TECHNICAL INFORMATON - Hydraulic Technical Information

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System Tolerances And Designs

 System tolerances are the important  factors on the life span of the sealing elements. Inappropriate dimensions, tolerances and not centered hydraulic cylinders make the sealing elements wear out in short period of time and the system do not give the required performance.

All the dimensions and tolerances are indicated on the product pages of our catologue. Table 2 shows the general tolerances used in the hydraulic systems. The cylinder bore in hydraulic system is produced from ST 52 or better quality.

Sliding surfaces should have the mentioned operations (honed, grinded, etc) in order to obtain the required surface roughness values. Rods should be produced from steel (chrome plated, grinded and polished). Other cylinder parts should be from steel, steel casting, cast iron or special engineering plastics.

Below are some gland cap and piston designs in hydraulic cylinders depending on the sealing elements and applications;

NOMINAL DIMENSION
(mm)
HOLE  TOLERANCES
(µm)
OD  TOLERANCES
(µm)
>
<=
H8
H9
H10
H11
H12
e9
f7
f8
f9
h8
h9
h10 
h11
3
+14
+25
+40
+60
+100
-14
-6
-6
-6
0
0
0
0
-0
-0
-0
-0
-0
-39
-16
-20
-31
-14
-25
-40
-60
3
6
+18
+30
+48
+75
+120
-20
-10
-10
-10
0
0
0
0
-0
-0
-0
-0
-0 
-50
-2
-28
-40
-18
-30
-48
-75
6
10
+22
+36
+58
+90
+150
-25
-13
-13
-13
0
0
0
0
-0
-0
-0
-0
-0 
-61
-28
-35
-49
-22
-36
-58
-90
10
18
+27
+43
+ 70
+110
+180
-32
-16
-16
-16
0
0
0
0
-0
-0
-0
-0
-0 
-75
-34
-43
-59
-27
-43
-70
-110
18
30
+33
+52
+ 84
+130
+210
-40
-20
-20
-20
0
0
0
0
-0
-0
-0
-0
-0 
-92
-41
-53
-72
-33
-52
-84
-130
30
50
+39
+62
+100
+160
+250
-50
-25
-25
-25
0
0
0
0
-0
-0
-0
-0
-0
-112
-50
-64
-87
-39
-62
-100
-160
50
80
+46
+74
+120 
+190
+300
-60
-30
-30
-30
0
0
0
0
-0
-0
-0
-0
-0 
-134
-60
-76
-104
-46
-74
-120
-190
80
120
+54
+87
+140
+220
+350
-72
-36
-36
-36
0
0
0
0
-0
-0
-0
-0
-0
-159
-71
-90
-123
-54
-87
-140
-220
120
180
+63
+100
+160
+250
+400
-85
-43
-43
-43
0
0
0
0
-0
-0
-0
-0
-0
-185
-83
-106
-143
-63
-100
-160
-250
180
250
+72
+115
+185 
+290
+460
-100
-50
-50
-50
0
0
0
0
-0
-0
-0
-0
-0
-215
-96
-122
-165
-72
-115
-185
-290
250
315
+81
+130
+210 
+320
+520
-110
-56
-56
-56
0
0
0
0
-0
-0
-0
-0
-0
-240
-108
-137
-185
-81
-130
-210
-320
315
400
+89
+140
+230
+360
+570
-125
-62
-62
-62
0
0
0
0
-0
-0
-0
-0
-0
-265
-119
-151
-202
-89
-140
-230
-360
400
500
+97
+155
+250 
+400
+630
-135
-68
-68
-68
0
0
0
0
-0
-0
-0
-0
-0
-290
-131
-165
-223
-97
-155
-250
-400

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