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ISO Metric Thread Dimensions

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The ISO Standardisation Authority defines strict specifications  metric threads.  This is to ensure compatibility with mating components.  The table below shows various dimensions and the required tap drill diameter of coarse and fine threads M1 through to M68.

Tolerances should be considered when designing products.  Values related to drilling and tapping can differ significantly depending on factors such as operating temperature and material.

Optimas are a full-service supply chain and manufacturing solutions provider.   Before you design your next product or make updates to an existing product, consider partnering with Optimas to take advantage of our many capabilities.

Metric Thread Drawing

All dimensions in millimeters (mm).  For guidance only.

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