螺纹的应力分散结构是在旋转台肩式接头上加工的一个形状,他去除了不工作的外螺纹或内螺纹,这一过程使得接头更牢固并减小了在此高应力区的裂纹开裂破坏。螺纹的应力释放结构是任选的,如果客户在订单上注明,本公司可以提供符合API标准规定的应力分散槽。为了提供奥钻具产品的疲劳强度,请考虑加工这样的切槽。
钻铤规格 | 外径 | 内径 | 长度 | 倒角直径 | 参考弯曲 |
mm | in | mm | in | mm | mm | 强度比 |
NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/4 | 9150 | 76.2 | 2.57 :1
|
NC26-35 | 88.9 | 31.2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42 :1 |
NC31-41 | 104.8 | 4 1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43 :1 |
NC35-47 | 120.7 | 4 3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58 :1 |
NC3850 | 127.0 | 5 | 57.2 | 2 1/4 | 9150 | 121.0 | 2.38 :1 |
NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150或9450 | 144.5 | 2.49 :1 |
NC44-62 | 158.8 | 6 1/4 | 57.2 | 2 1/4 | 9150或9450 | 149.2 | 2.91 :1 |
NC44-62(4IF) | 158.8 | 6 1/4 | 71.4 | 2 13/16 | 9150或9450 | 150.0 | 2.63 :1 |
NC46-65(4IF) | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150或9450 | 154.8 | 2.76 :1 |
NC46-65(4IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150或9450 | 154.8 | 3.05 :1 |
NC46-67(4IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150或9450 | 159.5 | 3.18 :1 |
NC50-67(4 1/2IF) | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150或9450 | 159.5 | 2.37 :1 |
NC50-70(4 1/2IF) | 177.8 | 7 | 57.2 | 2 1/4 | 9150或9450 | 164.7 | 2.54 :1 |
NC50-70(4 1/2IF) | 177.8 | 7 | 71.4 | 2 13/16 | 9150或9450 | 164.7 | 2.73 :1 |
NC50-72(4 1/2IF) | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150或9450 | 169.5 | 3.12 :1 |
NC50-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150或9450 | 185.3 | 2.70 :1 |
NC50-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150或9450 | 190.1 | 3.02 :1 |
6 5/8REG | 209.6 | 8 1/4 | 71.4 | 2 13/16 | 9150或9450 | 195.7 | 2.93 :1 |
NC61-90 | 228.6 | 9 | 71.4 | 2 13/16 | 9150或9450 | 212.7 | 3.17 :1 |
7 5/8REG | 241.3 | 9 1/2 | 76.2 | 3 | 9150或9450 | 223.8 | 2.81 :1 |
NC70-97 | 247.6 | 9 3/4 | 76.2 | 3 | 9150或9450 | 232.6 | 2.57 :1 |
NC 70-100 | 254.0 | 10 | 76.2 | 3 | 9150或9450 | 237.3 | 2.81 :1 |
8 5/8REG | 279.4 | 11 | 76.2 | 3 | 9150或9450 | 266.7 | 2.84 :1 |