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This data instance is about a grooved pin with one groove. The idea of a grooved pin is that is has two or more grooves usually which compress when the pin is inserted with force into a preformed hole, in this case a 'bush'. They are meant to not move. So there is a risk if the groove number is wrong as this part could slip due to a lack of friction in the linkage. At a semantic level is that we want a firm mechanical linkage and there fore therefore want to use the correct part - would we discover that a grooved pin is a firm linkage if we looked it up in mechanical engineering textbooks? This is what the semantic appeal will attempt to address.
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