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Cold Drawn Seamless Steel Tube

Bright annealed cold drawn steel tube with smooth internal and external surface

Tubos sin costura estirados en frío de alta precisión para sistemas hidráulicos

Small diameter cold drawn seamless tubing ASTM A179 for heat exchangers

Product Name: Cold Drawn Seamless Steel Tube, CDS Tube, Precision Steel Tube
Outer Diameter: 6.0 mm - 323.9 mm
Wall Thickness: 0.5 mm - 30 mm
Length: 1 m - 12 m or custom length
Standards: ASTM A519, EN 10305-1, DIN 2391, JIS G3445
Grades: 1010, 1020, 1045, 4130, 4140, E215, E235, E355, ST35, ST45, ST52, STKM 11A, STKM 12A, STKM 13A
Delivery Condition: BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N)
Ends: square cut, plain ends, deburred ends; beveled or threaded ends upon request
Applications: Automotive parts, hydraulic and pneumatic cylinders, mechanical machining, precision engineering, heat exchangers and pressure pipelines

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Overview
Specification
Standard
Process
FAQ

Cold Drawn Seamless Steel Tube for Precision Mechanical and Hydraulic Applications

Cold drawn seamless steel tube is used for precision mechanical parts, hydraulic and pneumatic cylinders, automotive components, machining parts and high-accuracy structural applications. Compared with hot-rolled seamless pipe, cold drawn tube offers tighter dimensional tolerances, smoother surface finish and improved dimensional consistency. Buyers should confirm the standard, steel grade, outside diameter, wall thickness, tolerance, delivery condition, surface finish and end finish before quotation.

Common Standards and Steel Grades

We manufacture and stock a wide range of CDS tubes to meet specific mechanical and structural requirements:

ASTM A519: Standard specification for seamless carbon and alloy steel mechanical tubing.

Common Grades: 1010, 1020, 1045, 4130, 4140.

ASTM A179 (ASME SA179): Seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes.

DIN 2391 / EN 10305-1: Steel tubes for precision applications.

Grades: ST35, ST45, ST52, E215, E235, E355.

ASTM A106 / A53 Grade B: For high-pressure and high-temperature precision piping.

Dimensions and Technical Specifications

Precision is the hallmark of cold-drawn products. Our facility offers the following sizing capabilities:

Feature	Specification Range
Outer Diameter (OD)	1/8” to 12” (3.18mm – 323.8mm)
Wall Thickness (WT)	0.5mm to 25mm (Ultra-thin to Heavy Wall)
Length	Up to 12m, Fixed Length, or U-Bent for heat exchangers
Tolerances	OD: ±0.05mm to ±0.1mm; WT: ±5% to ±7.5%
Surface Finish	Bright Annealed, Polished, or Oiled (Scale-free)
Delivery Condition	BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N)

Core Application Fields

Because of their high precision and strength, CDS pipes are essential in high-performance engineering:

Automotive & Aerospace: Hydraulic cylinders, drive shafts, shock absorbers, and structural frames.

Heat Exchangers & Condensers: High-efficiency thermal transfer tubing for power plants and refineries.

Hydraulic & Pneumatic Systems: Precision fluid power lines where tight seals are mandatory.

Machinery Manufacturing: Bearings, bushings, and high-speed rotating components.

Oil & Gas: Instrumentation tubing and downhole tools requiring exact diameters.

Cold Drawn Seamless (CDS) Mechanical Tubing Range of Sizes

OUTSIDE

DIAMETER

MINIMUM WALL

1.2

1.5

1.7

1.8

2.1

2.4

2.8

3.0

3.4

4.0

4.2

4.8

5.2

5.6

6.4

7.1

8.0

8.3

8.7

9.5

11.1

11.9

12.7

0.049

0.058

0.065

0.072

0.083

0.095

0.109

0.120

0.134

0.156

0.165

0.188

0.203

0.219

0.250

0.281

0.313

0.325

0.344

0.375

0.438

0.469

0.500

12.7

0.500

•

14.3

0.563

•

15.9

0.625

•

19.1

0.750

•

22.2

0.875

•

25.4

1.000

•

28.6

1.125

•

31.8

1.250

•

34.9

1.375

•

38.1

1.500

•

41.3

1.625

•

44.5

1.750

•

47.6

1.875

•

50.8

2.000

•

54.0

2.125

•

57.2

2.250

•

60.3

2.375

•

63.5

2.500

•

66.7

2.625

•

69.9

2.750

•

73.0

2.875

•

76.2

3.000

•

79.4

3.125

•

82.6

3.250

•

85.7

3.375

•

88.9

3.500

•

101.6

4.000

•

114.3

4.500

•

127.0

5.000

•

139.7

5.500

•

Comparative Data Seamless Carbon Steels
Condition	Nominal Yield Strength psi	Nominal Ultimate Strength psi	Nominal Elongation in 2%	Equivalent Rockwell Hardness	Equivalent Brinell Hardness
GRADE 1018 c .15/.20 Mn .60/90 P .40 max S .050 max
Hot-Rolled	35,000	60,000	30	B-68	116
Normalized	38,000	58,000	35	B-66	114
Soft-Annealed	33,000	50,000	40	B-57	97
As-Drawn	70,000	85,000	10	B-87	170
CD-Stress Relief Annealed	60,000	80,000	15	B-85	163

GRADE 1020 C. 18/.23 Mn .30/.60 P .040 max S .050 max
Hot-Rolled	38,000	60,000	30	B-68	116
Normalized	40,000	58,000	35	B-66	114
Soft-Annealed	33,000	53,000	40	B-62	105
As-Drawn	65,000	80,000	10	B-85	163
CD-Stress Relief Annealed	60,000	75,000	15	B-81	149

GRADE 1026 C .22/.28 Mn .60/.90 P .030 max S .050 max
Hot-Rolled	47,000	70,000	28	B-77	137
Normalized	50,000	67,000	33	B-74	131
Soft-Annealed	36,000	60,000	35	B-68	116
As-Drawn	72,000	87,000	10	B-89	179
CD-Stress Relief Annealed	65,000	82,000	15	B-86	167

WALL THICKNESS TOLERANCES FOR ROUNDa,b,c COLD-WORKED SEAMLESS TUBING PER ASTM A519
Cold Drawn Maximum % Over and Under Nominal		Wall Thickness % of OD
ID Up To 1.499 Inches	ID 1.500 Inches and Over	Wall Thickness % of OD
10	7.5	25 and Under
12.5	10	Over 2

*ID Tolerances apply to dimensions 0.625 inch and over when ID is at least half the OD
1:Many tubes with inside diameter less than 50% of outside diameter or with wall thickness more than 25% of outside diameter, or with wall thickness over 11¼4 in., or weighing more than 90 lb/ft, are difficult to draw over a mandrel. Therefore, the inside diameter can vary over or under by an amount equal to 10% of the wall thickness. See also Footnote B.

2:For those tubes with inside diameter less than 1/2 in. (or less than 5/8 in. when the wall thickness is more than 20% of the outside diameter), which are not commonly drawn over a mandrel. Footnote A is not applicable. Therefore, for those tubes, the inside diameter is goverened by the outside diameter tolerance shown in thiis table and the wall thicnkess tolerances shown in Table 9.

3:Tubing having a wall thickness less than 3% of the outside diameter cannot be straightened properly without a certain amount of distortion. Consequently such tubes, while having an average outside diameter and inside diameter within the tolerances shown in this table, require an ovality tolerance of 1/2% over and under nominal outside diameter, this being in addition to the tolerances indicated in this table.

Cold Drawn Seamlesstube Production Process

Frequently Asked Questions

1. When do buyers usually move from general seamless pipe to cold drawn tube?

They usually move when dimensional accuracy, surface finish, and tolerance control matter more than general pressure service description. The decision often comes from machining or assembly needs, not just from material type. Typical long-tail uses include cold drawn seamless tube for hydraulic cylinders, precision steel tube for machining parts, and seamless mechanical tube with tight tolerance.

2. Why can cold drawn tube quotes feel less comparable than expected?

Because tolerance, straightness, heat treatment, and finish quality can change the real value of the offer even if the nominal size looks the same. Buyers often need more than a simple size-to-price comparison. This often happens when buyers compare cold drawn precision tube with ordinary hot finished seamless pipe for mechanical engineering projects.

3. What kind of buyer question usually gets the best answer on cold drawn tube?

Questions about final use in machining, hydraulic parts, or precision assembly tend to get the most useful feedback. Those use cases tell the supplier what accuracy matters most. That comes up most in hydraulic systems, auto parts, precision shafts, and machinery component fabrication.

4. What is the most common mistake when purchasing cold drawn tube?

The most common mistake is treating it like ordinary seamless pipe and not stating the tolerance or finish expectations clearly enough. That usually leads to avoidable second-round clarification. The biggest mistakes happen in precision steel tube orders where tolerance and finish are assumed instead of written into the RFQ.

Cold Drawn Seamless (CDS) Mechanical Tubing Range of Sizes

OUTSIDE

DIAMETER

MINIMUM WALL

1.2

1.5

1.7

1.8

2.1

2.4

2.8

3.0

3.4

4.0

4.2

4.8

5.2

5.6

6.4

7.1

8.0

8.3

8.7

9.5

11.1

11.9

12.7

0.049

0.058

0.065

0.072

0.083

0.095

0.109

0.120

0.134

0.156

0.165

0.188

0.203

0.219

0.250

0.281

0.313

0.325

0.344

0.375

0.438

0.469

0.500

12.7

0.500

•

14.3

0.563

•

15.9

0.625

•

19.1

0.750

•

22.2

0.875

•

25.4

1.000

•

28.6

1.125

•

31.8

1.250

•

34.9

1.375

•

38.1

1.500

•

41.3

1.625

•

44.5

1.750

•

47.6

1.875

•

50.8

2.000

•

54.0

2.125

•

57.2

2.250

•

60.3

2.375

•

63.5

2.500

•

66.7

2.625

•

69.9

2.750

•

73.0

2.875

•

76.2

3.000

•

79.4

3.125

•

82.6

3.250

•

85.7

3.375

•

88.9

3.500

•

101.6

4.000

•

114.3

4.500

•

127.0

5.000

•

139.7

5.500

•

Comparative Data Seamless Carbon Steels
Condition	Nominal Yield Strength psi	Nominal Ultimate Strength psi	Nominal Elongation in 2%	Equivalent Rockwell Hardness	Equivalent Brinell Hardness
GRADE 1018 c .15/.20 Mn .60/90 P .40 max S .050 max
Hot-Rolled	35,000	60,000	30	B-68	116
Normalized	38,000	58,000	35	B-66	114
Soft-Annealed	33,000	50,000	40	B-57	97
As-Drawn	70,000	85,000	10	B-87	170
CD-Stress Relief Annealed	60,000	80,000	15	B-85	163

GRADE 1020 C. 18/.23 Mn .30/.60 P .040 max S .050 max
Hot-Rolled	38,000	60,000	30	B-68	116
Normalized	40,000	58,000	35	B-66	114
Soft-Annealed	33,000	53,000	40	B-62	105
As-Drawn	65,000	80,000	10	B-85	163
CD-Stress Relief Annealed	60,000	75,000	15	B-81	149

GRADE 1026 C .22/.28 Mn .60/.90 P .030 max S .050 max
Hot-Rolled	47,000	70,000	28	B-77	137
Normalized	50,000	67,000	33	B-74	131
Soft-Annealed	36,000	60,000	35	B-68	116
As-Drawn	72,000	87,000	10	B-89	179
CD-Stress Relief Annealed	65,000	82,000	15	B-86	167

WALL THICKNESS TOLERANCES FOR ROUNDa,b,c COLD-WORKED SEAMLESS TUBING PER ASTM A519
Cold Drawn Maximum % Over and Under Nominal		Wall Thickness % of OD
ID Up To 1.499 Inches	ID 1.500 Inches and Over	Wall Thickness % of OD
10	7.5	25 and Under
12.5	10	Over 2

Cold Drawn Seamlesstube Production Process

Frequently Asked Questions

1. When do buyers usually move from general seamless pipe to cold drawn tube?

2. Why can cold drawn tube quotes feel less comparable than expected?

3. What kind of buyer question usually gets the best answer on cold drawn tube?

4. What is the most common mistake when purchasing cold drawn tube?

Prev : Low Temperature Seamless Steel Pipe
Next : Heat Exchanger Tubes
Tags : cold drawn seamless steel tube , CDS tube , precision steel tube , cold drawn tube , ASTM A519 seamless tube

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