Seamless
Cold Drawn Seamless
Cold-drawn seamless tubes with precision tolerances, refined grain structure, and superior surface finish — the secondary process that transforms hot-finished mother tubes into precision products.
Cold drawn seamless tubes
OVERVIEW
Precision from the drawing die.
Global Seamless produces cold-drawn seamless (CDS) tubes by drawing hot-finished mother tubes through a die at ambient temperature. This cold-working process refines the grain structure, tightens dimensional tolerances to ±0.004 in (±0.10 mm) on OD, and delivers a superior surface finish.
CDS tubes are preferred for heat exchangers, superheaters, hydraulic cylinders, instrumentation, and any application where precise wall thickness control, concentricity, and surface quality directly affect performance and service life.
✓ OD tolerance: ±0.004 in (±0.10 mm) to ±0.010 in (±0.25 mm)
✓ WT tolerance: ±10%
✓ Surface finish: Ra 63 μin (1.6 μm) standard, bright anneal option
✓ Carbon, alloy, and stainless grades
✓ 100% Eddy Current and Ultrasonic NDT
✓ WT tolerance: ±10%
✓ Surface finish: Ra 63 μin (1.6 μm) standard, bright anneal option
✓ Carbon, alloy, and stainless grades
✓ 100% Eddy Current and Ultrasonic NDT
Cold drawn seamless precision tubes
DIMENSIONAL SPECIFICATIONS
Available size range.
Cold Drawn Seamless (CDS)
| Outside Diameter (OD) | Wall Thickness (WT) | Length | OD Tolerance |
|---|---|---|---|
| 0.394 – 1.000 in (10.00 – 25.40 mm) | 0.035 – 0.157 in (0.89 – 4.00 mm) | up to 42 ft (12.8 m) | ±0.004 in (±0.10 mm) |
| 1.000 – 2.000 in (25.40 – 50.80 mm) | 0.059 – 0.315 in (1.50 – 8.00 mm) | up to 42 ft (12.8 m) | ±0.006 in (±0.15 mm) |
| 2.000 – 4.000 in (50.80 – 101.60 mm) | 0.079 – 0.472 in (2.00 – 12.00 mm) | up to 42 ft (12.8 m) | ±0.008 in (±0.20 mm) |
| 4.000 – 6.625 in (101.60 – 168.30 mm) | 0.118 – 0.551 in (3.00 – 14.00 mm) | up to 42 ft (12.8 m) | ±0.010 in (±0.25 mm) |
APPLICATIONS & INDUSTRIES
Where these tubes get used.
Precision condenser and heat exchanger tubes requiring tight tolerances and surface finish.
CDS superheater and reheater tubes where wall thickness precision drives thermal efficiency.
MATERIAL GRADES
Precision · bright anneal · and honed.
STANDARD CDS
Mill Finish
Cold drawn with standard mill surface — boiler tubes, mechanical, and general applications.
BRIGHT ANNEAL
BA Finish
Bright-annealed in protective atmosphere for clean oxide-free surface and refined microstructure.
HONED / SRB
Precision Bore
Honed or skived & roller-burnished bore for direct hydraulic cylinder service.
TECHNICAL ARTICLES
Latest insights on cold drawn tubes.
ARTICLE
Cold Drawing Process
Step-by-step guide to the cold-drawing manufacturing process.
ARTICLE
Bright Annealing vs Pickling
Comparing surface treatment options for cold drawn tubes.
ARTICLE
OD WT Tolerances CDS
How cold drawing achieves tighter dimensional control than hot finishing.
RELATED PRODUCTS
Often paired with.
GET A QUOTE
Send your cold drawn tube spec.
Get a proposal in one business day.
OD, WT, length, grade, surface finish, quantity — we revert with a technical & commercial proposal.