GB 国标
GB 5650 扩口式管接头空心螺栓Flared type tube fittings Inverted flare bolts
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DIN 德标
3870-2001 非钎焊和钎焊压合接头.管接螺母系列LL(3870-2001 | 代替 DIN 3870-1985;DIN 3870-19)
Non-soldering and soldering compression fittings - Union nuts series LL
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