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| 51. | right-hand screw rule |
| 右手螺旋律 |
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| 52. | spiro ring system |
| 螺环系 |
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| 53. | head slotting machine |
| 螺钉帽开槽机 |
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| 54. | spiral welding steel pipe |
| 螺焊钢管 |
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| 55. | connecting socket |
| 接头螺孔 |
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| 56. | screwed pipe joint |
| 螺管联接 |
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| 57. | screw nicking machine |
| 螺钉头开槽机 |
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| 58. | spiral welded tube |
| 螺盘管 |
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| 59. | screw plug fuse |
| 螺塞熔断器 |
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| 60. | Spirillum anserum |
| 鹅螺菌 |
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