Our ISO H8 Tolerance Cylinder Tubes represent the highest standard in precision-engineered hydraulic cylinder components. These premium honed tubes are manufactured with exceptionally tight H8 tolerance limits, ensuring superior dimensional accuracy and reliable performance in critical hydraulic applications. Unlike standard H9 tolerance tubes, our H8 grade offers enhanced precision for demanding applications where minimal clearance and maximum precision are required. These tubes are perfect for high-pressure hydraulic systems, precision industrial machinery, and applications requiring exceptional positional accuracy.
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ISO H8 Tolerance Cylinder Tubes
Cylinder Tubes for Hydraulic Applications product overview Series Description: ISO H8 Cylinder Tubes, Inside Honed or Skived and Roller Burnished steel.
Standards available:EN10305-1,EN 10305-2 ,EN 10297, DIN2391, DIN2393, JIS 3445, ASTM A519
Grade available:grade: E355, DIN St52, B.S. CFS5, JIS STKM19A ,AISI /SAE /ASTM 1524 / 1024, GOST St6sp
Inside Surface Roughness Ra ≤ 0.22 µm
Local Deviation max. 1 mm : 1000 mm
Total Deviation Tubes with length ≤ 6 m: max. 3.5 mm : 1000 mm
H8 Tolerances
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H8 Tolerances (All tolerances are + gures shown/ -0.00) |
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Inside Dia mm |
18~30 |
30~50 |
50~80 |
80~120 |
120~180 |
180~ 250 |
250~ 315 |
315~ 400 |
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ID tolerance mm |
0.033 |
0.039 |
0.046 |
0.054 |
0.063 |
0.072 |
0.081 |
0.089 |
Seamless cold drawn( SCD) tubes EN10305-1 (DIN 2391) Skived and roller burnished H8
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Manufacturing standard |
EN 10305-1 E355SR |
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Straightness |
1,0 mm/1000 mm |
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Eccentricity (wall thickness tolerance) |
+/- 7,5% wall thickness |
|
Inside surface roughness |
Ra < 0,2 µm // Rt < 3 µm |
|
Inside surface tpi |
> 60% a 0,17 um of depth |
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Inside surface hardness |
HB 190-245 |
|
Manufacturing length |
5-10 m |
Drawn Over a Mandrel DOM tubes EN 10305-2 Skived and roller burnished H8
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Manufacturing standard |
EN 10305-2 (DIN2393) E355SR |
|
Straightness |
1,0 mm/1000 mm |
|
Eccentricity (wall thickness tolerance) |
+/- 3-5% wall thickness |
|
Inside surface roughness |
Ra < 0,2 µm // Rt < 3 µm |
|
Inside surface tpi |
> 60% a 0,17 um of depth |
|
Inside surface hardness |
HB 190-245 |
|
Manufacturing length |
5-10 m |
Hot rolled tubes EN 10297 bored and honed tube H8
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Manufacturing standard |
EN 10297 (DIN2448/1629) E355 / E355K2 +N |
|
Straightness |
1,0 mm/1000 mm // on request, 0,1 mm/1000 mm |
|
Eccentricity (wall thickness tolerance) |
+/- 12,5% wall thickness |
|
Inside surface roughness |
Ra < 0,4 µm // Rt < 3 µm |
|
Inside surface tpi |
> 60% a 0,17 um of depth |
|
Inside surface hardness |
HB 150 - 200 |
|
Inside surface hardness |
3-10 m |
Applications
High-pressure hydraulic cylinders
Precision pneumatic cylinders
Injection molding machines
Industrial presses and machine tools
Mobile hydraulics (construction, agriculture)
Marine and offshore equipment
Automation and robotics systems
FAQ
Q: What is the difference between H8 and H9 tolerance?
A: H8 tolerance is approximately 30-50% tighter than H9 tolerance, providing better dimensional control for precision applications.
Q: Can you provide custom sizes?
A: Yes, we can manufacture custom diameters and lengths according to your requirements.
Q: Do you provide material certificates?
A: Yes, we provide EN 10204 3.1 material certificates with all shipments.
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