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How to read China hydraulic hose fittings codes?

In the hydraulic industry, hydraulic fittings are key components that connect pipelines, equipment and components. But for many people new to the industry, the numbering and naming of hydraulic connectors can be confusing. Correct understanding and use of these numbers is a prerequisite for ensuring stable system operation and avoiding mismatches. This article will give you an in-depth explanation of the numbering and naming system of hydraulic joints to help you avoid misunderstandings in actual operations.

Almost all china hydraulic fittings factories are using the same code system, which consists of nine numbers. Understand this naming rule will make it easier to purchase hydraulic hose fittings in China.

一、Core number format

XXXXX-XX-XX T

X is a number that represents different meanings. If there is T, it means hanging nut, if there is no T, it means lock nut or no nut.

First five digit numbering rules

XXXXX-XX-XX

The first

Head type

The second
Thread system
the third
Sealing surface form
The fourth
Curvature
The fifth
Core tail type
1 male thread0  metric0  no meaning1 straight1    braided hose
2  swaged nut1 international metric1  multiseal4  45°2  4 layers spiral hose
2  BSP thread2  flat seat9  90
°
2  6 layers spiral hose
3  BSPT thread3  flat with o-ring
5  Bite type4  ORFS Thread4  24° CONE/SEAT L.T
6 interlock type5  NPT Thread5  24° CONE/SEAT H.T
7  banjo type6   JIC thread6  60°CONE/SEAT
8  flange type7 SAE thread7   74° CONE/SEAT
9  double connector8 JIS metric thread8   90° CONE/SEAT
9 JIS BSPP thread
The sixth and seventh digits are the connection specifications and dimensions.
XXXXX-XX-XX
Size code0204050608101216202432
BSP G1/8″×
28
G1/4″×
19
G3/8″×
19
G1/2″×
14
G5/8″×
14
G3/4″×
14
G1″×
11
G1.1/4″×
11
G1.1/2″×
11
G2″×
11
BSPT R1/8″×
28
R1/4″×
19
R3/8″×
19
R1/2″×
14
R3/4″×
14
R1″×
11
R1.1/4″×
11
R1.1/2″×
11
R2″×
11
NPT Z1/8″×
27
Z1/4″×
18
Z3/8″×
18
Z1/2″×
14
Z3/4″×
14
Z1″×
11.5
Z1.1/4″×
11.5
Z1.1/2″×
11.5
Z2″×
11.5
JIC 7/16″×
20
1/2″×
20
9/16″×
18
3/4″×
16
7/8″×
14
1.1/16″×
12
1.5/16″×
12
1.5/8″×
12
1.7/8″×
12
2.1/2″×
12
ORFS 9/16″×
18
11/16″×
16
13/16″×
16
1″×
14
1.3/16″×
12
1.7/16″×
12
1.11/16″×
12
2″×
12
Flange 1/2″3/4″1″1.1/4″1.1/2″2″

Metric connection specifications and dimensions

Size code121416182022242627
Metric thread12
×
1.5

1.25
14
×
1.5
16
×
1.5
18
×
1.5
20
×
1.5
22
×
1.5
24
×
1.5

2
26
×
1.5

2
27
×
1.5

2
 Code3033363942455264
Metric Thread30
×
1.5

2
33
×
1.5

2
36
×
2
39
×
2
42
×
2
45
×
2
52
×
2
64
×
2
The eighth and ninth digits indicate the inner diameter of the hose used for this joint.
XXXXX-XX-XX
code040506081012162024283240
size6810121620253238455064
Common flange specifications imperial and metric conversion table
The first
Ferrule
The second
Production standard of hose
The third
Hose layer
The fouth
Skiving or no-skving
The fifth
Speical specification
0  all ferrules0  imported hose(
SAE
0  fiber braided0  skiving0  no meaning or 4SP
1   China hose(
GB
1  sigle steel wire braided1  no-skiving1   4SH (Enhanced)
2  two layers steel wire braided8  thermoplastic pipe
3  three layers steel wire braided
4   four layer steel wire spiral
5    two layers steel wire spiral
6   six layers steel wire spiral
The sixth and seventh digits are the hose diameter.
3000 light type
FL
081216202432
imperial1/2″3/4″1″1.1/4″1.1/2″2″
metric30.238.144.450.860.371.4
6000 heavy type
FS
081216202432
imperial1/2″3/4″1″1.1/4″1.1/2″2″
metric31.741.347.65463.579.4

二、Ferrule numbering rules

XXXXX-XX
First five digit numbering rules
Code040506081012162024283240
I.D.6810121620253238455064
The number designation of hydraulic fittings is not just a random combination. Each number and letter has a specific meaning, from which the type, size, pressure rating and other key information of the fittings can be interpreted. By mastering these basics, not only can we find and replace needed connectors more efficiently, but we can also avoid possible equipment damage and safety hazards. I hope this article can provide you with a clear understanding of hydraulic fittings numbers and help you in practical operations.
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