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| 文档标题： | 第二次世界大战前惠特沃思螺母和螺栓 |
| 发布时间： | 2014-04-05 00:00:00 |
| 文档简介： | half inch shank hex head standard thread This standard 12 tpi compares to the 12 tpi on the one inch locomotive screw stay which as a bolt would have had 8 tpi.. |