diameter pitchダイヤメトラルピッチ[機械]〈99B0102:歯車用語―幾何学的定義〉pitch diameter: ピッチ円直径◆【略】PDbasic pitch diameter: basic pitch diameter有効径の基準寸法[機械]〈96B0176:ねじ加工工具用語〉bolt with pitch diameter body: bolt with pitch diameter body有効径ボルト[機械]