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Product Description

Product Description

Specify Material, Finish and Component Duty Together

ASTM A519/A519M covers several grades of seamless carbon and alloy steel mechanical tubing supplied hot-finished or cold-finished.

This factory page focuses on round, cold-finished seamless tube within the confirmed production range. Grade, unit system, dimensions, finish, heat treatment, mechanical properties and supplementary inspection requirements must be stated on the purchase order.

Product focus: round seamless mechanical tubing for machining and fabrication. Square, rectangular and special sections are outside this page unless separately reviewed.

DIMENSIONS AND TOLERANCES

Build Machining Allowance Into the Tube Order

Mechanical-tube buyers should define the dimensions that control finished-part yield, not only the nominal tube size.

≡ OD  Outside Diameter  :       State the nominal size and ordered tolerance basis.
≡ ID    Inside Diameter     :       Control directly where component fit or machining stock requires it.

≡ WT  Wall Thickness      :       Confirm nominal wall and allowable variation before production.

≡ O     Roundness             :       Review for chucking, forming, sealing and component assembly.

≡ S     Straightness           :      Define the inspection method and application requirement on the order.

≡ Ra  Surface Quality       :      State visual, roughness or downstream-finishing requirements where needed.

Specification

IMPORTANT PARAMETERS
Product type	Round seamless mechanical steel tube, cold-finished focus
Standard focus	ASTM A519/A519M, edition stated on the order
Common grade directions	1010 / 1020/1035/1045 / 4130 / 4140, subject to order and capability review
Outside diameter	15-70 mm
Wall thickness	1-14 mm
Length	Random, fixed or cut-to-length according to order
Dimension basis	OD x wall, OD x ID or machining-stock requirement as agreed
Finish / condition	Cold-finished, stress-relieved, annealed or normalized direction as ordered
Unit system	Use inch-pound or SI requirements consistently as specified
Documentation	Material and inspection documentation according to the purchase specification
Not every OD and wall combination is available in every grade, condition or tolerance class. Final feasibility is confirmed against the complete purchase specification.

Chemical composition                                                 % by mass
Grade Designation	Carbon	Manganese	Phosphorus max	Sulfur  max	Silicon	Chromium	Molybdenum
1020	0.18–0.23	0.30–0.60	0.040	0.050	--	--	--
1035	0.32–0.38	0.60–0.90	0.040	0.050	--	--	--
1045	0.43–0.50	0.60–0.90	0.040	0.050	--	--	--
4130	0.28–0.33	0.40–0.60	0.040	0.040	0.15–0.35	0.80–1.10	0.15–0.25
4140	0.38–0.43	0.75–1.00	0.040	0.040	0.15–0.35	0.80–1.10	0.15–0.25
Mechanical properties at room temperature
Steel grade		Minimum values for the delivery condition
		Ultimate    Strength		Yield   Strength		Elongation  in 2 in. or  50 mm, %	Rockwell,  Hardness  B Scale
Grade Designation	Condition	ksi	MPa	ksi	MPa
1020	HR	50	345	32	221	25	55
	CW	70	483	60	414	5	75
	SR	65	448	50	345	10	72
	A	48	331	28	193	30	50
	N	55	379	34	234	22	60
1035	HR	65	448	40	276	20	72
	CW	85	586	75	517	5	88
	SR	75	517	65	448	8	80
	A	60	414	33	228	25	67
	N	65	448	40	276	20	72
1045	HR	75	517	45	310	15	80
	CW	90	621	80	552	5	90
	SR	80	552	70	483	8	85
	A	65	448	35	241	20	72
	N	75	517	48	331	15	80
4130	HR	90	621	70	483	20	89
	SR	105	724	85	586	10	95
	A	75	517	55	379	30	81
	N	90	621	60	414	20	89
4140	HR	120	855	90	621	15	100
	SR	120	855	100	689	10	100
	A	80	552	60	414	25	85
	N	120	855	90	621	20	100

Applications

Mechanical Tubing for Machined and Fabricated Components

≡ 01     Bushings and Sleeves                                  Cut rings and machined tubular parts

≡ 02     Hollow Shafts                                                 Weight-efficient rotating or supporting components

≡ 03     Spacers and Collars                                      Repeatable cut and machined dimensions

≡ 04     Hydraulic Components                                 Tube blanks for cylinders and fluid-power parts

≡ 05     Chassis Components                                    4130 and other grade directions for vehicle structures

≡ 06     Roll Cage Tubing                                            Drawing-based motorsport tube enquiries

≡ 07     Machine Assemblies                                     Pins, rollers, supports and structural members

≡ 08     Custom Tube Parts                                       CNC-finished components from seamless tube

Convert Mechanical Tube Into a Production-Ready Blank

Secondary operations can reduce buyer-side handling when the drawing and inspection basis are supplied.

Precision Cutting and Chamfering:

Fixed and cut-to-length supply

CNC Machining  :

Turning , Milling and Drilling

Honing and Skived & Roller Burnished   :

Precision internal surface

Custom Machining:

Components according to drawings

INSPECTION AND TRACEABILITY

Keep Grade, Heat and Finished Tube Traceable

≡ Material identity                                ≡ Chemical composition

≡ Tensile properties                             ≡  Hardness where ordered

≡ OD / ID / wall                                     ≡   Roundness

≡ Straightness                                      ≡  Surface inspection

≡ Roughness if ordered                      ≡  NDT if ordered

Global Precision Steel Tube Standards and  Product Network

Each page answers a different market and purchasing intent while sharing one precision-tube manufacturing framework.

Different standards define different scopes, grades, manufacturing routes and acceptance rules. Similar grade names or historical references must not be treated as automatic equivalents.The finished store structure can connect standard pages to processing and application products.

ASTM A519 Seamless Mechanical Steel Tube Purchasing Questions

Q: Does ASTM A519 include both carbon and alloy steel?

A:  Yes. It covers multiple carbon and alloy steel grades. The exact grade and condition must be stated on the order.

Q: Is ASTM A519 only cold-drawn tube?

A:  No. The standard covers hot-finished and cold-finished seamless mechanical tubing. This factory page focuses on cold-finished round tube.

Q: What is the confirmed factory size range?

A:  The confirmed range is 15-70 mm outside diameter and 1-14 mm wall thickness. Each grade and size combination remains subject to review.

Q: Can 4130 or 4140 tube be welded?

A:  Welding feasibility depends on grade, condition, wall thickness, joint design, procedure and service duty. These details should be reviewed before ordering.

Q: Can you machine sleeves and hollow shafts?

A:  Cutting, chamfering, drilling, threading and CNC turning can be reviewed from the finished-part drawing.

Q: What information is needed for quotation?

A:  Provide the ASTM edition, grade, OD, ID or wall, length, condition, quantity, tolerances, tests and intended component.