Bolt Size & Torque
Calculate stress area and preload from nominal diameter, pitch, and grade.
Calculates raw module from pitch diameter and tooth count, then suggests nearest standard module and recommended diameter.
Enter pitch diameter (d) and tooth count (z), calculate raw module, and see nearest standard module with recommended diameter.
Schematic view based on pitch diameter and tooth count.
PNG export is report-ready.
Recommendation subset from the ISO 54 module series: 0.5, 0.6, 0.8, 1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 20. It is shown separately from raw m=d/z. The z<17 warning is only an approximate pre-check for a 20° standard full-depth external gear with no profile shift. ISO 54:1996
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