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第二次世界大战前惠特沃思螺母和螺栓
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..
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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..
