• Femac T9 FS Hammer Pin - Approved Hydraulics Limited
    Regular price £43.26
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    • Delivery to UK & Ireland

    Femac T9 FS Hammer Pin

    Key Features

    • Use: hammer pin for fs rotor
    • Compatibility: t9 fs rotor hammers
    • Construction: hardened steel
    • Note: replace with matching bushes
    • Application: hydraulic attachment component
    Regular price £43.26
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Femac T11&T13 FS Securing pin Nut To Suit HF19 Kit - Approved Hydraulics Limited
    Regular price £18.22
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    • Delivery to UK & Ireland

    Femac T11&T13 FS Securing pin Nut To Suit HF19 Kit

    Key Features

    • Use: nut for hf19 securing pin
    • Compatibility: t11 fs ; t13 fs rotors
    • Type: self locking ; high tensile
    • Note: pair with hf19 pin as kit
    • Application: hydraulic attachment component
    Regular price £18.22
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Femac T11 FS & T13FS HF19 Pin - Approved Hydraulics Limited
    Regular price £52.86
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    • Delivery to UK & Ireland

    Femac T11 FS & T13FS HF19 Pin

    Key Features

    • Use: securing pin for hf19 hammer
    • Compatibility: t11 fs ; t13 fs rotors
    • Construction: hardened steel
    • Notes: pair with matching nut ; bush
    • Application: hydraulic attachment component
    Regular price £52.86
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Femac KM 30 (Casappa) Motor Vari Seal  For T9 & T13 Flail   (Shaft Seal Only)
    Regular price £62.46
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    • Delivery to UK & Ireland

    Femac KM 30 (Casappa) Motor Vari Seal For T9 & T13 Flail (Shaft Seal Only)

    Key Features

    • Seal type: ptfe variseal for km 30 motor
    • Function: shaft sealing under fluctuating pressure
    • Typical media: hydraulic oil ; water-glycol
    • Install: use with matching back-up ring
    • Note: confirm shaft diameter ; groove spec before order
    Regular price £62.46
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    • 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.

  • Chains for TE120p Rev forestal
    Regular price £4.56
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    • Delivery to UK & Ireland

    Chains for TE120p Rev forestal

    Key Features

    • Part number: 302010-CHAIN
    • Equipment compatibility: TE120p Rev forestal
    • Component type: Replacement chain set for forestry attachment
    • Function: Power transmission or guarding chain in moving mechanism
    • Duty: Designed for heavy duty; high shock forestry environments
    • Typical use: Forestry attachment servicing and wear part replacement
    Regular price £4.56
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Blade flail for TE80 and 100 LT - Approved Hydraulics Limited
    Regular price £7.20
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    • Delivery to UK & Ireland

    Blade flail for TE80 and 100 LT

    Key Features

    • Compatibility: te80 ; te100 lt heads
    • Type: replacement knife blade
    • Material: hardened steel
    • Use: grass ; hedge trimming
    • Application: hydraulic attachment component
    Regular price £7.20
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1200mm Rotor Bar for T13 FR130 - Approved Hydraulics Limited
    Regular price £82.08
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    • Delivery to UK & Ireland

    1200mm Rotor Bar for T13 FR130

    Key Features

    • Length: 1200 mm
    • Compatibility: t13 fr130 rotor
    • Role: hammer carrier bar
    • Material: high strength steel
    • Balance: install in matched pairs
    Regular price £82.08
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Flail Spares

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.