BS 21(1985) : 1985被替代
SPECIFICATION FOR PIPE THREADS FOR TUBES AND FITTINGS WHERE PRESSURE-TIGHT JOINTS ARE MADE ON THE THREADS (METRIC DIMENSIONS)
出版：British Standards Institution
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基本信息
标准编号： BS 21(1985) : 1985
发布时间：1985/1/1 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：22
标准简介
Describes jointing pipe threads and longscrew pipe threads. Covers definitions, symbols, basic forms of pipe threads, recommended gauging systems for jointing threads, methods of verification of jointing thread dimensions and special parallel external threads for gas appliances where pressure-tight seals are made on machined faces.
本标准替代的旧标准
