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Understood the rubber hose, what about the fitting connector?

Jul. 14, 2020

Where there is a hose, there must be an adapter to connect the hose to work, so how much do you know about the hose fitting? Next, Let’s learn the hose fitting:

The hose fitting is a component that connects the rubber hose and the rubber hose. It is divided into: metric connector, UK type fitting and American type fitting. It is also divided into withholding hose fitting, swaged hose fitting one piece hose fitting . The material is divided into: carbon steel material / stainless steel material (201, 304, 316, 316L), carbon steel is generally galvanized for yellow zinc and white zinc.


1. Metric Fitting are generally divided into: nuts, cores, sleeves. Three-piece set. The hose has a three-piece set at one end and a six-piece set at both ends. Inch and American fitting are generally divided into two parts: the nut and core are fixed parts, and the sleeve.

1)Fitting core

The main factors that affect the performance are the length of the core rod, the shape of the structure, the wall thickness and the material. From the perspective of sealing and preventing pull-out, the core rod is required to be as long as possible, but too long will waste materials and increase manufacturing costs. In addition, in order to prevent the accumulation of glue at the end of the core during crimping, the general design requires that its length be slightly longer than the outer sleeve.

2) There are many kinds of structural shapes of the core rod, among which there are mainly R grooves and zigzag grooves, which can increase the friction surface and provide a rubber containing groove for rubber flow.

3) Sleeve: The steel wire layer of the tube determines the different specifications of the sleeve. The size of the inner hole should be appropriately larger than the size of the reinforcement layer, otherwise it cannot be installed, and even the reinforcement layer will be completely scattered. The general gap is 1-1.5mm. The groove shape inside the jacket will directly affect the quality of the joint. At present, there are straight hole slotless type, sawtooth slot type and combined ring and sawtooth slot type. Cotton thread (fiber) braided hose adopts grooveless structure because of low use pressure and low pull-out force. When the steel wire braided hose is crimped, the reinforcement layer is easy to bend and deform, and the zigzag shape is mostly used. The steel wire wound pipe generally has many layers, and the maximum thickness of one side of the reinforcing layer can be up to 3.6mm. When crimping, the reinforcing layer should be deformed into a wave shape and inserted into the groove. It is 2/3 wider than the sawtooth groove, which has stronger pull-out resistance.

Swaged hose fitting

2.Metric Fitting

1) Metric thread 24° Cone Light Series & Metric thread 24° Cone Heavy Series

2)Metric Female Multiseal

3) Metric Female Flat Seat

4) Metric Thread 74° Fitting

5) Metric Standpipe Straight Din2353

6) Jet washer hose fitting



 3.UK Type Fitting

1)BSP Thread 60° Cone Fitting

2)BSPT Male

3)BSP Female Multiseal


4.American Fitting

1)NPT Thread Fitting

2)ORFS Female Flat seat

3)JIC Female 74° Cone Seat


5.Other Type

1)SAE Flange Light Series & SAE Flange Heavy Series

2)MT Staplelock Male


4)Double Connector 


 One Piece Hose Fitting

1.Metric thread 24° Cone Light Series & Metric thread 24° Cone Heavy Series

2.BSP Thread 60° Cone Fitting

3.JIC Female 74° Cone Seat

4.ORFS Female Flat seat

5.SAE Flange Light Series & SAE Flange Heavy Series


There are many customers who have the first reaction when the hose leaks, but they do not know that most of them are the problem of seizing the fitting. In fact, there are many precautions when seizing the fitting.

Precautions for installation of hose fitting:

When seizing the fitting, insert the rubber layer and steel wire into the annular groove cut in the inner wall of the outer shell of the fitting and the outer cylindrical part of the core:

(1)The hose cannot be bent excessively during movement or at rest, nor can it be bent at the root, at least 1.5 times its diameter;

2When the hose is moved to the extreme position, it should not be pulled too tight, and should be relatively loose;

3Try to avoid torsional deformation of the hose;

4The hose should be as far away as possible from the heat radiation member, and it is necessary to wear a heat insulation board;

5Avoid external damage to the hose, such as long-term friction on the surface of the same member in use;

6If the hose is excessively deformed due to its own weight, there should be supporting parts.

7Master the compression rate of the hose and the withholding amount of the Ferrule

8Calculate according to the change of the inner diameter of the high-pressure hose and the outer diameter of the steel wire layer of the high-pressure hose and the compression ratio of the high-pressure hose to ensure that the joint and the hose are firmly pressed.


The formula for calculating the diameter of the joint jacket after withholding is D:

D=(d1-d2)+D0-(D2-D1)-E(D1-d2-A)( m m )!

D0-OD ; D2-outer jacket OD of Ferrule 5 [) s3 N* |! i5 {" t7 _5 W8 G) H" W

D1- OD of 1 layer steel ,( S; Y) I  O4 ]

d1- OD of fitting cone.}

D2-Hose ID’7 E. o5 ~# r/ K' q' N. t* D

A-think of steel

E-compression ratio. E value: 1 layer 0.4-0.43, 2 layers 0.43-0.46, 3 layers 0.46-0.50. 4 layers 0.55-0.60


Through the above introduction, I believe everyone has a certain understanding of the hose fitting. If you need it, please consult our sales staff, or want to discuss more technical knowledge, you can also contact our technical staff, we will see you next time! 

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Alice Kuang




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