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Metric thread calculator to calculate external and internal metric thread dimensions including major diameter, minor diameter, pitch diameter and thread tolerance according to ISO 724 and ISO 965 standards. There are two calculation options available, general engineering use or custom use.
The below charts show all the possible thread size combinations of diameters/pitch as defined in ISO-261 MC – Metric Coarse Thread Series MF – Metric Fine Thread Series
THREAD DATA CHART: Metric Thread -- Fine Pitch. Nominal Size ISO MF. Thread Form Type. Major Diameter mm d=D. Pitch mm p. Root Radius mm r. Pitch Diameter mm d2=D2. Minor Diameter Male Thd. d3. Minor Diameter Female Thd.
ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68. The pitch varies from coarse to extra fine with up to 5 different pitches for some dimensions. The thread angle is 60 o and the thread depth is 0.614 x pitch.
Find out the different cross-sectional dimensions of any metric bolt's external thread and nut's internal thread using this thread calculator, given the thread pitch, basic major diameter, and tolerance class details of the threads.
Count the threads: Tally the number of complete threads within the measured length. Apply the formula: Metric: Pitch = Measured length / Number of threads. Imperial: TPI = Number of threads / Measured length (in inches) Measure 10 complete threads on a bolt, spanning 15 mm. Pitch = 15 mm / 10 = 1.5 mm.
The ThreaDoctor is an advanced online thread calculator. It uses an advanced algorithm for precise calculations of thread data. Please read the below manual to use it in the best possible way! Table of Contents. Units of Measurement. Colors. Supported thread Standards. Navigation. Tab #1- Nominal thread parameters. Tab #2 – Allowance and Tolerances
