Hydraulic Fittings

Hydraulic fittings form part of a hydraulic system which connects hoses, pipes and tubes. There are various fittings which are used to connect the system together and help the hydraulic fluid to flow through. Hydraulic fittings, or hose fittings, are used to connect hydraulic hoses and pipes to other components such as valves and pumps.

Hydraulic fittings will usually have a male and/or female connection which join to other components. The connections are usually threaded and there are several thread standards available, such as JIC, BSP and BSPP. BSP male threads will seal with BSP female threads, for example. Popular materials include plastic, brass and stainless steel fittings.

Types of hydraulic fittings:

  • Plugs
  • Adapters
  • Couplings
  • Unions
  • Reducers
  • Elbows

How are hydraulic fittings attached?

There are several methods used to attach a hydraulic fitting. Examples include:

  • Compression fittings provide water tight connections by using pressure to seal the connection. They usually use a compression nut which, when tightened, removes space between the ferrule and the pipe.
  • Threaded fittings have screw threads on both sides of the connection. They accept connections with compatible threads and screw together for a secure connection. Not all threads provide a tight seal and may benefit from additional coatings or seals.
  • Crimped fittings require crimping of the hose to the fitting. You may require a crimping tool to achieve this.

Thread Types

Hydraulics machines are used all across the world and there are many components used in each system. Thread types are used to help make parts easily identifiable and easy to maintain and replace. Some examples of thread standards include:

  • NPT stands for National Pipe Thread where the threads are at a 60° angle. There is also NPT (National Pipe Taper) and NPS (National Pipe Straight).
  • BSP fittings stands for British Standard Pipe where the angle of the threads is 55°. This standard includes BSPT (British Standard Pipe Taper) and BSPP (British Standard Parallel Pipe).
  • Metric threads are specified by their diameter and pitch in millimetres (mm).

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Description Price Connector A Hydraulic Fitting Type Connector B Material Finish Connector A - Thread Size Connector A - Thread Standard Connector A - Gender Connector B - Thread Size Connector B - Gender Connector B - Thread Standard Maximum Operating Pressure Maximum Operating Temperature Minimum Operating Temperature
RS Stock No. 366-6221
Mfr. Part No.MIK-1
BrandParker
£51.90
Each
Units
- Hydraulic Thread Identification Kit - - - - BSPP, BSPT, Metric, NPT, SAE - - - - - - -
RS Stock No. 727-755
Mfr. Part No.VSTI1/2EDCF
BrandParker
£3.698
Each (In a Pack of 5)
Units
- Hydraulic Blanking Plug - Steel Zinc Plated 1/2in G - - - - 400bar +100°C -30°C
RS Stock No. 807-564
Mfr. Part No.4HMK4S
BrandParker
£1.78
Each (In a Pack of 2)
Units
G 1/4 Male Hydraulic Straight Threaded Adaptor G 1/4 Male Steel Yellow Chromated, Zinc Plated 1/4in G Male 1/4in Male G 450bar +120°C -40°C
RS Stock No. 871-2240
Mfr. Part No.GE06LMEDCF
BrandParker
£2.58
Each
Units
- Hydraulic Straight Threaded Adaptor M10 x 1 Male Steel Zinc Chromium 6 - - - - Male Metric 500bar - -
RS Stock No. 183-6260
Mfr. Part No.8F3MK4S
BrandParker
£6.50
1 Pack of 2
Pack(s)
G 1/2 Male Hydraulic Straight Threaded Adaptor R 3/8 Male Steel Yellow Chromated, Zinc Plated 1/2in G Male 3/8in Male R 310bar +120°C -40°C
RS Stock No. 727-733
Mfr. Part No.VSTI1/4EDCF
BrandParker
£2.296
Each (In a Pack of 5)
Units
- Hydraulic Blanking Plug - Steel Zinc Plated 1/4in G - - - - 400bar +100°C -30°C
RS Stock No. 727-727
Mfr. Part No.VSTI1/8EDCF
BrandParker
£2.072
Each (In a Pack of 5)
Units
- Hydraulic Blanking Plug - Steel Zinc Plated 1/8in G - - - - 400bar +100°C -30°C
RS Stock No. 807-621
Mfr. Part No.12-8HMK4S
BrandParker
£10.33
1 Pack of 2
Pack(s)
G 1/2 Male Hydraulic Straight Threaded Adaptor G 3/4 Male Steel Yellow Chromated, Zinc Plated 1/2in G Male 3/4in Male G 310bar +120°C -40°C
RS Stock No. 283-3420
Mfr. Part No.58298
BrandElesa
£1.336
Each (In a Pack of 5)
Units
- Hydraulic Blanking Plug - Glass Fibre Reinforced Plastic (GRP) Matte 3/4in G - - - - - +130°C -30°C
RS Stock No. 797-1956
Mfr. Part No.8WMK4WL4NMS
BrandParker
£8.565
Each (In a Pack of 2)
Units
G 1/2 Male Hydraulic Straight Threaded Adaptor G 1/2 Male Steel Zinc Plated - G Male - Male G - - -
RS Stock No. 807-435
Mfr. Part No.RI1/2EDX1/4A3C
BrandParker
£3.86
Each (In a Pack of 2)
Units
G 1/2 Male Hydraulic Straight Threaded Reducer G 1/4 Female Steel Zinc Plated 1/2in G Male 1/4in Female G 630bar +100°C -30°C
RS Stock No. 367-5922
Mfr. Part No.0915 00 13
BrandLegris
£7.38
1 Pack of 3
Pack(s)
G 1/4 Female Hydraulic Tee Threaded Adaptor G 1/4 Female Brass Nickel Plated 1/4in G Female 1/4in Female G 20bar +120°C -20°C
RS Stock No. 797-2078
Mfr. Part No.6HMK4S
BrandParker
£2.44
Each (In a Pack of 2)
Units
G 3/8 Male Hydraulic Straight Threaded Adaptor G 3/8 Male Steel Zinc Plated - G Male - Male G 350bar - -
RS Stock No. 183-6204
Mfr. Part No.4-4F3MK4S
BrandParker
£2.08
Each (In a Pack of 2)
Units
G 1/4 Male Hydraulic Straight Threaded Adaptor R 1/4 Male Steel Yellow Chromated, Zinc Plated 1/4in G Male 1/4in Male R 450bar +120°C -40°C
RS Stock No. 367-5843
Mfr. Part No.0913 00 13
BrandLegris
£5.91
1 Pack of 3
Pack(s)
R 1/4 Male Hydraulic Elbow Threaded Adaptor G 1/4 Female Brass Nickel Plated 1/4in R Male 1/4in Female G 60bar +80°C -10°C
RS Stock No. 727-749
Mfr. Part No.VSTI3/8EDCF
BrandParker
£2.672
Each (In a Pack of 5)
Units
- Hydraulic Blanking Plug - Steel Zinc Plated 3/8in G - - - - 400bar +100°C -30°C
RS Stock No. 807-570
Mfr. Part No.6-4HMK4S
BrandParker
£2.42
Each (In a Pack of 2)
Units
G 1/4 Male Hydraulic Straight Threaded Adaptor G 3/8 Male Steel Yellow Chromated, Zinc Plated 1/4in G Male 3/8in Male G 450bar +120°C -40°C
RS Stock No. 283-1339
Mfr. Part No.FZ1617
BrandEnerpac
£9.24
Each
Units
NPT 3/8-18 Male Hydraulic Straight Threaded Adaptor NPT 3/8-18 Male - - 3/8-18 NPT Male 3/8-18 Male NPT 700bar - -
RS Stock No. 807-485
Mfr. Part No.WH06LRCF
BrandParker
£14.23
Each
Units
- Hydraulic Banjo Compression Tube Fitting - Mild Steel Zinc Plated 1/8in BSP - - - - 315bar +120°C -40°C
RS Stock No. 110-517
Mfr. Part No.RI1/4EDX1/2CF
BrandParker
£4.825
Each (In a Pack of 2)
Units
G 1/4 Male Hydraulic Straight Threaded Reducer G 1/2 Female Steel Zinc Plated 1/4in G Male 1/2in Female G 400bar +100°C -30°C