Editorial Technical Reference

Hydraulic Ram

This page explains how Hydraulic Ram is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A hydraulic actuator that converts hydraulic pressure into linear mechanical force and motion.

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Hydraulic Ram in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Hydraulic Ram

Definition
The hydraulic ram is a linear actuator used as the primary force-generating component in a metal plate bending machine. It converts pressurized hydraulic fluid into a controlled linear mechanical force that drives the bending beam or punch downward, applying the high force required to bend metal plates to a specified angle. The ram consists of a cylinder, a piston, and a piston rod, with seals preventing fluid leakage. The bore diameter determines the force output, while the stroke length defines the travel range. Operating pressure is typically 1.0–1.6 MPa, with a maximum pressure of 25 MPa to avoid permanent deformation. The operating temperature range is -20 to 80°C, beyond which seals may degrade. The piston rod diameter affects buckling strength, and the rod surface is hard chrome plated to improve wear resistance. Mounting types include flange, clevis, and foot, and port sizes range from G1/4 to G1 BSP. Cushioning is adjustable to reduce end-of-stroke impact. Seal materials include NBR, FKM, and PTFE, compatible with hydraulic fluids. Weight varies from 5 to 500 kg depending on size and mounting. All parameters are reference ranges per ISO standards (e.g., ISO 6020-2, ISO 3320, ISO 5598, ISO 1629, ISO 228-1, ISO 6158) and must be verified with the legal manufacturer or supplier for the specific model and application. The ram is a component, not a standalone machine, and its performance depends on the hydraulic system design and control valves.
Working Principle
Hydraulic fluid is pumped into the cylinder chamber, increasing pressure against the piston. This pressure creates a linear force on the piston rod, extending it to apply force to the bending tool. The force is controlled by regulating the fluid pressure and flow via valves.
Common Materials
Hardened Steel, Chrome-plated Steel Rod, Seals (Nitrile, Polyurethane)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Bore Diameter40–320 mmDetermines force outputISO 6020-2
Stroke Length50–2000 mmCustom lengths availableISO 6020-2
Maximum Pressure25 MPaPeak pressure without permanent deformationISO 3320
Operating Temperature-20–80 °CSeals degrade outside this rangeISO 5598
Piston Rod Diameter20–180 mmAffects buckling strengthISO 6020-2
Cushioning TypeAdjustableReduces end-of-stroke impact
Seal MaterialNBR, FKM, PTFECompatible with hydraulic fluidsISO 1629
Mounting TypeFlange, Clevis, FootMust match applicationISO 6020-2
Port SizeG1/4–G1 BSPMatch flow requirementsISO 228-1
Weight5–500 kgDepends on size and mounting
Rod Surface TreatmentHard chrome platedImproves wear resistanceISO 6158

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Cylinder Barrel Part
    Houses the piston and hydraulic fluid, containing the pressure.
  • Piston Part
    Seals the cylinder bore and transfers fluid pressure into linear force.
  • Piston Rod Part
    Extends from the piston to transmit the force to the external load (bending beam).
  • End Caps Part
    Seal the ends of the cylinder barrel and provide mounting points.
  • Seals & Gaskets Part
    Prevent internal and external leakage of hydraulic fluid.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Metal Plate Bending Machine
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 300 bar (standard), 500 bar (high-pressure variants)
flow rate: Dependent on cylinder bore and rod size, typically 5-200 L/min
temperature: -20°C to 80°C (standard), -40°C to 120°C (special seals)
slurry concentration: Not recommended for slurry applications; maximum particle size < 50 μm if unavoidable
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids (HFC) ✓ Phosphate ester fluids (HFDR)
Unsuitable: Saltwater or marine environments without special corrosion protection
Sizing Data Required
  • Required force output (kN)
  • Stroke length (mm)
  • Operating pressure (bar)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seal degradation and leakage
Cause: Contamination ingress (particulates, water) causing abrasive wear, chemical incompatibility with hydraulic fluid, or excessive heat leading to hardening/cracking of elastomeric seals.
Rod scoring and cylinder bore pitting
Cause: Inadequate filtration allowing abrasive particles to embed in seals and scrape surfaces, or cavitation from rapid pressure drops causing implosion of vapor bubbles that erode metal surfaces.
Maintenance Indicators
  • Visible hydraulic fluid leakage around rod seals or cylinder ports
  • Audible knocking or chattering during operation indicating cavitation or air entrapment
Engineering Tips
  • Implement strict fluid cleanliness control with real-time particle counting and maintain ISO 4406 class 18/16/13 or better for critical systems
  • Install properly sized and maintained suction filters, ensure adequate reservoir breathers, and use rod wipers/scrapers to prevent external contamination ingress

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 6020-1: Hydraulic fluid power - Mounting dimensions for single rod cylinders, 16 MPa series ANSI/B93.5M: Hydraulic Fluid Power - Cylinders - Bore and Rod Diameter and Port Sizes for Square Head and Round Head Cylinders DIN 24334: Hydraulic cylinders; mounting dimensions for single rod cylinders, series 16 MPa

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.02 mm
  • Rod straightness: 0.1 mm per meter length
Quality Inspection
  • Pressure test: 1.5 times maximum working pressure for 5 minutes
  • Dimensional verification: Critical dimensions checked against engineering drawings using CMM

Manufacturers of Hydraulic Ram

3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

CNS Technology (Suzhou) Co., Ltd.
Anhui, CN
Also makes: Hydraulic Cylinder, Truck Crane, Agricultural Machinery
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “high load hydraulic ram”
View source page ↗ cns-hydraulic.com · checked 2026-09-16
View profile Send enquiry
Dawson Group Ltd.
Qingdao, Shandong, CN
Also makes: Material Handling Equipment, Hydraulic Press Brake, Construction Equipment and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Ram & Hand Pump”
View source page ↗ dawson-group.com · checked 2026-09-08
View profile Send enquiry
JW HYDRAULIC LIMITED
Shanghai, CN
Also makes: Hydraulic Cylinder, Power Unit, Hydraulic/Pneumatic Actuator and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “marine hydraulic ram”
View source page ↗ jwhydraulics.com · checked 2026-09-12
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What is the function of a hydraulic ram in a bending machine?

It converts hydraulic pressure into linear mechanical force to drive the bending beam or punch, applying the force needed to bend metal plates.

What are the key specifications to check?

Bore diameter, stroke length, operating pressure, maximum pressure, operating temperature, piston rod diameter, mounting type, port size, and seal material. Verify with the manufacturer.

What standards apply?

ISO 6020-2 for dimensions, ISO 3320 for maximum pressure, ISO 5598 for temperature, ISO 1629 for seal materials, ISO 228-1 for ports, ISO 6158 for rod surface treatment.

How do I ensure proper selection?

Match the ram's force and stroke to the bending machine's requirements, considering operating pressure and mounting. Confirm all values with the supplier.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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