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	- Tabla de dimensiones y diámetros de mechas en milímetros para machos de roscar.
	- Conversión de pulgadas a milímetros. - Paso en hilos por puntada para cada sistema de rosca. (Diámetro en pulgadas). - Tablas para roscar. Roscas inglesas 55º / Roscas americanas 60º