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ISO 228-1:2000 (EN) Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances, and designation
ISO 228-1:2000 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings, Subcommittee SC 5, Threaded or plain end butt-welding fittings, threads, gauging of threads.
This fourth revision canceled and replaced the third edition (ISO 228-1:1994), which has been revised technically.
ISO 228:20000 consists of the following parts, under the general title Pipe threads where pressure-tight joints are not made on the threads:
— Part 1: Dimensions, tolerances, and designation
— Part 2: Verification by means of limit gauges
ISO 228:2000 specifies the requirements for thread form, dimensions, tolerances, and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads, intended for the mechanical assembly of the component parts of fittings, cocks, valves, accessories, etc.
These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies with such threads must be made pressure-tight, this should be affected by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal.
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