BS 1387 銲接平口、絞牙鋼管. 鑫陽規格BSA, BSB級黑鋼管、後熱浸鍍鋅銲接鋼管及預熱浸鍍鋅銲接鋼管. (mm) END:1.5" & under plain square cut ends. 2" & above bevelled ...
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