| Standard Number | BS 21:1985 |
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| Title | Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions) |
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| Abstract | Range of threads from 1/16 to 6, together with thread forms, dimensions and tolerances, designations; includes appendices for recommended gauging systems and methods of use of gauges. Requirements for jointing threads for taper external threads, for assembly with either tapes or parallel internal threads and for longscrew threads for longscrews specified in BS 1387. |
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| Status | Confirmed, Current, Partially replaced |
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| Publication Date | 30 September 1985 |
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| Confirm Date | 01 March 2013 |
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| Cross References | BS 919:Part 2, BS 1387, BS 2779 |
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| Replaced By | BS EN 10226-1:2004, Partially replaced by BS EN 10226-1:2004. |
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| Replaces | BS 21:1973 |
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| International Relationships | ISO 7-1:1982 Equivalent, ISO 7-2:1982 Not Equivalent |
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| Amended By | AMD 6633 |
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| Supersedes Draft | 83/78475 DC |
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| Descriptors | Threads, Pipes, Parallel threads, Taper threads, External threads, Internal threads, Screwed fittings, Pipe fittings, Dimensions, Dimensional tolerances, Designations, Pressure pipes, Thread gauges, Longscrews, Gas-powered devices, Pipe couplings, Thread forms |
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| ICS | 21.040.10 (Metric screw threads)
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| Title in French | Filetages de tuyauterie pour raccordement dans le filet (dimensions métriques) - spécifications |
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| Title in German | Metrische Rohrgewinde fuer Rohre und Formstuecke fuer im Gewinde dichtende Verbindungen |
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| Committee | ISE/110 |
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| ISBN | 0 580 14556 5 |
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| Format | A4 |
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| Delivery | YES |
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| Pages | 20 |
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| Price | £ 100.00 |
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