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A marked callout permitting statistical rather than worst-case control.
Also known as: ST symbol, Statistical tolerancing marking
The statistical tolerance symbol allows a tolerance to be satisfied by controlling the process distribution rather than by inspecting every part against a worst-case limit. It permits wider individual tolerances and depends entirely on the process actually being in control.
Permits a tolerance to be met by statistical process control rather than by worst-case assembly analysis.
Contexts: Technical drawing
Depends on the process being demonstrably in control, since the wider individual tolerances it allows are only safe if the distribution is what was assumed.
Contexts: Technical drawing
A symbol of a hexagonal outline containing the letters ST, placed after a tolerance value in a frame.