Building a thread reference board for a mixed-fleet workshop

A thread reference board is the cheapest fix available for a workshop that identifies the same parts every month. Every workshop that runs a mixed fleet ends up identifying the same handful of threads over and over, usually under pressure, usually by a different person each time. A reference board fixes that for the price of an afternoon and a sheet of plywood, and it is the single cheapest improvement most of the workshops we supply could make.

Samples, not pictures. A person identifying a fitting wants to offer the part up to a known one and see whether the nut starts, whether the seats match, whether the hex is the same. Mount both halves where you can — a male and its mating female — because half the identification problems in a workshop are about a port rather than a hose end.

Three lines per sample. The thread as measured. The seat. And where it came from — "boom cylinder, the yellow loader" — because that last line is what makes the board useful to someone ordering a part rather than only to someone identifying one. Write on the board itself, not on tape that will fall off in the heat.

Then photograph it, in good light, straight on, and keep that photograph where whoever raises orders can find it. A supplier receiving that image with an order has your entire fleet convention in one file, and the conversation about what you mean by "the usual" stops happening.

Add to it when a new machine arrives, and take something off when the last machine using it leaves the yard. A board that has grown for ten years and been pruned never is a museum: it holds families nobody runs any more, and it teaches new fitters that anything is possible, which is the opposite of what it is for.