... H8 Straightness 0.3-1.0/1000 UsageApplicable to hydraulic pressure, pneumatic cylinder,oil pump barrel, motor body, transmission shaft, ... (BKS)- Honed or SRB- packingSteel GradeST52/E355, ck20, ck45, 34CrMo4, SAE 1026, SAE4130,SAE4135, SAE4140, 27SiMnSize Processing Cylinder diameterLength / ... Blow Test, Impact Test etc), Exterior Size InspectionSKYPE: samsonhuang22 honed tube for hydraulic cylinder