公制螺紋基本尺寸計算器
Calculate nominal pitch, basic pitch diameter and basic internal and external minor diameters for 60-degree ISO metric threads.
結果是根據上述輸入參數計算得出的；範例數值僅供說明之用，並非針對特定工具的速度／進給建議。.
公式與計算方法
ISO basic dimensions: d2 = D2 = d − 0.649519P; D1 = d − 1.082532P; d3 = d − 1.226869P.
These are theoretical profile dimensions for ISO general-purpose metric screw threads under ISO 724:2023, not production acceptance limits. The basic pitch diameter is shared by internal and external design profiles. Internal and external minor diameters differ because their root and crest geometries differ.
重要假設與限制
Does not calculate ISO 965 tolerance classes (such as 6H/6g), coating allowances, wire measurement or actual tap-drill tolerances. Use the standard and gauges for inspection and machining decisions.
常見問題
Are these 6H or 6g limit dimensions?
No. They are basic profile dimensions with no tolerance-zone deviations.
Why are the internal and external minor diameters different?
The ISO basic internal and external thread profiles have different root and crest truncations.
技術參考資料： ISO 724:2023 — Metric Thread Basic Dimensions. 針對 ONMY 的計算是獨立進行的；來源連結並不代表任何背書。.
