• Weld collars 123mm (AC Motors)
    Regular price £10.85
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    Weld collars 123mm (AC Motors)

    Key Features

    • Size: 123 mm
    • Function: weld on collar for tank neck
    • Use: mount 120 mm ; 123 mm filler necks to custom reservoirs
    • Material: steel
    • Applications: power pack tanks ; bespoke fabrications
    Regular price £10.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Weld collars 120mm (DC Motors)
    Regular price £10.85
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    Weld collars 120mm (DC Motors)

    Key Features

    • Size: 120 mm
    • Function: weld on collar for tank neck
    • Use: mount 120 mm ; 123 mm filler necks to custom reservoirs
    • Material: steel
    • Applications: power pack tanks ; bespoke fabrications
    Regular price £10.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3 kW Drive Coupling
    Regular price £3.45
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    3 kW Drive Coupling

    Key Features

    • Power rating: 3 kw
    • Role: elastic drive element for motor ; pump coupling
    • Use: b14 mounting kits ; compact power units
    • Compatibility: group 1 pump semi couplings
    • Function: damp torsional vibration ; align drive
    Regular price £3.45
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  • Group 1.0 Pump Side Coupling For Mounting kit for B14 AC motor
    Regular price £4.55
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    Group 1.0 Pump Side Coupling For Mounting kit for B14 AC motor

    Key Features

    • Pump group: group 1
    • Role: pump side semi coupling ; tang drive
    • Mates with: b14 motor side coupling frames 71 ; 80 ; 90 ; 100/112
    • Use: couples gear pump to motor via elastic drive
    • Application: ac mini power packs
    Regular price £4.55
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  • 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.

  • Motor side Coupling For Mounting kit for frame 100/112 B14 AC motor
    Regular price £17.86
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    Motor side Coupling For Mounting kit for frame 100/112 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 100/112
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £17.86
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  • Motor side Coupling For Mounting kit for frame 90 B14 AC motor
    Regular price £15.19
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    Motor side Coupling For Mounting kit for frame 90 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 90
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £15.19
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  • Motor side Coupling For Mounting kit for frame 80 B14 AC motor
    Regular price £12.64
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    Motor side Coupling For Mounting kit for frame 80 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 80
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £12.64
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    • Order by 3pm for Next Day Delivery
  • Motor side Coupling For Mounting kit for frame 71 B14 AC motor
    Regular price £11.21
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    Motor side Coupling For Mounting kit for frame 71 B14 AC motor

    Key Features

    • Interface: iec b14 motor face
    • Frame size: 71
    • Role: motor side semi coupling
    • Mates with: group 1 pump side coupling
    • Use: connect ac motor to gear pump in mounting kit
    Regular price £11.21
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    • Order by 3pm for Next Day Delivery
  • 15L Steel Hydraulic Tank 123mm (AC) Neck Flange
    Regular price £48.60
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    15L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 15 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £48.60
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12L Steel Hydraulic Tank 123mm (AC) Neck Flange
    Regular price £45.90
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    12L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 12 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £45.90
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 10L Steel Hydraulic Tank 123mm (AC) Neck Flange
    Regular price £43.74
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    10L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 10 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £43.74
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 8L Steel Hydraulic Tank 123mm (AC) Neck Flange
    Regular price £42.38
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    8L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 8 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £42.38
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 5L Steel Hydraulic Tank 123mm (AC) Neck Flange
    Regular price £38.17
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    5L Steel Hydraulic Tank 123mm (AC) Neck Flange

    Key Features

    • Capacity: 5 l
    • Neck flange: 123 mm ac
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: ac motor power pack builds ; 123 mm neck accessories
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 15L Steel Hydraulic Tank 120mm (DC) Neck Flange
    Regular price £48.60
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    • Delivery to UK & Ireland

    15L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 15 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £48.60
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 12L Steel Hydraulic Tank 120mm (DC) Neck Flange
    Regular price £45.90
    • All Items Guaranteed
    • Delivery to UK & Ireland

    12L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 12 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £45.90
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 10L Steel Hydraulic Tank 120mm (DC) Neck Flange
    Regular price £43.74
    • All Items Guaranteed
    • Delivery to UK & Ireland

    10L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 10 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £43.74
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 8L Steel Hydraulic Tank 120mm (DC) Neck Flange
    Regular price £42.38
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    • Delivery to UK & Ireland

    8L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 8 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £42.38
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 5L Steel Hydraulic Tank 120mm (DC) Neck Flange
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland

    5L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 5 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £38.17
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 4L Steel Hydraulic Tank 120mm (DC) Neck Flange - Approved Hydraulics Limited
    Regular price £35.33
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    • Delivery to UK & Ireland

    4L Steel Hydraulic Tank 120mm (DC) Neck Flange

    Key Features

    • Capacity: 4 l
    • Neck flange: 120 mm dc
    • Material: steel
    • Orientation: vertical ; horizontal mounting
    • Use: mini hydraulic power packs reservoir
    • Compatibility: dc motor power pack builds ; 120 mm neck accessories
    Regular price £35.33
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Starter Solenoid Cables & Copper bar kit
    Regular price £3.76
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    • Delivery to UK & Ireland

    Starter Solenoid Cables & Copper bar kit

    Key Features

    • Kit contents: starter cabling ; copper link bar
    • Application: dc power pack starter ; solenoid wiring
    • Voltage: 12 vdc ; 24 vdc systems
    • Use: compact power units ; tail lifts ; tippers ; lifts
    • Hardware: ring terminals ; fixings as supplied
    Regular price £3.76
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Biodegradable Hydraulic Oil ISO32, 1000 Litres IBC
    Regular price £3,384.06
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    • 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
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 1000 Litres IBC - Approved Hydraulics Limited
    Regular price £1,548.06
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    • 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
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydraulic Oil ISO 32, 205 Litre Barrel - Approved Hydraulics Limited
    Regular price £446.39
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    • 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
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • CETOP 5 - Steel Manifold with Relief Cavity - P&T 3/4" -  A&B 1/2"
    Regular price From £67.54
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    CETOP 5 - Steel Manifold with Relief Cavity - P&T 3/4" - A&B 1/2"

    Key Features

    • Standard: cetop 5 ; iso 4401-05 ; ng10
    • Ports: p ; t 3/4" bspp ; a ; b 1/2" bspp
    • Relief cavity: main pressure relief cavity provided ; blanking plug when no cartridge
    • Max working pressure: 315 bar
    • Circuit: parallel
    • Stations: 1 ; 2 ; 3 ; 4 ; 5 ; 6 options
    • Material: steel
    • Use: mounting of ng10 directional valves ; high flow manifolds
    Regular price From £67.54
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

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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.