Inner hole roughness 0.1-0.8 um Inner hole size tolerance H8 Straightness 0.3-1.0/1000

Usage

Applicable to hydraulic pressure, pneumatic cylinder,oil pump barrel, motor body, transmission shaft, etc.

Quality Standard  

DIN 239, EN 10305 and ASTM A519 

Process

Raw materials- Cold drawn/rolled- Heat treatment(BKS)- Honed or SRB- packing

Steel  Grade

ST52/E355, ck20, ck45, 34CrMo4, SAE 1026, SAE4130,SAE4135, SAE4140, 27SiMn

Size

Processing	Cylinder diameter	Length /mm	Straightness	Size accuracy	Wall thickness/mm	Inner boreroughness
Cold-drawn	ID28~OD400	≤12M	0.3~1.0m m/m	H8-H11	±8%	0.8~1.6um
Honed tube	ID28~OD400	≤12M	0.3~1.0m  m/m	H8	±8%	0.4~0.8um

Inner hole size tolerance

ID size	ID deviation (mm)
	H7	H8	H9	H10
30	0.021	0.033	0.052	0.084
>30~50	0.025	0.039	0.062	0.1
>50~80	0.03	0.046	0.074	0.12
>80~120	0.035	0.054	0.087	0.14
>120~180	0.04	0.063	0.1	0.16
>180~250	0.046	0.072	0.115	0.185
>250~315	0.052	0.081	0.13	0.21
>315~400	0.0527	0.089	0.14	0.23

Packing   optional 

Test Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield

strength, Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size Inspection

SKYPE: samsonhuang22

honed tubes for hydraulic and pneumatic cylinder