Specifications 1.St52 hone tubes for hydraulic cylinder 2.High reputation 3.Golden supplier 4.Oem 5.Top quality St52 hone tubes for hydraulic cylinder Honed tube for hydraulic cylinder honed tubes for hydraulic & pneumatic cylinders 1. Material specification and ref. Document St52, bk+s, din2391 or equivalent c20 ck45 s16mn 27simn 25mn st44 st52 sae1026 2. Chemical composition (%) C (max) mn(max) si(max) s(max) p(max) 0.22 1.6 0.5 0.035 0.035 3. Mechanical properties Elongation(min) y.S (min.) uts (min.) ¡y15 470 n/mm2 580 n/mm2 4. Supply condition Cold drawn seamless steel tube, stress relieved and honed or skived roller burnished 5. Surface roughness Ra = 0.4~0.8micron 6. Tolerances on inner dia iso h8 7.Tolerances on wall thickness ¡¨¹ dia120 +/-10 % of wall thickness ¡y dia120 +/-10 % of wall thickness 8. Straightnes ¡¨¹1 mm/m 9. Od tolerance ¡¨¹ dia 40 +/-0.2 mm ¡y dia 40 ¡¨¹ dia 100 +/-0.3mm ¡y dia 100 +/-0.5mm