ISO 3506-3:2009 applies to set screws and similar fasteners:
- with nominal thread diameter 1,6 mm ≤ d ≤ 24 mm;
- of triangular ISO metric threads with diameters and pitches in accordance with ISO 68-1, ISO 261 and ISO 262;
- of any shape.
It does not apply to screws with special properties, such as weldability.
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