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Minimum SVG feature size and kerf

Kerf is material removed along a cut. A minimum workable feature also depends on the material and process, so there is no universal safe value here.

Four different things to measure

FeatureWhat the measurement means
GapEmpty space between neighbouring contours
BridgeMaterial that connects two regions
Loose pieceAn isolated part that must survive handling
StrokeA visual line width; it may be treated as a centreline by software

Use a measured process threshold

The checker accepts your threshold and identifies a limited set of small primitive boxes and strokes. It leaves complex path features unknown.

Keep compensation separate

A kerf measurement made after compensation cannot be used as though it came from uncompensated geometry.