We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A number giving the distance across the flats.
Also known as: Across flats size, Wrench size
A spanner's number is the distance across the flats of the fastener it fits, not the bolt's thread diameter. A metric M10 bolt commonly takes a seventeen millimetre spanner, so the two numbers on a job are unrelated.
States the distance across the flats of the nut or bolt head a spanner fits, in millimetres or inches.
Contexts: Technical drawing
Is unrelated to the fastener's thread size, so an M10 bolt takes a seventeen millimetre spanner and neither number predicts the other.
Contexts: Technical drawing
A numeral stamped into the shaft of a spanner, sometimes with a second numeral for the other end.