Hydraulic Cylinder

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Hydraulic Cylinder
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Precision Seamless Steel Pipe for Hydraulic and Pneumatic Cylinders
Specification: I.D30-500mm
Wall thickness: 2-50mm
Material: 20#, 45#, 16Mn, 27SiMn, 25Mn
Standard: GB/T8713-88 GB/T3639-2000 DIN2391 EN10305

Mechanical Property
Steel type BK BKS
Tensile strength T.SbN/mm2 Elongation 5% Tensile strength bN/mm2 Yield strength sN/mm2 Elongation 5%
20# ≥550 ≥8 ≥520 ≥375 ≥10
45# ≥640 ≥5 ≥600 ≥520 ≥10
16Mn ≥640 ≥5 ≥600 ≥520 ≥15
25Mn ≥640 ≥5 ≥600 ≥510 ≥15
27SiMn ≥840 ≥5 ≥800 ≥720 ≥10
Dimensional Tolerance
Internal diameter size Internal diameter tolerance Wall thickness tolerance
H8 H9 H10 ±5%
30 +0.033 +0.052 +0.084
>30-50 +0.039 +0.062 +0.100
>50-80 +0.046 +0.074 +0.120
>80-120 +0.054 +0.087 +0.140
>120-180 +0.063 +0.100 +0.160
>180-250 +0.072 +0.115 +0.185
>250-315 +0.081 +0.130 +0.210
>315-400 +0.089 +0.140 +0.230
Product Description
Processing method Cylinder bore Length Straightness Dimensional accuracy Bore roughness
Cold rolling 30-100 ≤12M 0.3-1.0 H8-H10 0.4-1.6
Cold drawing 30-250 ≤12M 0.3-1.0 H8-H10 0.8-1.6
Honing 40-500 ≤12M 1000 H8-H10 0.4-0.8
Rolling 40-400 ≤7M 1000 H8 0.1-0.4
Standard Specification
Internal diameter mm External diameter mm Wall thickness mm Weight kg/m Internal diameter mm External diameter mm Wall thickness mm Weight kg/m Internal diameter mm External diameter mm Wall thickness mm Weight kg/m
30 36 3 2.44 90 114 12 30.18 160 170 5 20.34
40 50 5 5.55 100 108 3.5 8.93 160 172 6 24.56
40 55 7.5 8.79 100 114 7 18.47 160 180 10 41.92
40 58 9 10.88 100 121 10.5 28.61 160 184 12 50.90
50 60 5 6.78 100 127 13.5 37.79 160 194 17 74.20
50 63 6.5 9.06 110 120 5 14.18 180 192 6 27.52
50 65 7.5 10.63 110 126 8 23.28 180 194 7 32.28
50 70 10 14.80 110 133 11.5 34.46 180 200 10 46.86
55 65 5 7.40 110 140 15 46.42 180 203 11.5 54.31
55 70 7.5 11.56 120 140 10 32.06 180 219 19.5 95.93
60 70 5 8.01 120 146 13 42.64. 200 216 8 41.03
60 75 7.5 12.48 125 135 5 16.03 200 219 9.5 49.08
63 69 3 4.88 125 140 7.5 24.51 200 232 16 85.22
63 73 5 8.38 125 152 13.5 46.11 200 245 22.5 123.45
63 76 6.5 11.14 125 159 17 59.53 220 250 15 86.93
63 83 10 18.00 140 152 6 21.60 220 273 26.5 161.09
70 83 6.5 12.26 140 159 9.5 35.00 250 270 10 64.12
70 86 8 15.39 140 163 11.5 42.96 250 299 24.5 165.80
80 86 3 6.14 140 168 14 53.17 280 325 22.5 167.84
80 90 5 10.48 140 178 19 74.50 300 325 12.5 96.33
80 95 7.5 16.18 140 180 20 78.91 300 351 25.5 204.68
80 102 11 24.68 150 160 5 19.11 300 377 38.6 321.38
80 108 14 32.45 150 163 6.5 25.09 320 351 15.5 128.24
90 100 5 11.71 150 170 10 39.46 320 377 28.5 224.93
90 105 7 18.03 150 175 12.5 50.09 400 426 13 132.40
90 108 9 21.97 150 180 15 61.03 400 480 40 434.02

Cold Drawn Precision Steel Pipe for the Cylinder of Oil Well Pump
Material: st45 ck45
Hardness: st45 HB:165-200 ck45HB:207-240
Length: ≤11mm
Bore roughness: Ra≤1.6um

Hardness type Nominal diameter External diameter (mm) Internal diameter (mm) Internal diameter tolerance Bore roundness
Chroming 28 41.28 28.58 Length ≤11mm +0.03 -0.05 Length ≥8mm -0.05 -0.15 0.03
32 44.45 31.75
47.75
38 50.80 38.10
54.10
44 57.10 44.45
60.45
57 69.85 57.15
73.15
70 82.55 69.85 -0.03 -0.15 0.05
85.85
83 95.25 82.55 -0.15 -0.25
98.55
95 11.25 95.25
108 123.95 107.95
Carbonitriding 32 44.45 31.75 -0.15 -0.25
0.05
38 50.80 38.10
44 57.15 44.45
57 69.85 57.15
70 82.55 69.85

As an experienced hydraulic cylinder manufacturer and supplier in China, Hengtong also provides piston rod, wind tower welding equipment, welding manipulator, CNC cutting machine, and more.

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  • Piston Rod Material: st45 ck45
    Hardness: st45 HB:165-200 ck45HB:207-240
    Length: ≤11mm ...
  • Cold Drawn Steel Pipe Specification: I.D30-500mm
    Wall thickness: 2-50mm
    Material: 20#, 45#, 16Mn, 27SiMn, 25Mn ...