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SK series

Product catalog summary

Overview: The document provides technical specifications and guidelines for SK and SKM hydraulic cylinders, adhering to ISO 6020-1 standards. It covers working pressure, construction, mounting styles, and selection criteria.

Specifications:

Nominal Pressure: 160 bar, with an option for 210 bar.
Static Proof Pressure: 240 bar, with an option for 315 bar.
Construction Type: Bolted.
Bore Diameter Range: 25 to 320 mm.
Rod Diameter Range: 14 to 220 mm.
Mounting Styles: 8 different types.
Fluid: Mineral oil according to DIN 51524.
Temperature Range: -20 to 80 ºC.
Viscosity Range: 20 to 80.10-6 m2/s.
Max Piston Speed: 0.5 m/s.
Seals Type: According to ISO.
Cleanliness: Min class 19 / 15 - ISO 4406 (ß10≥75).
Ports: According to ISO 1179-1.

Selection Criteria: Key factors include required force, working pressure, cylinder stroke, maximum piston speed, fluid medium, temperature range for seals, mounting style, cylinder bore, rod diameter for buckling resistance, and seal compatibility.

Type SKM (210 bar): Designed for 160 bar but can operate at 210 bar with appropriate material selection. Consultation with the manufacturer is advised for high-pressure applications.

Additional Features: Options include cushioning, air bleeds, double rod models, water service, filtration, proximity sensors, position and velocity transducers, and various accessories.

Mounting Classes: Discusses the impact of cylinder mounting on maximum stroke for thrust loads, emphasizing alignment and piston rod connection. Centreline mounts are preferred to avoid issues like cylinder sway.

Tolerances: Stroke length tolerances range from 0 to +2 mm for strokes up to 1250 mm, adhering to ISO 8135:1998.

Rod Buckling: Outlines the importance of verifying buckling length for cylinders under compression using Euler's formula, incorporating a safety factor of 3.5.

Cushioning Capacity: For piston velocities over 6 m/min, cushioning at stroke ends is recommended to extend cylinder life and reduce shocks.

Additional Information: Includes tables and charts for mounting dimensions, stroke tolerances, buckling calculations, and cushioning capacities. Emphasizes consulting the factory for specific cases.

Procedures: Outlines procedures for using cylinders with rotating unions and drainage systems, including guidelines for installing a gland drain port.

Standards and Recommendations: Accessories comply with ISO 8132 standards. Recommendations include using drainage connections for long stroke cylinders and stop tubes to maintain pressure levels.

Accessories and Components: Lists various accessories with specifications for nominal pressure and mass, including rod clevis, clevis brackets, rod flanges, and spherical eyes.

Water Service: Cylinders can be customized for water as the fluid medium, including maximum operating pressure, load, and speed conditions.

Double Rod Models: Available for various mounting styles, requiring dimensioning based on single rod models.

Ports and Piston Rod Speed: Features standard BSP threaded ports, with options for larger or additional ports for higher speeds.

Spare Parts and Seals: Provides a detailed parts list, including seals categorized by type with specifications for velocity, temperature range, fluid compatibility, and materials.

Proximity Sensors: Can be integrated for position control, offering various output options.

Position and Velocity Transducers: Discusses potentiometer and magnetostrictive transducers for precise control, with specifications for resolution, linearity, and repeatability.

Catalog excerpts

Stem Cilindros Hidrulicos Hydraulic Cylinders Zilindro Hidraulikoak hdr⮢ulica, s.a. ISO 6020-1 SK Presin de Trabajo: 160 bar Working Pressure: 160 bar SKM Presin de Trabajo: 210 bar Working Pressure: 210 bar

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SK / SKM 4* 6020-1 Stern SK/SKM - PROGRAMA STANDARD SK/SKM - STANDARD PROGRAMME Dimensiones de intercambiabilidad de cilindros conforme a ISO 6020-1, Transmisiones hidrulicas, dimensiones de cilindros de simple v⭢stago - serie 160 bar - Parte 2: Serie intermedia. El tipo SKM se puede utilizar hasta presiones de trabajo de 210 bar dependiendo de la puntera del v͢stago y condiciones de trabajo. Interchangeable cylinder mounting dimensions selected in accordance with ISO 6020-1, Hydraulic fluid power single rod cylinder mounting dimensions - 160 bar series - Part 2: Medium series. SKM type can be...

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SK / SKM 4* 6020-1 Stern TIPO SKM (210 bar) TYPE SKM (210 bar) El tipo SKM esta disenado de acuerdo a la norma ISO 6020-1 serie 160 bar. Como consecuencia de la seleccin de materiales y dependiendo de la aplicacin, asf como de la elecci䴴n del vastago y conexin del vastago, se puede utili-zar para presiones mas elevadas; como resultado, la mayorfa de estos cilindros pueden trabajar a 210 bar. De todas formas, hay que tener tambin en cuenta la ten䩭sion por fatiga, que podrfa limitar la presin de trabajo del cilindro. Consultar a fabrica en estos casos. SKM type cylinder's are designed according...

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SK / SKM 4* 6020-1 Stern CLASES DE MONTAJE MOUNTING CLASSES El tipo de montaje de un cilindro afecta directamente a la carrera mxima admisible en cargas a compresion, pero ade-ms hay que tener en cuenta aspectos como tipo de amarre a la punta de v⢢stago y posibles desalineamientos, que deter-minan tambin dicho montaje. Los tipos de montaje pueden clasificarse de la siguiente forma: A cylinder's mounting affects directly to the maximum stroke at which the cylinder can be used for thrust loads, but there are factors like piston rod connection and misalignments that should also be considered. Mounting...

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SK/SKM Stem hidrulica, s.a. 6020-1 CAPACIDAD DE AMORTIGUACION Con velocidades de piston superiores a 6 m/min o bien grandes masas a mover, se recomienda disponer de amortiguacion en los finales de carrera. Ello alarga la vida del cilindro y evita golpes indeseables. La amortiguacion se consigue b⭢sicamente estrangulando la salida final de aceite, con lo que se produce una contra-presion que acta en sentido contrario al movimiento. Para evitar puntas peligrosas de presion, se ha dispuesto una amortiguacion gradual consiguiendo con ello que la con-trapresion se mantenga constante durante el recorrido...

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SK / SKM 6020-1 Stern NOMENCLATURA NOMENCLATURE E (Joule) Energfa a absorber. Para valores mximos ver grficas. m (Kg) Masa de inercia total, incluidos piston y v⢢stago. Para valores de masas de piston y vstago ver tabla. v (m/s) Velocidad de trabajo. g (m/s2 ) Aceleracion debida a la gravedad: 9,81 la (mm) Longitud de amortiguacion. Para valores ver tabla siguiente. E (Joule) Energy to be absorbed; for maximum values see chart. m (Kg) Total mass inertia, included piston and rod. For piston and rod masses values see next table. v (m/s) Working velocity. g (m/s2 ) Acceleration due to gravity: 9,81....

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MF1 58 77 + carrera / stroke MF2 58 77 + carrera / stroke ,16 -3- o s in en m 13 Stem ni 12 SK/SKM 6020-1 3 ,12 60 - EE 158 + carrera / stroke 162 + carrera / stroke MF3 58 77 + carrera / stroke EE 6,6 1 MF4 58 77 + carrera / stroke , 16 m 13 -e Le 12 3 12 162 + carrera / stroke 158 + carrera / stroke MP3 EE 58 77 + carrera / stroke 20^ ^ 13 [4 178 + carrera / stroke MP5 77 + carrera / stroke 20 ^ 10,6 58 13 SK25 20 Presin Nominal Nominal Pressure 160 bar Presin de prueba est䴩tica Static proof Pressure 240 bar Dimetro Pistn Cylinder Bore 25 mm Secci鴴n Pistn Piston Area 4,9 cm2 Dimetro V䩩stago...

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MF1 64 89 + carrera / stroke 35,2 I*3 » r-0 9 H13 64 MF2 89 + carrera / stroke ,16 m 13 Stem ni -3- in o 16 SK/SKM 6020-1 3 16 70 - EE 178 + carrera / stroke 186 + carrera / stroke MF3 64 89 + carrera / stroke EE 9 H13 64 MF4 89 + carrera / stroke , 16 m 13 -e Le s 3 16 186 + carrera / stroke 16 178 + carrera / stroke MP3 EE 64 89 + carrera / stroke 28^ ^ 13 [4 206 + carrera / stroke MP5 64 14 89 + carrera / stroke 28 ^ 13 SK32 25 Presin Nominal Nominal Pressure 160 bar Presin de prueba est䴩tica Static proof Pressure 240 bar Dimetro Pistn Cylinder Bore 32 mm Secci鴴n Pistn Piston Area 8,0 cm2...

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MF1 71 97 + carrera / stroke 40,6 1*3 »/~0 9 H13 MF2 71 97 + carrera / stroke ,16 -3- O S in m 13 Stem ni O) 16 SK / SKM 6020-1 3 16 80 - EE 206 + carrera / stroke 198 + carrera / stroke MF3 71 97 + carrera / stroke EE 9 H13 MF4 71 97 + carrera / stroke , 16 m 13 s 3 16 206 + carrera / stroke 16 198 + carrera / stroke MP3 EE 71 97 + carrera / stroke 35^ ^ 13 \4 231 + carrera / stroke MP5 71 97 + carrera / stroke 35 ^ 18 13 SK 40 Presin Nominal Nominal Pressure 160 bar Presin de prueba est䴩tica Static proof Pressure 240 bar Dimetro Pistn Cylinder Bore 40 mm Secci鴴n Pistn Piston Area 12,6 cm2 Dimetro...

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MF1 72 111 + carrera / stroke 48,2 s13 » /-0 11 H13 72 MF2 111 + carrera / stroke ,18 m 14 Stem ni -30-1 20 SK / SKM 6020-1 4 ,20 100 - EE 213 + carrera / stroke 225 + carrera / stroke MF3 72 111 + carrera / stroke EE 11 H13 MF4 72 111 + carrera / stroke , 18 m 14 -e Le 20 4 20 225 + carrera / stroke 213 + carrera / stroke MP3 EE 72 111 + carrera / stroke 44^ ^ 14 257 + carrera / stroke MP5 111 + carrera / stroke 44 ^ 22 72 14 4° S 4° O SK 50 Presiʹn Nominal Nominal Pressure 160 bar Presin de prueba esttica Static proof Pressure 240 bar Di䩩metro Pistn Cylinder Bore 50 mm Seccin Pist䴴n Piston...

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MF1 82 117 + carrera / stroke 82 MF2 117 + carrera / stroke , 20 55,5 jsi3 0 13,5 H13 m 16 Stem ni -3- o l o en 25 SK / SKM 6020-1 4 ,25 120 - EE 234 + carrera / stroke 249 + carrera / stroke MF3 82 117 + carrera / stroke EE_ 13,5H MF4 82 117 + carrera / stroke 120 s. m 16 249 + carrera / stroke 25 4 25 234 + carrera / stroke MP3 EE 82 117 + carrera / stroke 55^ ^ 16 \4 289 + carrera / stroke MP5 82 117 + carrera / stroke 55 ^ 27 16 SK 63 PresiĴn Nominal Nominal Pressure 160 bar Presin de prueba esttica Static proof Pressure 240 bar Di䩩metro Pistn Cylinder Bore 63 mm Seccin Pist䴴n Piston Area...

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