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Showing posts from 2015

Pre-Plate pitch diameters, major diameters, and minor diameters of thread rings, thread plugs, and plug gauges.

The rules for determining Pre-Plate pitch diameters, major diameters, and minor diameters of thread rings, thread plugs, and plug  gauges are as follows: To determine  Pre-Plating  dimensions for external threaded parts:  For external threads subtract the max plating thickness from the high limit Pitch Diameter, and then subtract the minimum plating from the low limit Pitch Diameter   For the minor and major diameters reduce the maximum diameters by half the maximum plating and reduce minimum diameter by half the minimum plating.    To determine  Pre-Plating  dimensions for internal threaded parts:  For internal threads add the max plating thickness to the low limit of the Pitch Diameter, and then add the minimum plating thickness to the high limit of the Pitch Diameter.  For minor and major diameters increase the minimum minor diameters by half the maximum plating and in

Number of turns on the thread gauge

Calculating the number of turns on the thread gauge for the thread Size M10 x 1-6H. The number of turns on thread gauge: Length of threads: 0.402 ± .015: A length without threads is 0.158- Not given on the picture, and the diameter of countersink is 0.435 / 0.437 x 90° Thread Size: M10 x 1-6H I. Minimum of turns a) Convert the pitch: 1 / 25.4= 0.03937” b) Minimum of turns: 1) Calculating first the threaded material length when the 0.402” dimension is on the minimum of its tolerance and the 0.158” dimension is in on the maximum of its tolerance: L1 = (0402 - 0.015) - (0.158+.004)=0.225” 2) Calculating the length without threads. From the dimension of countersink 0.435 / 0.439. Nominal diameter of countersink is 0.437 From the dimension of the M10-1, the max diameter for internal threads is 10 mm-converted in inch 0.393”. 3) Calculating: Minimum full length thread=L1-H=0.225 - 0.022= 0.203 Number of turns for the minimum full threads length: 0.203 / 0.0393=5.1