qualifier token a chosen word

thread hand

also called right or left hand thread · thread direction

WHETHER A THREAD IS CUT RIGHT-HAND OR LEFT-HAND. A qualifier of `thread_size`, optional, because most threads are right-hand and most sheets say nothing. IT IS PUBLISHED BY TWO HOUSES ON TWO CONTINENTS AND IT IS NOT COSMETIC: Lemforder prints `Thread Type: with right-hand thread` on the tie rod end 18003 02 and writes `RHT` into the designation itself on other articles; MOOG prints `End 1 Thread Direction: Counterclockwise` on the ES800880. A steering tie rod is threaded one hand at each end SO THAT TURNING THE SLEEVE LENGTHENS IT - fit the wrong hand and the adjustment runs backwards - so a part that cannot state its hand cannot be matched to its pair. A qualifier and not a flat slot for the same reason as `thread_role`: one part carries two threads which may be of two different hands. Concern measurement.

Thread hand is answered with one word chosen from the thread directions list — the same word shared across every product that uses it.

It is a qualifier of thread size — it has meaning only inside a thread size statement, one per statement, never on its own. It belongs with thread size to measurement — its measurable, physical facts.

It is answered inside every thread size statement, not as a standalone question on a kind.

answered with: ◇token — a token — a word chosen from a fixed vocabulary, shared and filterable across products.
value domain: Thread directions — the vocabulary its answers are drawn from.
qualifier of: thread size — one per statement — it has meaning only inside that host's statement.

Answered inside every thread size statement — not a standalone slot on any kind.