• 3/8" BSP Female x Female x Female Tee - Approved Hydraulics Limited
    Regular price £26.12
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    1/2" BSP Female x Female x Female Tee

    Key Features

    • Type: BSP tee adaptor
    • Connections: three female ports
    • Threads: 1/2 BSP
    • Material: plated carbon steel for hydraulic service
    • Use: split or combine lines; add instruments or auxiliary circuits
    Regular price £26.12
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/4" BSP Male to 1/2 BSP Female Pressure Guage Adaptor - Approved Hydraulics Limited
    Regular price £4.80
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    1/2" BSP Male to 1/4 BSP Female Pressure Guage Adaptor

    Key Features

    • Type: pressure gauge adaptor
    • Threads: 1/2 to 1/4 BSP
    • Seat: 60° cone or flat seat depending on gauge port style
    • Material: plated carbon steel for hydraulic service
    • Use: connect panel or test gauges; transmitters or sensors
    Regular price £4.80
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1 1/4" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £45.85
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    1/2" BSP Male x 1 1/4" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 1/2 to 1 1/4 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £45.85
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £11.87
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    1/2" BSP Male x 1" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 1/2 to 1 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £11.87
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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.

  • 3/4" BSP x 3/4" BSP Bulkhead Adaptor with Locknut - Approved Hydraulics Limited
    Regular price £23.15
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    1/2" BSP Male x 1/2" BSP Bulkhead Adaptor with Locknut

    Key Features

    • Type: bulkhead adaptor with locknut for panel/tank pass-through
    • Threads: 1/2 to 1/2 BSP
    • Hardware: includes locknut for secure clamping
    • Material: plated carbon steel
    • Use: route hose/pipe through guards or reservoirs cleanly
    Regular price £23.15
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swept 90° Elbow - Approved Hydraulics Limited
    Regular price £9.18
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    1/2" BSP Male x 1/2" BSP Female Swept 90° Elbow

    Key Features

    • Type: 90° elbow adaptor (male to male)
    • Threads: 1/2 to 1/2 BSP
    • Body: swept radius for routing clearance
    • Construction: forged carbon steel; zinc plated
    • Use: change hose direction while maintaining service access
    Regular price £9.18
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel 45° Swept Elbow
    Regular price £11.84
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    1/2" BSP Male x 1/2" BSP Female Swivel 45° Swept Elbow

    Key Features

    • Type: 45° elbow adaptor
    • Threads: 1/2 to 1/2 BSP
    • Body: swept radius for tight routing
    • Construction: forged carbon steel; zinc plated
    • Use: directional change with lower pressure drop than 90°
    Regular price £11.84
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £7.21
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    1/2" BSP Male x 1/2" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor female to female
    • Threads: 1/2 to 1/2 BSP
    • Swivel: captive nuts allow hose connection without twisting
    • Seal: flat-faced or washered seal depending on variant
    • Use: hose-to-hose connection where orientation matters
    Regular price £7.21
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSPT Tapered Adaptor - Approved Hydraulics Limited
    Regular price £4.33
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    • Delivery to UK & Ireland

    1/2" BSP Male x 1/2" BSPT Tapered Adaptor

    Key Features

    • Type: parallel-to-taper adaptor for BSP connections
    • Standards: BSPP (ISO 228) to BSPT (ISO 7) depending on ends
    • Threads: 1/2 to 1/2 BSP
    • Sealing: taper thread seals with thread sealant; parallel with washer/bonded seal
    • Use: connect tapered ports to parallel hose/valve fittings
    Regular price £4.33
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £8.32
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    1/2" BSP Male x 1/4" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor (male to female)
    • Threads: 1/2 to 1/4 BSP
    • Swivel: captive nut allows hose connection without twisting
    • Seal: cone/washer seal depending on variant
    • Use: connect hoses where rotation during assembly is restricted
    Regular price £8.32
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £11.92
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    • Delivery to UK & Ireland

    1/2" BSP Male x 3/4" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor (male to female)
    • Threads: 1/2 to 3/4 BSP
    • Swivel: captive nut allows hose connection without twisting
    • Seal: cone/washer seal depending on variant
    • Use: connect hoses where rotation during assembly is restricted
    Regular price £11.92
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/8" BSP Male x 1/2" BSP Male Adaptor - Approved Hydraulics Limited
    Regular price £6.78
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    • Delivery to UK & Ireland

    1/2" BSP Male x 3/4" BSP Male Adaptor

    Key Features

    • Type: straight adaptor (BSP adaptor)
    • Threads: 1/2 to 3/4 BSP
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £6.78
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £7.07
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    • Delivery to UK & Ireland

    1/2" BSP Male x 3/8" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor (male to female)
    • Threads: 1/2 to 3/8 BSP
    • Swivel: captive nut allows hose connection without twisting
    • Seal: cone/washer seal depending on variant
    • Use: connect hoses where rotation during assembly is restricted
    Regular price £7.07
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 3/8" BSP Fixed Female Extended Adaptor - Approved Hydraulics Limited
    Regular price £2.99
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    • Delivery to UK & Ireland

    1/2" BSP Male x 3/8" BSP Fixed Female Extended Adaptor

    Key Features

    • Type: straight thread adaptor
    • Threads: 1/2 to 3/8 thread
    • Standard: BSPP parallel unless specified otherwise
    • Material: plated carbon steel
    • Use: join hoses; valves; or adapt port sizes
    Regular price £2.99
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSP Female Swivel Adaptor - Approved Hydraulics Limited
    Regular price £9.71
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    • Delivery to UK & Ireland

    1/2" BSP Male x 5/8" BSP Female Swivel Adaptor

    Key Features

    • Type: swivel adaptor female to female
    • Threads: 1/2 to 5/8 BSP
    • Swivel: captive nuts allow hose connection without twisting
    • Seal: flat-faced or washered seal depending on variant
    • Use: hose-to-hose connection where orientation matters
    Regular price £9.71
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" BSP Male x 1/2" BSPT Tapered Adaptor - Approved Hydraulics Limited
    Regular price £14.32
    • All Items Guaranteed
    • Delivery to UK & Ireland

    1/2" BSP X 1" BSPT Tapered ADAPTOR

    Key Features

    • Type: parallel-to-taper adaptor for BSP connections
    • Standards: BSPP (ISO 228) to BSPT (ISO 7) depending on ends
    • Threads: 1/2 to 1 BSP
    • Sealing: taper thread seals with thread sealant; parallel with washer/bonded seal
    • Use: connect tapered ports to parallel hose/valve fittings
    Regular price £14.32
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Cylinder Breather
    Regular price £17.82
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    • Delivery to UK & Ireland

    1/2" Cylinder Breather

    Key Features

    • Thread: 1/2" NPT
    • Function: vents cylinder while filtering intake air
    • Benefit: balances pressure; reduces moisture and dust ingress
    • Element: integrated breather element (high-flow)
    • Use: hydraulic cylinders; small reservoirs
    Regular price £17.82
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Mulcher Valve For Femac Flails Max Low 60 LPM - Max Pressure 250 Bar
    Regular price £708.06
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    • Delivery to UK & Ireland

    1/2" Mulcher Valve For Femac Flails Max Low 60 LPM - Max Pressure 250 Bar

    Key Features

    • Port size: 1/2"
    • Max flow: 60 l/min
    • Max pressure: 250 bar
    • Function: mulcher protection valve ; anti-cavitation ; overpressure relief
    • Use: protect hydraulic motor on flail heads
    Regular price £708.06
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors - Approved Hydraulics Limited
    Regular price £6.88
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    • Delivery to UK & Ireland

    1/2" Port, 90°, 3 Hole, 30mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 30 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £6.88
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors
    Regular price £11.39
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    • Delivery to UK & Ireland

    1/2" Port, 90°, 3 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 3 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £11.39
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors - Approved Hydraulics Limited
    Regular price £9.66
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    • Delivery to UK & Ireland

    1/2" Port, 90°, 4 Hole, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: 90°
    • Port: 1/2"
    • Mounting: 4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £9.66
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2" Port, Straight, 40mm PCD, Female Gear Pump Adaptors
    Regular price £6.25
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    • Delivery to UK & Ireland

    1/2" Port, Straight, 40mm PCD, Female Gear Pump Adaptors

    Key Features

    • Type: female gear pump adaptor
    • Orientation: straight
    • Port: 1/2"
    • Mounting: 3/4 hole on 40 mm pcd
    • Use: connect pump outlet to hose or fittings
    Regular price £6.25
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Out of Stock
    Hydra Part 1/2"BSP Dual Cross-over 80Lpm Relief Valve - 130-350Bar - Approved Hydraulics
    Regular price £116.65
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    • Delivery to UK & Ireland

    1/2"BSP Dual Cross-over 80Lpm Relief Valves

    Key Features

    • Type: dual cross line relief valve
    • Port size: 1/2"bsp
    • Rated flow: 80 lpm
    • Adjustment range: 100 to 350 bar
    • Function: protects hydraulic motors from shock loads ; cross connected relief
    • Mounting: in line ; flangeable to motor on some models
    • Typical use: omp ; omr ; omh motor protection ; overrunning load control
    Regular price £116.65
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/2-3/8 BSPP Flow Divider 15-40  L/Min - 210 Bar
    Regular price £126.73
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    • Delivery to UK & Ireland

    1/2-3/8 BSPP Flow Divider 15-40 L/Min - 210 Bar

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 3/8 thread
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £126.73
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

All

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.