You will need
  • - thread;
  • - the range;
  • - thread pitch gauge.
Thread pitch is called the distance between the homonymous lateral sides of thread profile. It should be measured for the correct determination of this characteristic. Do this roughly by using a regular ruler. Measure the length of a certain number of threads.
Keep in mind that the more turns will be measured, the less will be the error. So depending on thread sizes to measure counts from 10 to 20 turns. The length of the counted number of turns, measured with a ruler, divide by the number of such coils. This will be the thread pitch. Measure the length in millimeters better. In that case, if the thread pitch needs to be measured in inches, perform a translation of magnitude.
For example, if you want to measure step a certain thread count 20 coils to reduce the measurement error (if there is a number of turns, if not, take less). Assume that you will get a measurement of the thread length 127 mm. Divide that number by 20 turns, and get the 6.35 mm. Is the thread pitch in millimeters.
If you need to transfer it to inches, take the value of one inch in mm, which is 25.4, and divide the resulting pitch 6.35 mm to this value. In this case will be 0.25 or 1/4" (inch). If the value is not obtained so exact, round it to the nearest fraction of an inch.
Because the vast majority of threads is done according to approved standards in order to unify the connection, measure the thread pitch of ratibora. This device is a set of special steel plates that have cutouts corresponding to the different types of thread. On the plate deposited values corresponding to varying the step length in millimeters or fractions of an inch. Produce dimension, applying to the various threads of the plate parallel to the thread axis, and check the clearance between the teeth on the light. If he lost, the value on the plate is one which indicates the step of the measured thread.