Hydraulic & Pneumatic Cylinders
Machined and honed cylinders assembled with seals fitted and function tested.
Cylinders where the bore finish and the rod chrome are the life of the part. Tubes are honed after welding, rods are ground and chrome plated, and each unit is stroked under pressure.
5–8 weeks
5 pieces
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bore range | Ø20–Ø400 | mm |
| Bore roughness | Ra 0.2–0.4 | µm |
| Rod runout | 0.05 | mm / m |
| Test pressure | 1.5× working | per unit |
| Rod finish | Hard chrome 20–30 | µm |
| Stroke tolerance | ±0.5 | mm |
Available Materials
- Steel 1045 (tubes)
- Stainless 316L
- Hard chrome plated rod (C45 / 4140)
- NBR / PU / PTFE seals
Typical Applications
- Machine actuators
- Press cylinders
- Agricultural implements
- Marine steering
- Test rig actuators
Surface Finishes
- Honed bore
- Chrome plated rod
- Painted body
- Passivate
- Lubricated and sealed
Industries Served
- Hydraulics & Pneumatics
- Agricultural Machinery
- Marine
- Industrial Equipment
- Mining & Construction
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Stroke tolerance at ±0.5 mm is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Bore range at Ø20–Ø400 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Material
- The first material listed, Carbon Steel 1045 (C45), rates 6/10 on our machinability scale at 179 HB (as-rolled) · 45–55 HRC hardened. On this shop's scale a harder alloy means slower passes and more tool changes, and that is cycle time the quote has to carry.
- Order size
- Minimum order is 5 pieces, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
- Bore gauges and an optical comparator for hole position and edge form
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why hone the bore after welding the port boss?
- Because welding distorts the tube, and the seal runs on that surface. Hone it afterwards and the seal has a round bore to follow instead of a distorted one.
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