LOGO CMI - Costruzioni Meccaniche IndustrialiCostruzioni Meccaniche Industriali


Hydraulic cylinders

General characteristics

  • Operating pressure up to 210 Bar (21MPa)
  • Actuating speed up to 15 m/sec
  • Operating temperatures from -20°C to +150°C
  • High quality of materials and seals
  • Available in single and double-stem version
  • Strict concentricity and straightness standards
  • Strict surface finish standards
  • Accurate assembly and strict final tests
  • Flexibility to adapt to various needs

Building characteristics

  • Tie-rods in high-resistance tempered steel
  • High-quality sleeve entirely micro-finished
  • Steel stem C45 with chrome appliqué
  • Optional, chromed steel stem 42CrMo4
  • Optional, chromed and tempered steel stem
  • Optional, stem in stainless steel
  • Optional, stem in ground, nitrided steel 41CrAlMo4
  • Threaded, monoblock, self-locking piston
  • Polyurethane, Viton and PTFE seals

Dimensional characteristics

  • 15 different standard anchoring types
  • Up to 3 stem sizes for boring
  • Up to 3 male threads for boring
  • Up to 3 female threads for boring

Reference standards:

  • ISO 6020/2 (1991)
  • DIN 24554

Type of admissible fluid

  • Mineral oil
  • Special fluids upon request

Tie-rod hydraulic cylinders, ISO 6020/2 series

For general uses with operating pressures up to 160 bar

Intended for a wide range of industrial applications, the tie-rod standard cylinders are designed and built to satisfy the most demanding operating conditions, with durable and efficient performances, minimum maintenance and utmost output. Thanks to the attention paid to the design and choice of materials and seals used, construction with high quality and accuracy standards, combined to a severe final test that reproduces the typical operating conditions of the cylinder, these hydraulic actuators are a valid choice for any type of application where utmost reliability, repeatability and high dynamic characteristics are required.

CMI provides its technical and design staff for special executions according to specific requirements. Special anchoring, non-standard boring or stem sizes, alternative sealing systems and non-standard options, such as control (servo-cylinders) and sealing modules (safety solutions in compliance with the machine Directive) installed directly on the actuator, are only some of the customisation options offered by our company.

General characteristics

The building components are assembled by means of tie-rods in high-resistance tempered steel, the sleeve inside of which the piston slides, is entirely polished in order to minimize friction coefficients, reducing the seals wear and maximizing the sealing performances.

The stem is made in steel C45 with chrome appliqué or, upon request, in chromed steel 42CrMo4, tempered and chromed steel, stainless steel or ground, nitrided steel 41CrAlMo4.

Guide components are made in bronze and the piston is secured to the stem by means of a thread with adhesive finish, and locked by means of a safety dowel.

Sealing components

Particular focus is paid to sealing components, all the employed seals are of prime quality and optimised in order to minimize fluid leakage, maximizing static sealing, without compromising the overall performances and dynamics of the actuator.

The various combinations include seals in polyurethane, PTFE and VITON + PTFE.

Ad-hoc sealing solutions can be studied upon request, for particular actuating needs of the customer..

Dimensional inter-exchangeability

Cylinders comply with ISO 6020/2 (1991) and DIN 24554 standard, therefore they can be inter-exchanged with reference standard cylinders.

They can be designed and built upon request, to respond to the customer’s specific dimensional needs..

Size range
  • Boring from Ø25mm to Ø200mm
  • Stem from Ø12mm to Ø140mm
  • Available with any practical operating travel.

Fifteen different types of standard anchoring, up to three stem sizes and male or female threads according to boring size.

Intermediate anchoring and edge supports for cylinders with fixed type assembly and travel exceeding 1000 mm, supports for tie-rods, travel stops.

Connection inlets

Standard BSPP connection inlets with support surface, without spot faced surface.
Possibility to manufacture non-standard connection inlets based on the customer’s needs.
Four possible alternative positions for supply inlets, also applicable to air exhaust vents and damper adjustments.

Operating limits
  • Nominal operating pressure (constant operation): 160 Bar (16MPa).
  • Nominal operating pressure (intermittent operation): 210 Bar (21MPa).
  • Actuating speed up to 0.5 m/sec with standard seals, 15 m/sec with PTFE seals.
  • Operating temperature: from -20°C to +150°C according to the fluid and type of seals used

Optional characteristics

  • The cylinders of this series can be of single-actuating use in case of withdrawal or removal by means of external force or spring return.
  • They are supplied with internal spring for piston return.
  • They are fitted with air bleed muffler for dry chamber.
  • Adjustable front and rear limit switch decelerators.
  • Front and rear exhaust vents to eliminate air from the actuator
  • Useful when the fluid must not adhere to the stem, it provides a connection inlet on the bush-holder flange, to connect to the system tank.
  • Intermediate anchoring and edge supports for long travels
  • Supports for anti-vibration and anti-extension tie-rods
  • Limit switch pipes for non-guided load applications
  • Travel regulators and various adjustable stop systems
  • Proximity sensors installed inside heads to detect a reliable end-stop signal
  • Linear position transducers to constantly detect the stem position
  • Various internal and external systems are available to prevent the stem from rotating during its operating travel.
  • To control the moving component in terms of direction, force and speed or a combination of these parameters. Control can be in open or close loop with position and/or pressure transducer.
  • To maintain the position and anti-burst safety, pipes are available with flexible assembly, piloting and operating options, featuring more parallel cylinders (two or three-cylinder assemblies).

Standard designs for tie-rod hydraulic cylinders, ISO 6020/2 series

Range of tie-rod hydraulic cylinders, ISO 6020/2 series

Series of cylinders compliant with ISO 6020/2 standard Cylinder ISO 6020/2 bore Ø63 stem Ø28 ME5 design Series of cylinders ISO 6020/2 with external thermal treatment for corrosive environments Cylinder ISO 6020/2 bore Ø25 stem Ø18 MT1 design Cylinder ISO 6020/2 bore Ø63 stem Ø36 MT2 design Cylinder ISO 6020/2 bore Ø160 stem Ø110 MT4 design Cylinder ISO 6020/2 bore Ø40 stem Ø28 MP5 design Measuring cylinder bore Ø200 stem Ø90 obtained from standard cylinder ISO6020/2
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