• Hydraulic Oil ISO 46, 5 Litres
    Regular price £17.46
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    Hydraulic Oil ISO 46, 5 Litres

    Key Features

    • Viscosity grade: ISO VG 46
    • Type: Mineral anti-wear hydraulic oil ; HLP HM class
    • Performance: Oxidation stability ; anti-foam ; rust protection ; good demulsibility
    • Approvals: Meets DIN 51524-2 HLP ; ISO 11158 HM
    • Use: General purpose mobile and industrial hydraulics
    • Pack size: 5 Litres
    Regular price £17.46
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Hydraulic Oil ISO 46, 20 Litres - Approved Hydraulics
    Regular price £48.05
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    • Delivery to UK & Ireland

    Hydraulic Oil ISO 46, 20 Litres

    Key Features

    • Viscosity grade: iso vg 46
    • Type: anti wear hydraulic oil
    • Additives: anti oxidation ; anti foam ; anti rust
    • Applications: industrial and mobile hydraulic systems
    • Pack size: 20 litres
    Regular price £48.05
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 46, 205 Litre Barrel
    Regular price £418.06
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    • Delivery to UK & Ireland

    Hydraulic Oil ISO 46, 205 Litre Barrel

    Key Features

    • Viscosity grade: ISO VG 46
    • Type: Mineral anti-wear hydraulic oil ; HLP HM class
    • Performance: Oxidation stability ; anti-foam ; rust protection ; good demulsibility
    • Approvals: Meets DIN 51524-2 HLP ; ISO 11158 HM
    • Use: General purpose mobile and industrial hydraulics
    • Pack size: 205 Litre Barrel
    Regular price £418.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 46, 1000 Litres IBC
    Regular price £1,542.06
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    • Delivery to UK & Ireland

    Hydraulic Oil ISO 46, 1000 Litres IBC

    Key Features

    • Viscosity grade: ISO VG 46
    • Type: Mineral anti-wear hydraulic oil ; HLP HM class
    • Performance: Oxidation stability ; anti-foam ; rust protection ; good demulsibility
    • Approvals: Meets DIN 51524-2 HLP ; ISO 11158 HM
    • Use: General purpose mobile and industrial hydraulics
    • Pack size: 1000 Litres IBC
    Regular price £1,542.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Adam Hindle

    Sales Director

    I began my engineering career at Stockport College in around 2005, first completing a National Diploma in Electrical Engineering, followed by a Higher National Diploma in Mechanical Engineering. I then progressed to the University of Salford, where I earned a BEng (Hons) degree in Mechanical Engineering.

    After graduating, I started my professional career with Approved Hydraulics. I initially gained a combination of hands-on workshop experience and telephone-based sales experience. In later years, I moved into a full-time sales role and led the new crane and excavator attachments department that the company had recently established.

  • Biodegradable Hydraulic Oil, 5 Litres
    Regular price £28.03
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    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil, 5 Litres

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 5 Litres
    Regular price £28.03
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil, 20 Litres
    Regular price £90.98
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    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil, 20 Litres

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 20 Litres
    Regular price £90.98
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil, 205 Litre barrel
    Regular price £704.46
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil, 205 Litre barrel

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: 205 Litre barrel
    Regular price £704.46
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil ISO46, 1000 Litres IBC
    Regular price £3,384.06
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil ISO46, 1000 Litres IBC

    Key Features

    • Type: Rapidly biodegradable hydraulic fluid
    • Viscosity options: ISO VG 32 ; ISO VG 46
    • Base chemistry: Plant based or synthetic ester depending on grade
    • Biodegradability: Typically > 90 percent per CEC L-33-T-82
    • Use: For environmental applications where leaks must minimise impact
    • Pack size: ISO46; 1000 Litres IBC
    Regular price £3,384.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 20 Litres
    Regular price £47.46
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    • Delivery to UK & Ireland

    Hydraulic Oil ISO 32, 20 Litres

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 20 l drum
    Regular price £47.46
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 205 Litre Barrel
    Regular price £446.39
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic Oil ISO 32, 205 Litre Barrel

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 205 l barrel
    Regular price £446.39
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 1000 Litres IBC
    Regular price £1,548.06
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Hydraulic Oil ISO 32, 1000 Litres IBC

    Key Features

    • Viscosity grade: iso vg 32
    • Type: mineral ; anti wear hm ; hlp
    • Standards: iso 11158 hm ; din 51524-2 hlp
    • Kinematic viscosity @40c: 32 mm^2/s nominal
    • Air release ; water separation: good
    • Use: industrial ; mobile hydraulic pumps ; motors ; valves
    • Packaging: 1000 l ibc
    Regular price £1,548.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC
    Regular price £3,384.06
    • All Items Guaranteed
    • Delivery to UK & Ireland

    Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC

    Key Features

    • Viscosity grade: iso vg 32
    • Base fluid: synthetic ; naturally occuring esters ; ashless additive package
    • Properties: high viscosity index ; anti wear ; anti oxidant ; anti foam ; anti corrosion
    • Environmental: virtually non toxic ; biodegradable
    • Packaging: 1000 l ibc
    • Use: hydraulics in environmentally sensitive areas ; marine ; forestry ; civil works
    Regular price £3,384.06
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Oils & Lubricants

Common Calculations FAQs

Calculating force, speed, pressure, power, and efficiency in hydraulic applications.

How do you calculate actuator speed?

Actuator speed is determined by flow rate and cross-sectional area:

Speed = Flow rate ÷ Area

Flow rate is the volume of fluid delivered (in L/min or GPM).

Area is the cross-sectional area of the actuator piston: π × (diameter ÷ 2)².

How do you calculate cylinder force?

Cylinder force can be calculated using:

Force = Pressure × Area

Pressure is the system pressure (in psi or bar).

Area is the cross-sectional area of the cylinder bore (in square inches or square centimeters).

Area = π × (bore diameter ÷ 2)².

How do you calculate pressure drop across a valve?

Pressure drop can be calculated using the valve flow coefficient (Cv):

Pressure Drop (ΔP) = (Flow Rate)² ÷ (Cv² × Fluid Density)

Flow Rate is the fluid flow (in GPM or L/min).

Cv is the valve flow coefficient.

Fluid Density is the density of the hydraulic fluid.

How do you size an accumulator?

Accumulator sizing considers required flow, pressure, and pre-charge:

Accumulator Volume = Flow Rate × Time ÷ Pressure

This determines how much fluid must be stored to maintain system pressure.

How to convert psi to bar?

Use the conversion factor: 1 bar = 14.5 psi.

To convert psi to bar, divide psi by 14.5.

Example: 200 psi ÷ 14.5 = 13.79 bar.

What is pre-charge pressure in an accumulator?

Pre-charge pressure is the initial gas pressure in the accumulator before fluid enters.

It helps maintain system pressure as the accumulator discharges.

Typically set to 70–80% of system operating pressure.

What is specific gravity of hydraulic fluid?

Specific gravity is the ratio of hydraulic fluid density to water.

A value of 1 means equal density.

Less than 1 means the fluid floats; greater than 1 means it sinks.

What is torque in a hydraulic motor?

Torque is the rotational force produced based on system pressure and motor displacement:

Torque = Pressure × Displacement ÷ 2π

Pressure is the operating system pressure.

Displacement is the volume displaced per revolution (in cubic inches or cubic centimeters).

What unit is hydraulic power measured in?

Hydraulic power is measured in horsepower (HP) or kilowatts (kW).

Hydraulic horsepower can be calculated using:

HP = (Pressure (psi) × Flow rate (GPM)) ÷ 1714.

What’s the relationship between pump speed and flow?

Flow rate is directly proportional to pump speed.

If pump speed doubles, flow rate doubles (assuming constant displacement).

This is important when adjusting flow or selecting a pump for varying speeds.