1.1Maintain material character oridinarily to adopt low carbon steel,Also may adopt 15CrMo to await that else let drop carbon high grade alloy steel on the basis of the necessaries .After chemistry thermal treatment,Intensity and wearproof quality that is enough are haveed,Also may supply copper facing,Silvering,Phosphorusization.That the blackout awaits goes through the particular surface treatment shelf maintaining.
1.2The module accords with that the currently in effect state nation labels either the ministry labels ,Also may supply raised form of neutral zone mends the form trundles the needle with the special needle series.Please illustrate when the order.
1.3When the needles are running directly in the shaft or in outer case,to make the needle retainer assembly reach its fully load capacity,the hardness of the inner and outer tray surface must reach 58-62HRC and the roughness must not greater than 0.32 µm.the surface quality must be the same of rolling bearing tray.