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| 51. | galvanized iron bolt |
| 镀锌铁螺栓 |
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| 52. | lag Bolt [screw] |
| 方头螺栓 |
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| 53. | bolted connection |
| 螺栓连接 |
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| 54. | conical head bolt |
| 锥头螺栓 |
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| 55. | bolted-on connection |
| 螺栓联结 |
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| 56. | galvanized bolt |
| 镀锌螺栓 |
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| 57. | a female plug |
| 母螺栓 |
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| 58. | press(ure) bolt |
| 压紧螺栓 |
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| 59. | high-strength bolt |
| 高强度螺栓 |
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| 60. | wingheaded bolt |
| 翼形螺栓 |
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