• Motor Flange Assembly Screw For Mounting kit for frame 90 B14 AC motor
    Regular price £1.52
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    Motor Flange Assembly Screw For Mounting kit for frame 90 B14 AC motor

    Key Features

    • Standard: din 912
    • Thread: m8 x 16
    • Use: motor flange to kit frame 90 b14
    • Material: steel
    • Quantity: set of 4 typical
    Regular price £1.52
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  • Motor Flange Assembly Screw For Mounting kit for frame 100/112 B14 AC motor
    Regular price £1.50
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    Motor Flange Assembly Screw For Mounting kit for frame 100/112 B14 AC motor

    Key Features

    • Standard: din 912
    • Thread: m8 x 55
    • Use: motor flange to kit frames 100/112 b14
    • Material: steel
    • Quantity: set of 4 typical
    Regular price £1.50
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  • Motor Flange Assembly Screw For Mounting kit for frame 71 & 80 B14 AC motor
    Regular price £1.50
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    Motor Flange Assembly Screw For Mounting kit for frame 71 & 80 B14 AC motor

    Key Features

    • Standard: din 912
    • Thread: m6 x 16
    • Use: motor flange to kit frames 71 ; 80 b14
    • Material: steel
    • Quantity: set of 4 typical
    Regular price £1.50
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  • Electrical plug for 12/24VDC coils EP3/4 kits
    Regular price £1.49
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    Electrical plug for 12/24VDC coils EP3/4 kits

    Key Features

    • Connector: DIN 43650-A ; 3 pole + earth
    • Ingress protection: IP65 with gasket
    • Rating: up to 240 vac ; 10 a
    • Use: mates to EP3/EP4 solenoid coils 12 ; 24 vdc
    • Application: hydraulic component
    Regular price £1.49
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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.

  • Return Pipe Vertical 180mm
    Regular price £1.40
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    Return Pipe Vertical 180mm

    Key Features

    • Orientation: vertical
    • Length: 180 mm
    • Connection: g 1/4 interface
    • Use: return oil from manifold to tank
    • Application: mini power pack
    Regular price £1.40
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  • Return pipe horizontal
    Regular price £1.40
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    Return pipe horizontal

    Key Features

    • Orientation: horizontal
    • Function: return oil from cetop stack to tank
    • Connection: g 1/4 interface
    • Use: mini power pack tank
    • Note: select length to suit tank depth
    Regular price £1.40
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  • Coupling Screw For Mounting kit for frame 71-80 - 90-100/112 B14 AC motor
    Regular price £1.14
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    Coupling Screw For Mounting kit for frame 71-80 - 90-100/112 B14 AC motor

    Key Features

    • Standard: din 912
    • Thread: m6 x 8
    • Use: secures elastic drive element to semi couplings
    • Compatibility: frames 71 ; 80 ; 90 ; 100/112 b14
    • Note: apply thread lock per assembly guide
    Regular price £1.14
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  • M18 Dowty Washer
    Regular price £0.82
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    M18 Dowty Washer

    Key Features

    • Size: M18 metric bonded seal
    • Dimensions: ID 18.7 mm ; OD 26.0 mm ; thickness 1.5 mm
    • Materials: steel ring ; NBR elastomer
    • Alternatives: stainless ring ; FKM ; EPDM options
    • Pressure capability: up to 250 bar standard
    • Temperature range: -30 to +200 degC depending on elastomer
    • Surface finish for sealing: Rmax <= 15 um ; Ra <= 3.2 um recommended
    • Applications: static sealing under bolt heads ; threaded stud ends in hydraulic ports
    Regular price £0.82
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  • Grease Nipple 1/8 BSP
    Regular price £0.78
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    Grease Nipple 1/8 BSP

    Key Features

    • Thread: 1/8 bsp
    • Type: standard zerk lubrication fitting
    • Use: periodic greasing of moving joints
    • Application: hydraulic levers ; linkages ; hinges
    • Application: hydraulic component
    Regular price £0.78
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  • SCREW ST4,8x25 (DIN15481)
    Regular price £0.20
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    SCREW ST4,8x25 (DIN15481)

    Key Features

    • Standard: DIN 15481
    • Size: ST4;8 x 25
    • Type: thread-forming screw for metal
    • Head: pan/countersunk style (per variant)
    • Use: securing covers; guards; light-duty components
    Regular price £0.20
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    Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise

    Key Features

    • Configuration: Group 2 tandem external gear pump
    • Displacement range: Front 4.5 cc/rev up to rear 25 cc/rev options
    • Rotation: Clockwise
    • Shaft ; flange: 1/8 taper ; 4 bolt European flange
    • Ports: BSPP threaded or flanged options by build
    • Max pressure: Up to 250 bar depending on size
    • Use: Dual circuit supply for steering ; work hydraulics
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  • Series 880 Crutch Cylinders

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    Series 880 Crutch Cylinders

    Key Features

    • Application: Heavy duty crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Notes: Designed for higher load support with compact build
    • Use: Stabilisers ; props ; outriggers

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  • Series 800 Crutch Cylinders

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    Series 800 Crutch Cylinders

    Key Features

    • Application: Crutch ; support leg cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Construction: Welded steel ; chrome plated rod
    • Use: Stabilisers ; props on mobile plant

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  • Series 640 Top Link Cylinders

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    Series 640 Top Link Cylinders

    Key Features

    • Use: Heavy duty top link variant
    • Mounting: Hitch compatible ; ball ends
    • Rated pressure: 200-250 bar class
    • Supply: Complete with hoses
    • Applications: Demanding agricultural implements

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  • Series 600 Top Link Cylinders

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    Series 600 Top Link Cylinders

    Key Features

    • Use: Hydraulic top link family for tractors
    • Bore ; rod options: ≈60/35 ; 80/40 ; 100/45 mm depending on model
    • Pressure: 200 bar typical ; 250 bar max
    • Supply: Often supplied complete with hoses
    • Function: Remote implement angle control on 3 point hitch

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  • Series 590 Turn Over Plough Cylinders

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    Series 590 Turn Over Plough Cylinders

    Key Features

    • Application: Turn-over ; reversible plough actuation
    • Action: Double acting
    • Holding: Typically supplied with pilot operated check for safe position holding
    • Working pressure: Up to 250 bar
    • Temperature range: -25 °C to +80 °C
    • Duty: Agricultural implement rotation ; alignment

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  • Series 500 Front Flange Cylinders

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    Series 500 Front Flange Cylinders

    Key Features

    • Mounting: Front flange welded cylinder
    • Action: Double acting
    • Working pressure: Up to 250 bar
    • Speed: Up to 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Applications: Mobile ; industrial where flange mount is required

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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise

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    Tandem Hydraulic Pump Assembly 4.5cc - 25cc- Clockwise

    Key Features

    • Configuration: Group 2 tandem external gear pump
    • Displacement range: Front 4.5 cc/rev up to rear 25 cc/rev options
    • Rotation: Clockwise
    • Shaft ; flange: 1/8 taper ; 4 bolt European flange
    • Ports: BSPP threaded or flanged options by build
    • Max pressure: Up to 250 bar depending on size
    • Use: Dual circuit supply for steering ; work hydraulics

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  • Series 400 Double Acting Cylinders

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    Series 400 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder ; heavy duty
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Construction: Welded steel body ; chrome rod ; honed tube
    • Applications: Mobile equipment ; agricultural ; industrial actuators

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  • Series 300 Double Acting Cylinders

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    Series 300 Double Acting Cylinders

    Key Features

    • Type: Double acting welded cylinder
    • Working pressure: 200 bar nominal ; 250 bar max
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Rod material: C45 hard chrome plated
    • Tube: ST52.3 DIN 2393 honed ; ISO H9 tolerance
    • Fluid: Mineral hydraulic oil

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  • Series 100 Single Acting Cylinders

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    Series 100 Single Acting Cylinders

    Key Features

    • Type: Single acting hydraulic cylinder
    • Max working pressure: 250 bar
    • Max speed: 0.5 m/s
    • Temperature range: -25 °C to +80 °C
    • Fluid: Mineral oil to ISO 11158 HM ; HLP
    • Applications: Simple lift ; tilt ; clamp duties on mobile equipment

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  • Tandem Hydraulic Pump Assembly 4.5cc - 25cc (Anti-Clockwise)

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    Tandem Hydraulic Pump Assembly 4.5cc - 25cc (Anti-Clockwise)

    Key Features

    • Type: tandem hydraulic pump assembly
    • Displacement: 4.5 to 25 cc per rev per section
    • Rotation: anti clockwise
    • Ports: bspp
    • Use: compact dual circuit pump drive

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  • Hydra Part 250L GS Sectional Control Valve - Approved Hydraulics

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    240L GS Sectional Control Valve

    Key Features

    • Type: sectional directional valve
    • Nominal flow: 240 lpm
    • Sections: 1 to 12
    • Integrated valves: main relief ; load check on each section
    • Circuit options: parallel ; tandem ; series
    • Carry over: hp carry over port optional
    • Spool control: manual ; pneumatic ; hydraulic ; electro-hydraulic ; remote cable

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  • Hydra Part 150L GS Sectional Control Valve - Approved Hydraulics

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    150L GS Sectional Control Valve

    Key Features

    • Type: sectional directional valve
    • Nominal flow: 150 lpm
    • Sections: 1 to 12
    • Integrated valves: main relief ; load check on each section
    • Circuit options: parallel ; tandem ; series
    • Carry over: hp carry over port optional
    • Spool control: manual ; pneumatic ; hydraulic ; electro-hydraulic ; remote cable

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Hydra Part

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.