A Honed Tube is a precision-machined seamless steel tube with a finely finished internal bore, produced through a honing or skiving & roller burnishing process.
It is primarily used in hydraulic and pneumatic cylinders, where high dimensional accuracy, smooth surface finish, and wear resistance are critical.
Typical internal surface roughness:
Ra 0.2 – 0.8 μm
Even lower Ra achievable for high-end hydraulic applications
Why Honed Tubes Are Essential in Hydraulic Systems
Honed tubes directly determine:
Seal life
Cylinder efficiency
Leakage performance
Overall system reliability
A poor-quality tube can lead to:
Seal damage
Oil leakage
Premature cylinder failure
That's why honed tubes are considered a critical functional component, not a standard steel pipe.
Manufacturing Process of Honed Tubes
1. Raw Material Selection
Seamless tubes (hot rolled or cold drawn)
High-quality carbon steel or alloy steel
2. Rough Machining
Boring or skiving to remove internal scale and irregularities
3. Honing / SRB Process
Honing: abrasive stones create cross-hatched surface
Skiving & Roller Burnishing (SRB): cutting + cold working for mirror-like finish
4. Final Inspection
ID tolerance
Straightness
Roundness
Surface roughness (Ra)
Common Honed Tube Steel Grades
Carbon Steel Grades
E355 (EN 10297-1)
ST52 / E470
SAE 1026
ASTM A106 / A53
Alloy Steel Grades
42CrMo4 / 4140
20MnV6
4130 / 4145
Stainless Steel (Special Applications)
304 / 316
17-4PH (high strength + corrosion resistance)
Honed Tube Standards & Specifications
| Standard | Grade | Application |
|---|---|---|
| EN 10297-1 | E355 | Hydraulic cylinders |
| DIN 2391 | ST52 | General mechanical |
| ASTM | SAE 1026 | Cylinder barrels |
| GB/T 3639 | 20# / 45# | China market |
| ISO | H8 / H9 ID tolerance | Precision tubes |
Key Technical Parameters Buyers Care About
Inside Diameter (ID): 40 mm – 500+ mm
Length: Random / Fixed (up to 12 m or customized)
ID Tolerance: H8 / H9
Straightness: ≤ 1/1000
Surface Roughness: Ra ≤ 0.8 μm
Roundness: ≤ 50% of ID tolerance
Honed Tube vs Cold Drawn Precision Tube
| Item | Honed Tube | Precision Tube |
|---|---|---|
| Internal Finish | Excellent (Ra ≤ 0.8) | Fair |
| ID Accuracy | Very high | Medium |
| Seal Performance | Excellent | Limited |
| Application | Hydraulic cylinders | Mechanical parts |
Typical Applications of Honed Tubes
Hydraulic cylinder barrels
Pneumatic cylinders
Heavy machinery (excavators, cranes)
Injection molding machines
Agricultural machinery
Marine & offshore equipment
Common Quality Inspection Items
Bore gauge measurement (ID)
Roughness tester (Ra)
Straightness & ovality check
Ultrasonic testing (UT)
Chemical composition & mechanical properties
Honed Tube – Frequently Asked Questions (FAQ)
1. What is a honed tube used for?
A honed tube is mainly used as a hydraulic or pneumatic cylinder barrel.
Its precisely finished internal bore ensures smooth piston movement, long seal life, and minimal leakage, making it essential in hydraulic systems.
2. What is the difference between a honed tube and a precision tube?
A precision tube may have controlled dimensions, but it does not meet the internal surface roughness and roundness required for hydraulic cylinders.
Honed tubes offer:
Lower surface roughness (Ra ≤ 0.8 μm)
Tighter ID tolerance (H8 / H9)
Better sealing and wear resistance
3. What is the standard surface roughness of a honed tube?
Typical internal surface roughness:
Ra 0.2 – 0.8 μm
Premium hydraulic applications may require Ra ≤ 0.4 μm
4. What ID tolerances are available for honed tubes?
Common tolerances include:
H8
H9
Custom tighter tolerances can be supplied upon request.
5. What steel grades are commonly used for honed tubes?
Common grades include:
Carbon Steel
E355 / ST52
SAE 1026
Alloy Steel
42CrMo4 / 4140
20MnV6
Stainless Steel (special applications)
304 / 316
6. What standards do honed tubes comply with?
Honed tubes are commonly produced according to:
EN 10297-1
DIN 2391
ASTM A106 / SAE 1026
GB/T 3639
7. What are the typical size ranges?
Inside Diameter (ID): approx. 40 mm – 500 mm (larger sizes available)
Length: Random or fixed length, up to 12 meters
Custom sizes are available upon request.
8. Honed tube or skived & roller burnished (SRB) tube – which is better?
Both are suitable for hydraulic cylinders:
Honing: better for small to medium diameters, excellent cross-hatch finish
SRB: higher efficiency for large diameters, improved fatigue strength
Selection depends on cylinder design and working conditions.
9. Can honed tubes be supplied with chrome-plated inner surfaces?
Yes. Internal hard chrome plating can be applied to honed tubes for:
Enhanced wear resistance
Improved corrosion resistance
Longer service life in harsh environments
10. What inspections are performed before delivery?
Typical inspections include:
Internal diameter measurement
Surface roughness testing (Ra)
Straightness and ovality inspection
Chemical composition analysis
Mechanical property testing
Ultrasonic testing (UT), if required
11. What are the common delivery conditions?
Honed only
Honed + stress relieved
Honed + chrome plated
Honed + phosphated / oiled
12. What is the usual lead time for honed tubes?
Standard sizes: 15–25 days
Customized sizes or large quantities: 25–40 days
Lead time may vary based on material grade and processing requirements.
13. How are honed tubes packed for export?
Standard export packing includes:
Anti-rust oil inside the bore
Plastic caps on both ends
Individual or bundled packing
Seaworthy wooden cases or steel frames
14. What information should I provide for a quotation?
To receive an accurate quotation, please provide:
Inside diameter (ID)
Outside diameter (OD) or wall thickness
Length
Steel grade
Quantity
Standard & tolerance requirements
Surface roughness requirement (Ra)
15. Can honed tubes be customized?
Yes. Honed tubes can be fully customized in terms of:
Size & tolerance
Steel grade
Surface finish
Heat treatment
Testing & inspection requirements
Contact Us
Looking for high-quality honed tubes for hydraulic or pneumatic cylinder applications?
Our technical team is ready to support your project with reliable materials, precise machining, and stable delivery.
Get a Fast & Accurate Quotation
To help us quote quickly, please include:
Inside Diameter (ID)
Outside Diameter (OD) or wall thickness
Length (random or fixed)
Steel grade & standard
Quantity
ID tolerance (H8 / H9)
Surface roughness requirement (Ra)
Application or working conditions (if available)
Why Work With Us
Stable raw material sourcing
Advanced honing & SRB processing
Strict dimensional and surface inspection
Export-standard packing & global delivery
Technical support from inquiry to shipment
📩 Send us your inquiry today - we will respond within 24 hours with a professional solution tailored to your application.
