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
MYR399.63
Each
units
- Hydraulic Thread Identification Kit - - - - BSPP, BSPT, Metric, NPT, SAE - - - - - - -
RS Stock No. 807-457
Mfr. Part No.RI3/4EDX1/2CF
BrandParker
MYR82.45
Each (In a Pack of 2)
units
G 3/4 Male Hydraulic Straight Threaded Reducer G 1/2 Female Steel Zinc Plated 3/4in G Male 1/2in Female G 315 bar +100°C -30°C
RS Stock No. 120-873
Mfr. Part No.HF14
BrandHi-Force
MYR154.61
Each
units
NPT 3/8-18 Female Hydraulic Straight Threaded Adaptor NPT 3/8-18 Female Steel - 3/8-18 NPT Female 3/8-18 Female NPT 700 bar - -
RS Stock No. 183-6248
Mfr. Part No.6-6F3MK4S
BrandParker
MYR21.865
Each (In a Pack of 2)
units
G 3/8 Male Hydraulic Straight Threaded Adaptor R 3/8 Male Steel Yellow Chromated, Zinc Plated 3/8in G Male 3/8in Male R 380 bar +120°C -40°C
RS Stock No. 183-6282
Mfr. Part No.16F3MK4S
BrandParker
MYR66.06
Each (In a Pack of 2)
units
G 1 Male Hydraulic Straight Threaded Adaptor R 1 Male Steel Yellow Chromated, Zinc Plated 1in G Male 1in Male R 240 bar +120°C -40°C
RS Stock No. 367-5821
Mfr. Part No.0913 00 10
BrandLegris
MYR14.73
Each (In a Pack of 3)
units
R 1/8 Male Hydraulic Elbow Threaded Adaptor G 1/8 Female Brass Nickel Plated 1/8in R Male 1/8in Female G 60 bar +80°C -10°C
RS Stock No. 807-463
Mfr. Part No.RI1EDX1/2CF
BrandParker
MYR103.69
Each (In a Pack of 2)
units
G 1 Male Hydraulic Straight Threaded Reducer G 1/2 Female Steel Zinc Plated 1in G Male 1/2in Female G 315 bar +100°C -30°C
RS Stock No. 797-2012
Mfr. Part No.4R6MK4S
BrandParker
MYR112.65
Each
units
G 1/4 Female Hydraulic Tee Threaded Adaptor G 1/4 Female Steel Zinc Plated - G Female - Female G 350bar - -
RS Stock No. 283-1339
Mfr. Part No.FZ1617
BrandEnerpac
MYR66.09
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 700 bar - -
RS Stock No. 797-2094
Mfr. Part No.16-16F6MK4S
BrandParker
MYR95.965
Each (In a Pack of 2)
units
G 1 Female Hydraulic Straight Threaded Adaptor G 1 Male Steel Zinc Plated - G Female - Male G 120 bar - -
RS Stock No. 797-1990
Mfr. Part No.4C6MK4S
BrandParker
MYR61.97
Each
units
G 1/4 Male Hydraulic Elbow Threaded Adaptor G 1/4 Female Steel Zinc Plated - G Male - Female G 350bar - -
RS Stock No. 807-570
Mfr. Part No.6-4HMK4S
BrandParker
MYR17.945
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 450 bar +120°C -40°C
RS Stock No. 807-413
Mfr. Part No.RI1/4EDX1/8CF
BrandParker
MYR37.095
Each (In a Pack of 2)
units
G 1/4 Male Hydraulic Straight Threaded Reducer G 1/8 Female Steel Zinc Plated 1/4in G Male 1/8in Female G 400 bar +100°C -30°C
RS Stock No. 283-1345
Mfr. Part No.FZ1614
BrandEnerpac
MYR102.08
Each
units
NPT 3/8-18 Female Hydraulic Straight Threaded Adaptor NPT 3/8-18 Female - - 3/8-18 NPT Female 3/8-18 Female NPT 700 bar - -
RS Stock No. 807-621
Mfr. Part No.12-8HMK4S
BrandParker
MYR33.10
Each (In a Pack of 2)
units
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 310 bar +120°C -40°C
RS Stock No. 797-1962
Mfr. Part No.4EMK4S
BrandParker
MYR58.33
Each
units
G 1/4 Male Hydraulic Elbow Threaded Adaptor G 1/4 Male Steel Zinc Plated - G Male - Male G 350bar - -
RS Stock No. 807-564
Mfr. Part No.4HMK4S
BrandParker
MYR12.945
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 450 bar +120°C -40°C
RS Stock No. 367-5916
Mfr. Part No.0915 00 10
BrandLegris
MYR12.98
Each (In a Pack of 3)
units
G 1/8 Female Hydraulic Tee Threaded Adaptor G 1/8 Female Brass Nickel Plated 1/8in G Female 1/8in Female G 20 bar +120°C -20°C
RS Stock No. 807-485
Mfr. Part No.WH06LRCF
BrandParker
MYR103.52
Each
units
- Hydraulic Banjo Compression Tube Fitting - Mild Steel Zinc Plated 1/8in BSP - - - - 315 bar +120°C -40°C
RS Stock No. 299-0220
Mfr. Part No.1B248-4-4
BrandParker
MYR71.39
Each
units
- - - Steel Zinc Dichromate Plated - - - - - - 400 bar - -