Honed Tube

 

Cold-Drawn Seamless Honed Tube

Produced from seamless mechanical or precision tubing followed by cold drawing, heat treatment where required, straightening and internal honing. It is commonly selected when buyers require a seamless barrel, controlled dimensions and flexibility for custom quantities or bore finishes.

Typical material options include E235, E355, MT1020, 1026, 1035, 1045, 4130 and 4140.

Skived and Roller-Burnished Tube — SRB Tube

SRB processing combines internal skiving with roller burnishing. Skiving establishes the required bore dimension and form, while roller burnishing plastically smooths the surface peaks.

SRB is often selected for repetitive OEM cylinder production where production efficiency and a consistent plateau-type surface are important. The required surface profile must still be matched to the seal system and application.

Welded Cold-Drawn / DOM Cylinder Tube

A welded tube is cold drawn over a mandrel to improve dimensional accuracy, concentricity and surface consistency. It can then be honed or SRB finished.

DOM cylinder tubing can provide a cost-effective option for suitable hydraulic and pneumatic applications, but weld integrity, ovality, wall variation and the governing product standard must be agreed before ordering.

Ready-to-Hone Tube

Ready-to-hone tubing is supplied with machining allowance on the inner diameter so the customer can perform final honing after cutting, welding or other fabrication.

Choose this option when:

The final bore must be finished after barrel fabrication

Your factory controls its own seal-specific surface profile

A non-standard final ID is required

Repair or reconditioning work needs additional bore allowance

Bored and Honed Heavy-Wall Tube

Hot-finished or heavy-wall seamless tube can be bored and honed when the required wall section or diameter is outside the practical cold-drawn range. Availability, concentricity, machining allowance and final tolerance must be reviewed against the drawing.

 

ASTM A519 Hydraulic Cylinder Tube — seamless carbon and alloy mechanical tubing with honed or SRB options

EN 10305-1 E355 Honed Seamless Steel Tube — high-strength precision cylinder tube

DIN 2391 ST52 Honed Seamless Steel Tube — legacy ST52 purchasing requirements

ASTM A519 4130 Honed Tube — chromium-molybdenum alloy option

ASTM A519 4140 Honed Tube — higher-strength alloy cylinder tubing

ISO H8 Tolerance Cylinder Tubes — precision bore tolerance selection

H9 ISO Tolerance Cylinder Tubes — economical bore tolerance option

JIS G 3473 Hydraulic Cylinder Tube — carbon steel tubes specified for cylinder barrels

 

Parameter	General Quotation Range	Ordering Requirement
Base-tube construction	Cold-drawn seamless, welded cold-drawn/DOM, hot-finished bored tube	State whether a seamless construction is mandatory
Bore processing	Honed, skived and roller burnished, ready to hone	Specify finished or machining-allowance bore
Standards	ASTM A519/A519M, EN 10305-1, EN 10305-2, JIS G 3473, legacy DIN 2391 and drawing-based requirements	State standard edition and any supplementary requirements
Carbon steel grades	E215, E235, E255, E355, MT1020, 1020, 1026, 1035, 1045	Confirm grade and delivery condition
Alloy steel grades	25CrMo4, 42CrMo4, 4130, 4140	Mechanical properties must be tied to heat-treatment condition
Legacy grades	ST35, ST45, ST52	Do not substitute with a modern grade without technical review
Finished ID	Approximately 5–450 mm / 0.197–17.717 in	Availability depends on grade, process and tolerance
Outside diameter	Approximately 20–500 mm / 0.787–19.685 in	OD, ID and wall combination must be checked
Wall thickness	Approximately 0.5–50 mm / 0.020–1.969 in	Not every thickness is available at every diameter
Length	Cut lengths up to approximately 12,000 mm / 39.4 ft	State length tolerance and machining allowance
ID tolerance	H8 or H9; H7/H10 subject to technical review	ISO tolerance value changes with nominal bore size
Bore roughness	Common quoted range Ra 0.2–0.8 μm	Final value depends on honing/SRB process and seal design
Delivery condition	+C, +LC, +SR, +A or +N where applicable	Mechanical values must match the ordered condition
External protection	Oiled, phosphated, black or other agreed protection	Confirm storage period and destination environment
End condition	Plain, square-cut, deburred, beveled or machined	Drawing required for threads, ports or special ends
Documentation	MTC, dimensional report, roughness report, NDT or third-party inspection	State all document requirements on the RFQ and PO

The ranges above form a general quotation envelope. They must not be interpreted as confirmation that every diameter, wall, grade, process and tolerance combination is available.

 

H8 and H9 are ISO tolerance classes for the finished internal diameter. They are not steel grades, surface-roughness specifications or pressure ratings.

For an H-class hole, the lower deviation is zero and the permitted positive deviation changes with the nominal bore diameter.

Reference ISO Bore Tolerances

Nominal Finished ID	H8 Bore Tolerance	H9 Bore Tolerance
Over 18 to 30 mm	0 / +0.033 mm	0 / +0.052 mm
Over 30 to 50 mm	0 / +0.039 mm	0 / +0.062 mm
Over 50 to 80 mm	0 / +0.046 mm	0 / +0.074 mm
Over 80 to 120 mm	0 / +0.054 mm	0 / +0.087 mm
Over 120 to 180 mm	0 / +0.063 mm	0 / +0.100 mm
Over 180 to 250 mm	0 / +0.072 mm	0 / +0.115 mm
Over 250 to 315 mm	0 / +0.081 mm	0 / +0.130 mm
Over 315 to 400 mm	0 / +0.089 mm	0 / +0.140 mm

 

The governing ISO 286-2 edition and bore-size interval should be stated in the purchase order. For bores outside this table, request a size-specific tolerance confirmation.

When to Choose H8

Consider H8 when the cylinder design requires tighter bore control, reduced dimensional variation or closer control of the piston/seal assembly.

When to Choose H9

H9 can be sufficient when the seal and guide arrangement permits more clearance and procurement cost is more important than the tighter H8 tolerance.

The correct choice must come from the cylinder drawing and seal-system requirements. Selecting H8 does not compensate for incorrect roundness, taper, waviness or surface texture.

Selection Factor	Honed Bore	Skived & Roller-Burnished Bore
Processing principle	Abrasive material removal	Cutting followed by plastic smoothing
Typical surface character	Controlled cross-hatch	Smooth, plateau-type burnished surface
Bore geometry correction	Strong capability for correcting local bore geometry	Strong when the incoming tube and tooling are properly controlled
Production efficiency	Suitable for flexible quantities and finish control	Often preferred for repetitive, higher-volume production
Repair or oversize finishing	Well suited	Requires process-specific review
Surface acceptance	Ra plus cross-hatch/profile as specified	Ra plus plateau/profile parameters as specified
Best purchasing approach	Define finished ID, tolerance and surface profile	Define finished ID, tolerance, profile and incoming tube route

A visually “mirror-like” bore is not automatically the best sealing surface. A bore that is too coarse can damage seals, while a surface that is too smooth may retain insufficient lubrication. When required by the seal supplier, specify additional parameters such as Rz, Rpk, Rk, Rvk, material ratio and surface lay rather than approving the bore by Ra alone.

 

Grade Family	Procurement Characteristics	Selection Caution
E215 / E235	Lower-strength precision grades with useful forming and welding characteristics	Confirm delivery condition and required mechanical properties
MT1020 / 1020 / 1026	Common carbon mechanical-tubing grades for machining and welded cylinder fabrication	ASTM grade does not define the finished honed bore
E355 / legacy ST52 requests	Frequently shortlisted for higher-load industrial cylinder barrels	ST52 and E355 must not be treated as automatically interchangeable
C35E / 1035	Medium-carbon options offering greater strength and hardness potential	Weldability and heat treatment require additional attention
C45E / 1045	Selected where strength, wear resistance and machining performance are important	Preheat or controlled welding procedures may be necessary
25CrMo4 / 4130	Chromium-molybdenum family for fatigue-sensitive or higher-strength applications	Confirm material standard, heat treatment and weld procedure
42CrMo4 / 4140	Higher-strength alloy family for demanding mechanical loads	Properties vary substantially with quenching, tempering and section size

 

 

Similar grade names from ASTM, EN, DIN, SAE, JIS and GB systems are not automatically equivalent. Before approving a substitution, compare:

Chemical composition

Delivery condition

Tensile and yield requirements

Hardness

Impact requirements

Heat-treatment route

Weldability

Dimensional standard

Required inspection and certification

Standard	Main Scope	Honed-Tube Purchasing Note
ASTM A519/A519M	Seamless carbon and alloy steel mechanical tubing	Add the required finished ID, tolerance, roughness, straightness and honing/SRB process to the PO
EN 10305-1	Seamless cold-drawn tubes for precision applications	Specify steel grade and delivery condition such as +SR or +N
EN 10305-2	Welded cold-drawn tubes for precision applications	Confirm weld route, wall variation and bore-finishing requirements
EN 10305-4 / EN 10305-6	Tubes for hydraulic and pneumatic power systems	These standards are commonly associated with pressure-line tubing and must not automatically replace a cylinder-barrel specification
JIS G 3473	Carbon steel tubes for cylinder barrels	State the grade, dimensional class, finish and inspection requirements
DIN 2391	Legacy precision-tube requirement	Identify the exact edition and reconcile ST-grade terminology with the current purchase specification
ISO 286-2	Tolerance classes and limit deviations for holes and shafts	Use it to define the numerical H8/H9 bore limits for the relevant nominal size

 

Depending on the ordered tube construction and size, the production route may include:

Raw-material and heat-number verification

Seamless piercing or welded base-tube production

Cold drawing or drawing over mandrel

Annealing, normalizing or stress relieving

Straightening and dimensional inspection

Boring or machining allowance preparation

Precision honing or skiving and roller burnishing

Bore cleaning and surface verification

Cutting, deburring, beveling or CNC end machining

Final inspection, marking, rust protection and export packing

 

Precision honing

Skiving and roller burnishing

Deep-hole boring

Cut-to-length processing

CNC turning and end facing

Threading and special end preparation

OD grinding or agreed external finishing

Phosphating and temporary rust-preventive oil

Custom marking and packing

Drawing-based OEM processing

All special machining dimensions should be controlled by an approved drawing rather than a verbal description.

 

A reliable honed-tube inspection plan must verify the material, the tube geometry and the functional bore surface.

Inspection Area	Typical Verification
Material identity	Grade, heat number, product standard and delivery condition
Chemical and mechanical properties	MTC review and testing required by the governing standard or PO
Dimensions	Finished ID, OD, wall thickness, length and end dimensions
Bore geometry	Roundness, taper, cylindricity, local variation and straightness where specified
Surface condition	Roughness/profile measurement, visual inspection and checks for scratches, pits or chatter
Tube integrity	UT, ET or another agreed NDT method when applicable
Pressure or leak testing	Performed only when required by the applicable standard or purchase specification
Traceability	Heat/batch marking connected to inspection documents
Cleanliness	Bore cleaning, dry condition and capped ends
Independent inspection	SGS, BV, TÜV or another nominated agency can be arranged by agreement

Documents Available by Order

EN 10204 3.1 Material Test Certificate

Dimensional inspection report

Bore roughness report

Hardness or mechanical test report

NDT report where specified

Certificate of Conformity

Packing list and commercial shipping documents

Third-party inspection report when separately arranged

An EN 10204 3.1 MTC and an independent third-party inspection are different requirements. State both separately if both are required.

The finished internal surface can be damaged by moisture, contamination, impact or uncovered tube ends. Packing should therefore protect the bore as carefully as the external tube surface.

Available packing measures include:

Clean and dry internal bore

Temporary rust-preventive oil

Plastic caps or sealed tube ends

VCI or waterproof wrapping

Protective spacers between finished tubes

Steel-strapped bundles

Wooden cases or export plywood crates

External identification labels

Container bracing to reduce movement in transit

For long-term storage, humid destinations or sea transport, state the required corrosion-protection period on the RFQ.

 

Construction and Earthmoving Equipment

Cylinder barrels for excavators, loaders, bulldozers, cranes, concrete equipment and lifting systems.

Agricultural Machinery

Hydraulic cylinders used in tractors, harvesters, balers, tillage equipment and agricultural attachments.

Mining and Material Handling

Heavy-duty cylinders for mining machinery, conveyors, hydraulic supports, forklifts and bulk-handling equipment.

Industrial Machinery

Cylinder tubing for hydraulic presses, injection-molding machines, die-casting equipment, machine tools and industrial automation.

Mobile and Transportation Equipment

Dump-truck cylinders, trailer lifting systems, refuse equipment, railway maintenance machinery and other mobile hydraulic systems.

Pneumatic Equipment

Precision tubes for pneumatic actuators and industrial systems where the bore tolerance and surface finish match the selected seals and operating conditions.

 

Multi-Standard Product Selection

We support procurement across ASTM, EN, DIN legacy and JIS purchasing requirements, helping buyers compare grade, condition and processing options before ordering.

Base Tube and Bore Finish Matched Together

The quotation separates tube construction, material grade and delivery condition from the final honing or SRB requirements. This reduces the risk of receiving the correct steel grade with the wrong bore condition.

Drawing-Based Custom Processing

Cut lengths, tolerances, machining allowance, end preparation and additional fabrication can be reviewed against your drawing.

Inspection Defined Before Production

Required MTCs, dimensional reports, roughness verification, NDT and independent inspection can be incorporated into the order rather than requested after production.

Export-Oriented Packing

Finished bores can be cleaned, protected and capped before export packing to reduce corrosion and handling damage.

One Technical Contact for the Order

Xi'an Dongmeng Group Co., Ltd. coordinates specification review, quotation, processing, documentation, packing and shipment requirements through one project contact.

1. What is the difference between a honed tube and an ordinary seamless tube?

A seamless tube describes the tube’s construction. A honed tube describes the finished internal bore. A seamless tube is not cylinder-ready unless the required ID, tolerance, roughness and geometry have also been completed and inspected.

2. Are H8 and H9 surface-finish grades?

No. H8 and H9 are dimensional tolerance classes. They do not define roughness, roundness, material grade or pressure capacity. The bore surface requirement must be stated separately.

3. Should I choose an H8 or H9 bore?

Choose according to the drawing, piston guidance and seal requirements. H8 provides tighter dimensional control, while H9 may reduce processing cost when the design permits a wider bore tolerance.

4. Is honed tube better than SRB tube?

Neither process is universally better. Honing offers flexible geometry correction and a controlled cross-hatched surface. SRB is attractive for efficient OEM production and a smooth plateau-type finish. The seal system and required surface profile should determine the selection.

5. Can E355 replace ST52?

Do not approve the substitution by name alone. ST52 is commonly used in legacy specifications, while E355 appears in current EN precision-tube purchasing. The chemistry, mechanical properties, delivery condition, dimensions and inspection requirements must be compared.

6. Is ASTM A519 a hydraulic pressure-pipe standard?

ASTM A519 is a mechanical-tubing specification. It can provide suitable base material for hydraulic cylinder barrels, but it does not independently define a finished honed bore or establish the safe working pressure of a completed cylinder.

7. Can you supply 4130 or 4140 honed cylinder tubes?

These grades can be reviewed for higher-strength cylinder applications. Please provide the required material standard, heat-treatment condition, mechanical properties, dimensions, welding requirements and inspection plan.

8. What bore roughness should I specify?

The correct value depends on the seal material, lubrication, speed, pressure and surface-profile requirement. Ra 0.2–0.8 μm is a common quotation range across different honed and SRB products, but the drawing or seal supplier’s specification should govern.

9. Can you supply custom IDs and cut lengths?

Custom dimensions and cut lengths can be reviewed. Include the finished ID, OD or wall thickness, length tolerance, bore tolerance, machining allowance and order quantity.

10. Which inspections can be provided?

Depending on the governing standard and purchase order, inspection can include MTC review, dimensional measurement, roughness testing, hardness testing, UT/ET and independent third-party inspection.

11. What information affects honed tube pricing?

Price is mainly affected by grade, seamless or welded construction, finished ID and OD, wall thickness, tolerance class, surface profile, length, order quantity, machining, testing, documentation and packing.

12. What are the MOQ and production time?

MOQ and production time depend on whether the requested size is available from existing base-tube production, the selected grade, tooling, honing or SRB process, testing and quantity. They should be confirmed after technical review rather than stated as one universal value.

13. How should honed tubes be packed for sea shipment?

The bore should be cleaned, protected against corrosion, capped and isolated from contamination. Waterproof or VCI wrapping, strapped bundles, cases and container bracing can be selected according to the destination and storage period.

14. What should I include in an RFQ?

Send the standard and edition, grade, delivery condition, seamless or welded construction, bore process, ID, OD or wall, tolerance, roughness/profile, length, quantity, end processing, inspection documents, packing and destination.

 

For a faster technical review, copy and complete the following RFQ format:

Standard and edition:

Steel grade:

Delivery condition:

Seamless / welded / DOM:

Honed / SRB / ready to hone:

Finished ID:

OD or wall thickness:

ID tolerance:

Surface roughness/profile:

Length and length tolerance:

End preparation or machining:

Quantity:

Inspection and document requirements:

Packing requirement:

Destination port:

Application and working conditions:

Drawing attachment:

 

 

Phone: +86 157 6921 4734
Email: office@dongmjd.com
WhatsApp: Dong: +86 157 6921 4734
Office: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province

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Xi'an Dongmeng Group Co., Ltd. is one of the leading honed tube manufacturers and suppliers in China. We warmly welcome you to buy or wholesale cheap honed tube in stock here from our factory. All customized products are with high quality and competitive price. For free sample, contact us now.

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