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81. | straight-through joint |
| 直通式接头 |
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82. | oil tight joint |
| 油密接头 |
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83. | chute swivel joint |
| 管道铰接头 |
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84. | coarse-threaded joint |
| 粗纹接头 |
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85. | angle ball joint |
| 角弯接头 |
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86. | mechanical expansion joint |
| 机械膨胀接头 |
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87. | angle butt joint |
| 角度对接接头 |
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88. | secret dovetail joint |
| 暗榫接头 |
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89. | annular rotary joint |
| 环状旋转接头 |
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90. | circulation control joint |
| 可控循环接头 |
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