Precision Tube Cluster
Skived & Roller-Burnished Tubes — finish quality and applications
A practical comparison of skiving, roller burnishing, and honing for hydraulic cylinder barrels and high-volume tube finishing.
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Skived and roller-burnished tubes are hydraulic cylinder tubes whose ID is cut to size by skiving and then smoothed/work-hardened by rollers. Compared with honing, the process can be faster and very consistent, but buyers must still specify H8/H9 bore tolerance, ISO 4287 roughness, straightness, and MTC.
When should a buyer choose skived and roller-burnished tubes instead of honed tubes?
Choose skived and roller-burnished tubes for repeatable hydraulic barrel production where speed, consistent bore geometry, and low roughness are important. Choose honing for small batches, repair barrels, difficult sizes, or when the drawing specifically requires a honed cross-hatch surface.
Skiving and roller burnishing is a two-stage ID finishing process. The skiving tool removes material to correct the bore size and geometry. Roller burnishing then plastically smooths the peaks and can improve the surface layer. The result is commonly used for hydraulic cylinder barrels where high productivity and a smooth bore are required.
Honing removes material abrasively and leaves a cross-hatch pattern familiar to many cylinder shops. It is flexible, works well for varied sizes and repair work, and is still widely accepted. Skiving and burnishing can be faster on suitable tube sizes and production runs, but it requires the right machine, tooling, and starting tube quality. It should not be treated as a cheap shortcut for poor raw tube.
Procurement should ask whether the finished bore meets the same functional requirements: ID tolerance, roughness, straightness, roundness, and cleanliness. If the drawing says honed and the supplier offers skived/roller-burnished, get engineering approval before accepting the alternative.
How does roller burnishing change surface roughness and seal performance?
Roller burnishing compresses surface peaks instead of cutting them away, producing a smooth bore that can support good seal life. It may reduce Ra significantly, but the accepted finish should be stated with ISO 4287 parameters and matched to seal recommendations.
A burnished surface often has low Ra and a compacted surface layer. For many hydraulic seals this is beneficial because the seal sees fewer abrasive peaks. However, surface function is not measured by Ra alone. Oil retention, peak height, and texture direction also matter. Some applications prefer the oil-retaining character of a honed cross-hatch; others run well on burnished bores.
ISO 4287 roughness language helps avoid subjective arguments. If the buyer needs Ra maximum, Rz range, or another parameter, write it into the RFQ. Ask for the measurement method and sampling locations for critical cylinders. A beautiful-looking bore can still be wrong if it is too polished for the seal package.
Cleanliness after skiving is essential. Chips and fines must be removed before dispatch. A capped and oiled bore protects both the finish and the dimensional investment during transport.
What starting tube quality is needed before skiving and burnishing?
Start with cold-drawn precision tube such as DIN 2391 or EN 10305 E355 in a suitable condition, often BK+S. The tube must have enough machining allowance, acceptable straightness, controlled wall variation, and no ID defects that finishing cannot remove.
Skiving and burnishing does not magically repair every defect. If the raw tube has deep laps, severe eccentricity, excessive bow, or too little wall allowance, the finished barrel may still fail inspection. Cold-drawn precision tubes are preferred because they begin closer to final geometry than hot-finished commodity tubes.
E355/ST52 BK+S is common for cylinder barrels because it provides strength and machining stability. The starting ID must allow controlled material removal to reach the final bore. If the buyer supplies a pre-existing tube for conversion, the finisher should inspect it before committing to H8 or H9.
Wall variation matters because skiving follows the bore and the final barrel still needs enough wall for pressure, ports, and end machining. For safety-critical cylinders, design calculations should use minimum wall after finishing, not nominal wall before machining.
What should be compared in a honing versus skiving quotation?
Compare finished tolerance, roughness, straightness, minimum wall, lead time, rejection risk, batch quantity, and inspection records. Skiving may quote faster on production volumes, while honing may be more flexible for mixed sizes, urgent repairs, or special surface texture.
A simple per-metre finishing rate can mislead procurement. Skiving and burnishing may reduce cycle time, especially in larger production batches. Honing may have lower setup friction for small quantities or unusual sizes. The right commercial comparison includes total lead time, scrap risk, machine availability, and whether fixed cut lengths are included.
Inspection records should be the same standard whichever process is used. Ask for finished ID readings, roughness report, visual bore check, and MTC for the parent tube. If the supplier cannot document the finished bore, the buyer has little evidence if the cylinder leaks later.
Also compare downstream machining. A more consistent bore may reduce piston fitting time and rework. A poor surface choice can increase seal warranty claims. The lowest finishing line item is not necessarily the lowest cylinder cost.
Specifications
| Tolerance class | Finished ID commonly H8 or H9 per ISO 286, depending on seal and pressure duty |
|---|---|
| OD / ID range | Hydraulic cylinder tube sizes subject to machine capacity and starting tube allowance |
| Surface finish | Skived and roller-burnished bore; specify Ra/Rz per ISO 4287 and seal recommendation |
| Starting tube | DIN 2391 / EN 10305 E355 or equivalent precision tube, often BK+S |
| Process attribute | Material removal by skiving plus surface compaction by roller burnishing |
| Documentation | Parent MTC, finished bore report, roughness report, straightness check on request |
Standards cited for Skived & Roller-Burnished Tubes
Reference standards cited on this page
- DIN 2391-1:1994 — Seamless precision steel tubes — Technical delivery conditions (Deutsches Institut für Normung)
- EN 10305-1:2016 — Steel tubes for precision applications — Seamless cold-drawn tubes (European Committee for Standardization (CEN))
- EN 10305-4:2016 — Seamless cold-drawn tubes for hydraulic and pneumatic power systems (European Committee for Standardization (CEN))
- ISO 286-1:2010 — Geometrical product specifications — ISO code system for tolerances on linear sizes (International Organization for Standardization)
- ISO 4287:1997 — Surface texture — Profile method — Terms, definitions and surface texture parameters (International Organization for Standardization)
- EN 10204:2004 — Metallic products — Types of inspection documents (European Committee for Standardization (CEN))
Related to Skived & Roller-Burnished Tubes
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