材料：Gcr15，52100或SUJ2，也可按客户要求用碳素钢和不锈钢，

标准：GB/T309-2000 

硬度：HRC60-65

热处理：符合JB/T 1255的规定

公差要求按国家标准，滚子直径公差0.003mm，长度公差0.03mm；

                    滚针直径公差0.003mm，长度公差0.2mm

表面粗糙度：Ra0.2，超精后<Ra0.05

产品适用范围：汽车，摩托车，童车，纺织机械等行业

product name :needle roller

Raw material：bearing steel  GCR15, 52100, SUJ2 100Cr6

Standard: GB/T309-2000

Hardnesss: HRC60-65

Tolerance: according to the standard

                Dia of roller:0.003mm

                Length of roller: 0.03mm

           Dia of needle roller:0.003mm

           Length of needle roller:0.2mm

Roundness: Ra 0.2, or under 0.05 after superfinishing   

Used in: automobile, motocycle, baby carrier, textile machinery, etc