API接头扣型与国内名称对照表 | ||||
现场叫法 | API标准接头扣型 | 每英寸扣数 | 公扣小头 直径/MM | 母扣台肩内径/MM |
2A11×2A10 | NC26=2 3/8"IF | 4 | 60.35 | 74.61 |
211×210 | NC31=2 7/8'IF | 4 | 71.31 | 87.71 |
311×310 | NC38=3 1/2"IF | 4 | 85.06 | 103.58 |
NC40=4"FH | 4 | 89.06 | 110.33 | |
NC44 | 4 | 98.42 | 119.06 | |
4A11×4A10 | NC46=4"IF | 4 | 103.73 | 124.61 |
411×410 | NC50=4 1/2"IF | 4 | 114.30 | 134.91 |
NC56 | 117.50 | 150.81 | ||
NC61 | 4 | 126.60 | 165.10 | |
NC70 | 4 | 147.65 | 187.33 | |
NC77 | 4 | 161.85 | 204.79 | |
2A31×2A30 | 2 3/8"REG | 5 | 47.62 | 68.20 |
231×230 | 2 7/8"REG | 5 | 53.97 | 77.78 |
331×330 | 3 1/2"REG | 5 | 65.07 | 90.48 |
431×430 | 4 1/2"REG | 5 | 90.47 | 119.06 |
531×530 | 5 1/2"REG | 4 | 110.06 | 141.68 |
631×630 | 6 5/8"REG | 4 | 131.03 | 153.99 |
731×730 | 7 5/8"REG | 4 | 144.47 | 180.18 |
831×830 | 8 5/8"REG | 4 | 167.84 | 204.39 |
321×320 | 3 1/2"FH | 5 | 77.62 | 102.79 |
4"FH=NC40 | 4 | 89.66 | 110.33 | |
421×420 | 4 1/2"FH | 5 | 96.31 | 123.83 |
521×520 | 5 1/2"FH | 4 | 126.79 | 150.02 |
621×620 | 6 5/8"FH | 4 | 150.37 | 173.83 |
211×210 | 2 3/8"IF=NC26 | 4 | 60.35 | 74.61 |
211×210 | 2 7/8"IF=NC31 | 4 | 71.31 | 87.71 |
311×310 | 3 1/2"IF=NC38 | 4 | 85.06 | 103.58 |
4A11×4A10 | 4"IF=NC46 | 4 | 103.73 | 124.61 |
411×410 | 4 1/2"IF=NC50 | 4 | 114.30 | 134.91 |
511×510 | 5 1/2"IF | 4 | 141.32 | 163.91 |
注意： | ||||
1. 某些NC型接头可以与FH、IF型接头互换。 | ||||
2. 国内的接头加工尺寸与API标准不完全一致，略有误差。 | ||||
3. IF=inetrnal flush 内平扣 | ||||
FH=full hole 贯眼扣 | ||||
REG=regular 正规扣 | ||||