Which hydraulic cylinders are used for mould clamping on injection moulding machines?

For mould clamping, hold-down and auxiliary movements around an injection moulding machine, tie-rod cylinders CD / DK to ISO 6020/2 with an operating pressure of 160 bar are the most common choice. Where installation space is tight, the compact RP / MP series are well suited.

Why are cylinders with ISO mountings beneficial in a plastics plant?

Standardised mounting to ISO 6020/2 guarantees dimensional interchangeability between manufacturers, so replacing or substituting a cylinder in a mould or machine is done without design changes. This significantly reduces downtime and supports multi-shift operation.

What operating pressure do cylinders for injection moulding machines have?

Tie-rod cylinders CD / DK / MD operate at 160 bar (tested at 240 bar). Compact aluminium RP / MP handle 160 bar up to Ø 63 mm and 100 bar for Ø 80–100 mm; the heavy-duty steel RQ series reaches 250 bar.

What is end-of-stroke cushioning for on injection moulding cylinders?

Hydraulic cushioning absorbs the shock at the end of the stroke during the fast, repeated cycles that are typical of plastics machinery. Cushioning can be selected at the front (V), at the rear (Z) or on both sides (K), protecting both the mechanism and the cylinder itself.

Can the cylinder be fitted with end-position sensors for cycle control?

Yes. The MD series (tie-rod) and the compact MP have a magnetic piston and sensors for detecting end positions — the signal goes straight to the PLC. The sensors are intended for end positions, not for continuous travel measurement; for continuous positioning, the TD servo cylinders are used.

Which seals should I choose for fast cycles and higher mould temperatures?

For normal operation, use the high seal S (NBR+PTFE); for fast cycles above 0.5 m/s the low-friction L seal; for higher temperatures on heated moulds the H seal (Viton up to +150 °C); and for non-flammable HFC fluids the G seal.

Which cylinders are suitable for the limited space inside a mould?

For side movements, auxiliary mechanisms and small installation dimensions directly within the mould or fixture, the compact RP / MP series are suitable. Where higher pressure is required in a compact design, the steel RQ series serves up to 250 bar.

How quickly can you deliver a custom cylinder for machine downtime?

The standard lead time is within 14 working days. In urgent cases, when production is at a standstill, manufacturing can prepare a custom ISO 6020/2 cylinder within 48 hours.

Are Conforti cylinders interchangeable with Parker, Bosch Rexroth or Festo?

Yes. Thanks to compliance with ISO 6020/2 (DIN 24554), CD / DK / MD cylinders have uniform envelope and mounting dimensions, so they replace Parker Hannifin, Bosch Rexroth, Festo and other cylinders in an existing machine without modifications.

Hydraulic cylinders for the plastics industry and injection moulding machinesISO 6020/2 (CD/DK/MD) and compact RP/MP/RQ

Double-acting hydraulic cylinders for mould clamping, injection moulding machines, part ejection and fixtures in plastics production. Tie-rod cylinders CD / DK / MD to ISO 6020/2 (160 bar, Ø 25–200 mm) and compact RP / MP / RQ series for limited space. Standardised ISO mountings ensure interchangeability and easy maintenance in multi-shift operation. The MD / MP series adds sensors for end-position detection. Supplied by hydraulika.store, an authorised distributor of Conforti Oleodinamica for the EU — with an online configurator, free CAD models and delivery within 14 working days (48 h for urgent orders).

160–250 barOperating pressure

Ø 25–200 mmBore

6 seriesCD/DK/MD · RP/MP/RQ

14 daysStandard delivery

Configure a cylinder CAD 3D models

CD / DK / MD datasheet (PDF)

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CD / DK / MD · ISO 6020/2

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RP / MP / RQ · compact

ISO 6020/2 DIN 24554 Mould clamping 160 / 250 bar

Need to monitor the piston position in the cycle? The MD series (tie-rod) and the compact MP have a magnetic piston and SH / SR / SP sensors — on the tie-rods for MD (sliding anywhere along the stroke, intermediate and end positions), in the profile slot for MP — they signal the piston position to the PLC. Suitable for controlling the injection moulding cycle and monitoring an open/closed mould. More about cylinders with position sensors →

Little space in the mould or on the fixture? The compact RP / MP series (aluminium, 160 bar) and RQ (steel, up to 250 bar) have significantly smaller installation dimensions than tie-rod cylinders — ideal for side movements, ejection and auxiliary mechanisms in limited space. View compact cylinders RP / MP / RQ →

Frequently asked questions

FAQ on cylinders for the plastics industry

Click a question — the answer appears below. Verified against the technical documentation of Conforti Oleodinamica.

Useful articles from our Technical Centre: How to choose a double-acting hydraulic cylinder — 7 steps → Interchangeability of competitor cylinders to ISO → Cylinder assembly, maintenance and service — Conforti KIT → All articles in the Technical Centre →

Online configurator

Configure your hydraulic cylinder for an injection moulding machine online

Choose the application, mounting, bore and stroke in the online configurator. It calculates the extend and retract force as well as the required oil flow, shows the 3D model and generates the cylinder configuration code (SKU) — including the tie-rod CD / DK / MD and compact RP / MP / RQ series.

Configurator not loading? Open the configurator in a new tab →

Technical specifications

Technical specifications of cylinders for injection moulding machines

CD, DK and MD cylinders for plastics operation are manufactured to ISO 6020/2 (DIN 24554). The standard guarantees interchangeability with Parker Hannifin, Bosch Rexroth, Festo and others — replacement in the machine without design changes. For compact installation, the RP / MP / RQ series serve.

Standard

ISO 6020/2 · DIN 24554

Full interchangeability with other makes

Operating pressure

160 bar (CD/DK/MD)

Compact RP/MP 100–160 bar · RQ up to 250 bar

Bore

CD: Ø 25–100 mm · DK: Ø 125–200 mm

MD: Ø 25–125 mm (with sensor)

Hydraulic medium

Mineral oil, phosphate esters, HFC

G seal required for HFC

Mounting types

14 variants — flanges, trunnions, clevises, feet…

Easy replacement in mould and machine

Seals

S (NBR+PTFE) · L (PTFE) · H (Viton) · G (HFC)

Operating temperature −20 °C to +80 °C (H up to +150 °C)

Which series for an injection moulding machine

Which series should you choose for plastics operation?

For mould clamping and the usual movements around an injection moulding machine, tie-rod cylinders CD / DK (ISO 6020/2) serve. For limited space in the mould or on the fixture, the compact RP / MP / RQ series are suitable. To monitor end positions and control the cycle, the MD series adds magnetic sensors.

CD / DK seriesISO 6020/2 Tie-rod · 160 bar (test 240) · Ø 25–200 mm. Mould clamping, injection moulding machines, ejection, fixtures and clamping. CD / DK series detail → RP / MP / RQ seriesCompact Small installation dimensions · RP/MP aluminium 100–160 bar · RQ steel up to 250 bar. Side movements, limited space in the mould. Compact cylinders detail → MD / MP seriesSensor Magnetic piston, SH / SR / SP sensors for piston position (intermediate and end) · signal to the PLC. Monitoring an open/closed mould, cycle control. Cylinders with sensors detail →

Line automation Press auxiliary motion Sheet-metal forming Load handling Lifting mechanisms Tilters and positioning

Plastics applications

Where hydraulic cylinders are used in plastics production

Mould clamping, injection moulding machines, part ejection, side movements in the mould, hydraulic clamping and automated workstations around the injection moulding machine — from ISO 6020/2 tie-rod series (CD / DK, MD with sensors) to compact cylinders for limited space (RP / MP / RQ). A direct replacement for Parker, Bosch Rexroth or Festo wherever cycle repeatability, reliability and spare-part availability are decisive.

Need help selecting a cylinder for your application?

CAD & technical documentation

CAD models and 2D drawings of cylinders for injection moulding machines

Download the 3D model or 2D drawing for your precisely configured hydraulic cylinder — tie-rod CD / DK / MD and compact RP / MP / RQ. The model matches the bore, rod, mounting (or ports) and stroke from the configurator. STEP, IGES, Parasolid, STL, DWG, DXF and PDF formats free of charge.

How to get a 3D model or drawing of a cylinder for an injection moulding machine

1
Configure the cylinder — set the bore, rod, mounting and stroke in the configurator above
2
Open the 2D / 3D model section — after adding the product to your request, the configuration code (SKU) is shown
3
Enter the configuration code (SKU) — paste the cylinder code into the "CODE WIZARD" and confirm the configuration
4
Choose a format and download — STEP, IGES, Parasolid, DWG, DXF and more

Available formats:

STEPIGESParasolidSTLDWGDXFPDF

CAD configurator and technical documentation

3D models and drawings CD / DKSTEP, IGES, Parasolid, DWG, DXF, PDF

3D models and drawings MDCylinders with position sensor — CodeWizard

CD / DK / MD catalogue (PDF)Technical drawings and dimension tables

3D models and drawings RP / MP / RQCompact cylinders — CodeWizard

RP / MP / RQ catalogue (PDF)Compact cylinders — drawings and dimensions

Position sensing

Position sensing options for hydraulic cylinders

End positions

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SPV / SPZ / SPK proximity switches →

Intermediate positions

MD hydraulic cylinder with a magnetic position switch on the tie-rod

MD cylinders with SH / SR switches →

Full stroke

Servo cylinders TD / TK →

For a comparison of all position-sensing methods, technical parameters and selection guidance, see Position sensors for hydraulic cylinders →

Brand authority

Why Conforti through hydraulika.store

We are an authorised distributor of the Italian manufacturer Conforti Oleodinamica. For the plastics industry and injection moulding machines we supply cylinders with ISO mountings for mould clamping — precise and repeatable operation. An authorised supply with full technical support.

Authorised distributor

Genuine Conforti cylinders with the full manufacturer's warranty. No re-exports or aftermarket. A direct distribution agreement.

Mould clamping on injection moulding machines

Cylinders with ISO mountings for clamping and holding moulds on injection moulding machines — a standardised envelope.

ISO 9001 since 2008

Conforti has held an ISO 9001 certified quality management system for 18+ years. Periodically validated business processes.

End-of-stroke cushioning

Adjustable end-of-stroke cushioning protects both the mould and the machine from shocks at the end of the stroke.

100% individual test

Before delivery, every cylinder goes through an individual test protocol to ISO 10100. Records are retained in the system.

Sensors for cycle control

Cylinders can be fitted with end-position sensors to control the production cycle of the press.

Made in Italy

Manufactured in Monza (Lombardy). A proven design to ISO 6020/2 and ISO 6022, DIN 24554 / 24333.

B2B pricing and EU support

Technical support and preferential pricing for manufacturers and OEMs. Consultation and an online configurator.

If you have any questions, please contact us — Adam Tomášek, sales & technical representative and authorized distributor of Italian Conforti Oleodinamica hydraulic cylinders for CZ, SK and the EU since 2023, who prepared this content for you. Contact →