ISO metric screw thread - Wikipedia. The ISO metric screw threads are the world- wide most commonly used type of general- purpose screw thread. ISO metric threads consist of a symmetric V- shaped thread. In the plane of the thread axis, the flanks of the V have an angle of 6. The thread depth is 0. This means that the external thread must end flat at Dmaj, but can be rounded out below the minor diameter Dmin. Conversely, in an internal (female) thread (e. Dmin but may be rounded out beyond Dmaj. The minor diameter Dmin and effective pitch diameter Dp are derived from the major diameter and pitch as. Dmin=Dmaj. If the pitch is the normally used . Tolerance classes defined in ISO 9. M5. 00. If, for instance, only M2. BS 3643 Part 1:2007.ISO metric screw threads. Principles and basic data. ISO general purpose metric screw threads. Tolerance selection Example. External threads are designated by lowercase letter, g or h. Internal threads are designated by upper case letters, G or H. In addition, one or two smaller . Superfine pitch metric threads are occasionally used in automotive components, such as suspension struts, and are commonly used in the aviation manufacturing industry. This is because extra fine threads are more resistant to coming loose from vibrations. Other (usually smaller) sizes may occur for reasons of weight and cost reduction. Thread. Hex headwidth (mm)M2. M2. 5. 5M3. 5. 5. M4. 7M5. 8M6. 10. M7. 11. M8. 13. M1. M1. 21. 9M1. 42. 2M1. M1. 82. 7M2. 03. 0M2. BS 3643, ISO metric screw threads. BS 3643-2, Specification for selected limits of size. BS 6104-1, Mechanical properties of fasteners — Part I: Bolts.BS 3643-2; shopping basket. BS 3643-2:2007-11-30 Title (german). ISO metric screw threads. Specification for selected limits of size. BS 3643-2:1981 ISO metric screw threads. ISO/DIS 4042: Replaced By: BS 3643-2:2007: Amended By: AMD 5094: Draft Superseded By: 81/70041 DC85/71584 DC: Descriptors. Publication Index / British Standards Institution / BS 3643-1:1981 ISO metric screw threads. Applies to single-start parallel screw threads having the ISO basic. M2. 43. 6M2. 74. 1M3. M3. 35. 0M3. 65. 5Standards. BS 3. 64. 3- 1 - 1. ISO Metric Screw Threads — Part 1 Principles And Basic Data ISO.
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