	5	15.0	2.47	14.8	0.177	3.142	0.079	±0.08	±0.500
28	-	1.5	25.0	0.980	5.88	0.491	1.249	0.088	±0.08	±0.150
28	-	2	24.0	1.28	7.68	0.452	1.634	0.088	±0.08	±0.200
28	-	2.5	23.0	1.57	9.42	0.415	2.003	0.088	±0.08	±0.250
28	-	3	22.0	1.85	11.1	0.380	2.356	0.088	±0.08	±0.300
28	-	4	20.0	2.37	14.2	0.314	3.016	0.088	±0.08	±0.400
28	-	5	18.0	2.84	17.0	0.254	3.613	0.088	±0.08	±0.500
30	-	2	26.0	1.38	8.28	0.531	1.759	0.094	±0.08	±0.200
30	-	2.5	25.0	1.70	10.2	0.491	2.160	0.094	±0.08	±0.250
30	-	3	24.0	2.00	12.0	0.452	2.545	0.094	±0.08	±0.300
30	-	4	22.0	2.56	15.4	0.380	3.267	0.094	±0.08	±0.400
30	-	5	20.0	3.08	18.5	0.314	3.927	0.094	±0.08	±0.500
35	-	2	31.0	1.63	9.78	0.755	2.073	0.110	±0.15	±0.200
35	-	2.5	30.0	2.00	12.0	0.707	2.553	0.110	±0.15	±0.250
35	-	3	29.0	2.37	14.2	0.661	3.016	0.110	±0.15	±0.300
35	-	4	27.0	3.06	18.4	0.573	3.896	0.110	±0.15	±0.400
35	-	5	25.0	3.70	22.2	0.491	4.712	0.110	±0.15	±0.500
38	-	2.5	33.0	2.19	13.1	0.855	2.788	0.119	±0.15	±0.250
38	-	3	32.0	2.59	15.5	0.804	3.299	0.119	±0.15	±0.300
38	-	4	30.0	3.35	20.1	0.707	4.273	0.119	±0.15	±0.400
38	-	5	28.0	4.07	24.4	0.616	5.184	0.119	±0.15	±0.500
38	-	6	26.0	4.74	28.4	0.531	6.032	0.119	±0.15	±0.600
42	-	2	38.0	1.97	11.8	1.13	2.513	0.132	±0.20	±0.200
42	-	3	36.0	2.89	17.3	1.02	3.676	0.132	±0.20	±0.300
50	-	4	42.0	4.54	27.2	1.39	5.781	0.157	±0.20	±0.400
50	-	5	40.0	5.55	33.3	1.26	7.069	0.157	±0.20	±0.500
50	-	6	38.0	6.51	39.1	1.13	8.294	0.157	±0.20	±0.600
50	-	8	34.0	8.29	49.7	0.908	10.56	0.157	±0.20	±0.800
55	-	4	47.0	5.03	30.2	1.73	6.409	0.173	±0.25	±0.400
60	-	5	50.0	6.78	40.7	1.96	8.639	0.188	±0.25	±0.500
70	-	5	60.0	8.01	48.1	2.83	10.21	0.220	±0.30	±0.500
80	-	6	68.0	10.9	65.4	3.63	13.95	0.251	±0.35	±0.600
80	-	10	60.0	17.3	103.8	2.83	21.99	0.251	±0.35	±1.00

Further deliverable dimensions (13)

outside diameter in mm	wall thickness in mm	inside diameter in mm, calculated by us	weight per metre in kg/m
4	0.5	3.0	0.0432
5	0.75	3.5	0.0786
15	3	9.0	0.888
22	3.5	15.0	1.60

Show full table · more than 10 rows

Further deliverable dimensions – 13 rows, all dimensions in millimetres.
outside diameter in mm	wall thickness in mm	inside diameter in mm, calculated by us	weight per metre in kg/m
4	0.5	3.0	0.0432
5	0.75	3.5	0.0786
15	3	9.0	0.888
22	3.5	15.0	1.60
30	6	18.0	3.55
35	6	23.0	4.29
38	2	34.0	1.78
42	4	34.0	3.75
42	5	32.0	4.56
50	9	32.0	9.10
50	10	30.0	9.86
60	8	44.0	10.3
60	10	40.0	12.3

Order dimensions and values calculated by us; deliverable from stock or procured, availability on request. Limit deviations and figures from the standard: see the main table and the standard itself.

The standard names dimensions. What is listed here is deliverable – from stock or procured; how quickly a size is available we clarify on request.

What has changed since the earlier edition

For the hydraulic tube (precision tube), the comparison covers the editions from DIN EN 10305-4:2011-04. Not yet recorded: DIN 2391-C and edition 2003-10.

DIN EN 10305-4:2011-04 → DIN EN 10305-4:2016-08

system
The tubes are now preferably ordered by outside diameter and wall thickness.

editions 2011-04 and 2016-08 · National foreword, clause 8.5.1.1
system
The option numbers have been reassigned for all six parts of the 10305 series and are now the same across the parts.

editions 2011-04 and 2016-08 · National foreword
system
The drift expanding test is now, besides the tensile test, the second standard test of the mechanical testing.

editions 2011-04 and 2016-08 · National foreword

These entries say what the standard has changed. They say nothing about material, pressure rating, scope of testing or the condition of an installed part — and nothing about whether an existing part can continue to be used. That assessment remains with the specific plant.

Lengths

Lengths: what the standard leaves open and what the market supplies

EN 10305-4 does not specify a length. Tubes are supplied in random lengths, whose range is part of the order and is agreed there. Exact lengths with their own limit deviations are possible, but a design that has to be agreed expressly – not the normal case. That is why the drawing on this page carries no length dimension and shows the tube broken off on the right: the length is not a property of the dimension but a matter of the order.

Customary on the market are 4 to 7 m, special lengths on request. That is the standard length that stockholders and mills supply for tubes of this manufacturing process – seamless, cold drawn, a figure taken from stock programmes, not from the standard. Whoever needs a specific length states it in the inquiry; whoever plans a quantity calculates with it.

The column per 6 m in the tables on this page calculates with 6 m, because that is the round figure within this range. It is a calculation aid and not a commitment: for a different length take the Weight column (kg per m) and multiply yourself.

How the figures are derived

How weight and limit deviations come about

The weight per metre is a calculation, not a table entry: outside diameter and wall thickness give the cross-sectional area of the tube, times the density of steel of 7.85 kg/dm³. We calculate it to EN 10220 for every dimension in this overview – which is why every row shows a figure and nowhere a dash.

A limit deviation is not a property of the row but a figure that refers to the nominal dimension. For the outside diameter the permissible deviation cannot be derived from a single ratio – it depends on the diameter range. The overview therefore shows for each dimension the figure that applies to it. For the wall thickness the permissible deviation cannot be derived from a single ratio – it depends on the diameter range. The overview therefore shows for each dimension the figure that applies to it. We calculate it for every dimension in this overview, so that the row shows the figure and not a percentage that one would still have to apply oneself.

Whoever inspects a tube needs exactly this one figure; the derivation does not help him with it.

Workmanship

How to measure correctly

A tube is identified by two measurements: outside diameter D and wall thickness T. Measure D with a calliper in two directions at right angles – the difference is the out-of-roundness – and T at the tube end. The inside diameter is not measured but calculated: D minus twice T.

Workmanship and testing: what is not a dimension

Not everything that has to be right about a tube is in the dimension table. How unevenly the wall may be distributed around the circumference, how straight it has to be and how round the cross-section has to be – that too is part of the workmanship, and at incoming inspection it helps decide whether a delivery is accepted. Added to this is what can be seen on the delivery: the surface, the ends, the marking and the protection on the way to site.

What is measured on the tube

Straightness – D over 15 mm, lengths over 1 m: at most 0.0015 L per tube length, related to one metre at most 3 mm · option 22: reduced deviation
Out-of-roundness – all: no separate limit – included in the limit deviations of the diameter · up to 100 mm from the tube end the diameters may lie outside the limit deviations owing to cutting
Eccentricity – ordered to D and d: (Tmax − Tmin) / (Tmax + Tmin) × 100 at most 10 %, in the same cross-sectional plane

Delivery and marking

Surface condition – all: surface in the condition typical of the manufacturing process and heat treatment · smooth inside and outside with a roughness Ra of at most 4 µm (inside from an inside diameter of 15 mm) · option 7: inside Ra at most 2 µm, option 8: roughness measured and stated, option 4: condition for further processing as specified by the purchaser · rework only by grinding or machining, without going below the minimum wall thickness
Tube ends – all: cut square to the tube axis and free from excessive burrs · under D 8 mm or inside diameter 4 mm the ends may be deformed · no bevelling provided for
Marking – all: durable on every tube, continuously along the length at intervals of at most 1.5 m (5 % of the tubes with only one marking): manufacturer, nominal dimensions, EN 10305-4, steel name, with specific inspection identification number · option 28: other marking as agreed · with electroplated coating (options 33 to 36) also a label on the bundle
Surface protection – all: with temporary corrosion protection at the manufacturer's choice, foreign matter inside the tube is to be prevented · option 31 phosphated, options 33 to 36 outside galvanised and chromated (blue-white, yellow or olive), or galvanised and passivated (Cr(VI)-free), option 37 ends with plugs or caps · delivery in bundles, from D 12 mm polygonal, option 38: other packaging
The standard supplies the tube with a temporary corrosion protection of the manufacturer's choice; type and extent can be specified in the order. Surface finishing to customer specification – pickling, priming, painting – is a matter of the order, not of the dimension.

Standard reference for these details: EN 10305-4. What is stated here is the requirement – it is measured on the delivered tube, and where a tolerance class or an option comes into play, it belongs in the order.

In practice

From practice: where ordering goes wrong

Ordering is by outside and inside diameter or by outside diameter and wall thickness. Both ways are common, and they do not necessarily lead to the same tube. Anyone who names only two of the three dimensions leaves the third to the supplier.

Accuracy is the reason this tube exists. A precision tube is screwed, cut and bent without being reworked afterwards. That is why the limit deviations here do not hang on a percentage but are laid down individually for every combination.

The delivery condition decides how the tube can be worked. Whether a tube can still be bent and flared depends on the condition it is delivered in – not on the dimension.

Limits of this page

What this page does not say

No material selection. EN 10305-4 carries the non-alloy steel grades E215, E235 and E355 in several delivery conditions. Which one suits your case is decided by working pressure, bending work and design – not by the dimension. The materials overview puts the grades in context.
No design calculation. Diameter and wall thickness do not yield a permissible working pressure. That calculation belongs to plant engineering.
Only this one standard. Precision steel tubes without a hydraulic reference are covered by EN 10305-1 to -3, welded hydraulic tubes by EN 10305-6, pressure tubes for plants by EN 10216 and EN 10217. The overview is on the page Steel pipes.

Frequently asked questions

What does EN 10305-4 govern?

The standard applies to seamless cold drawn precision steel tubes for hydraulic and pneumatic pressure lines. It lays down dimensions, limit deviations, materials and delivery conditions.

How much does one metre of tube weigh?

The weight per metre is shown in this overview for every dimension. It is calculated from outside diameter and wall thickness.

Why is no percentage given here for the limit deviations?

Because the standard does not lay them down as a ratio for this tube, but individually for every combination of diameter and wall thickness. The overview therefore shows, for each dimension, the figure that applies to it.

What is the eccentricity?

A measure of how unevenly the wall is distributed around the circumference – formed from the largest and the smallest wall thickness in the same cross-section. In a tube under pressure the thinnest point is the governing one.

Precision steel tubes – ask our warehouse

Send us the outside diameter and wall thickness (or outside and inside diameter), the material, the delivery condition and the inspection document required.

Send an inquiry

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