Standard production at Soydan Hidrolik covers bores of Ø25–400 mm, rods of Ø16–280 mm and strokes to 4,000 mm. Beyond that, we design and build project cylinders at our İzmir works to Ø1,000 mm bore, Ø700 mm rod, 12 m stroke and 400 bar. Welding is carried out under EN ISO 3834-2 with NDT of welds; every cylinder is pressure tested to ISO 10100.
These are ceilings; each combination of bore, stroke and pressure is verified by calculation. Above the standard range every cylinder is a project: buckling and strength calculations, weld joint design and a test plan are completed before manufacture, and 2D/3D drawings go to you for approval. The welded HYC-W family is the basis; ISO 6022 round-flange (HYC-F) and mill-type (HYC-M) constructions are also built as projects. For the build-to-drawing process, see custom hydraulic cylinders.
A mistake on a large bore cylinder is hard to put right, so every stage is documented: material certificates (3.1 to EN 10204 on request), welding procedure specification (WPS), NDT report, buckling calculation and the signed, serialised ISO 10100 test report. The works is certified to ISO 9001, ISO 14001 and ISO 45001 (see downloads). Cylinders we manufacture carry a 12-month warranty from invoice date against defects in material, workmanship and design, under the terms of sale.
The same works builds series cylinders for European OEMs and exports to Germany, Austria and the United Kingdom; our cylinders are also distributed in Europe through Wessel-Hydraulik. Large bore projects run through the same quality system and test procedure. European accounts are handled from our London office, and factory audits in İzmir are welcome by appointment (contact). See also choosing a hydraulic cylinder manufacturer.
Each step produces a document; manufacture starts only after you approve the drawing.
For price factors see hydraulic cylinder cost; for press duty, hydraulic press cylinders.
Illustrative scenario, typical values: a steel plant cylinder with Ø630 mm bore, Ø360 mm rod, 6,000 mm stroke and 250 bar, mounted horizontally in a hot environment. Buckling comes first: a rod that fails the check when pivot-mounted at both ends may pass with a flange mounting and a guided load. The rod, roughly 5 tonnes, sags under its own weight, so guide rings are widened, a stop tube is added and, if necessary, the body is given an intermediate support.
With Ø360 mm confirmed, weld joint design and any post-weld stress relief follow, then sealing: an FKM- and PTFE-based seal set for the heat and a wiper with a metal scraper against scale. Testing to ISO 10100 is at 250 bar and at 1.5 times that, 375 bar. Dispatch needs a lifting plan for the weight and the closed length of over 7 m. This scenario is illustrative, not an actual customer project; for yours, use the quote form.
On a project basis: Ø1,000 mm bore, Ø700 mm rod, 12,000 mm stroke and 400 bar working pressure. Standard production runs to Ø400 mm bore and 4,000 mm stroke; anything larger is designed as a project and quoted separately.
Custom cylinders ship ex-works in under 10 weeks from drawing approval. On large bore projects, procurement of honed tube and large-diameter rod material, stress relief and NDT can extend this; the quotation states the project lead time and critical material lead times.
Yes. Send the dimensions, any drawing (PDF, DWG or STEP) and the operating conditions. We reverse-engineer the design, propose improvements where needed (sealing, bearing arrangement, rod coating) and manufacture after you approve the drawing.
The signed, serialised ISO 10100 test report comes with the engineering file. EN 10204 3.1 material certificates and NDT reports are added on request; the pressure test can be witnessed as a factory acceptance test (FAT).
Cylinders ship in ISPM-15 heat-treated crates. We organise freight on request; the Incoterm is agreed per order. Installation and commissioning support by our own teams can be quoted on request.
Send the duty data and any drawings in PDF, DWG or STEP. We reply within 48 hours with an application data sheet.
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