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Fabricated from 16Mn ST52 E355 4140 42CrMo 1045. Every batch is mechanically inspected for heavy-duty hydraulic working, supplied with EN 10204 3.1 material test certificates.
Tolerance Accurate internal machining maintains ISO H8 H9 tolerance along full tube length. It avoids hydraulic oil leakage and fits standard global piston seals for cylinder assembly.
Honing and skived roller burnishing delivers mirror inner bore of Ra 0.2-0.4 µm. Low-friction bore lessens seal wear during reciprocating motion and prolongs cylinder service life.
(SRB) Deep-hole boring plus SRB process produces heavy-wall large-size cylinder tubes. Bore straightness reaches ≤0.5/1000 mm with minimized residual stress and no inner defects.
Custom Machining Compliant with DIN 2391 EN 10305-1 ASTM A519 GB/T 8713. Custom services cover fixed-length cutting chamfering threading and export anti-rust packaging for OEM ODM orders.
We support custom cylinder tubes with non-standard inner diameter, outer diameter and length, processed strictly according to drawings and technical parameters.
Processed by professional honing machines, the inner surface finish and straightness tolerance meet international high-precision standards.
All cylinder tubes have passed SGS, CE and RoHS certifications. We hold complete import and export qualifications for global shipment.
We can provide material certificates, factory test reports and third-party inspection certificates to support customer verification.
We adopt standard export wooden cases with rust-proof packaging to avoid rust, deformation and collision damage during transportation.
Standard sizes are in sufficient stock and can be shipped within 3-7 days; lead time for customized products is negotiable.
