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Metric 30° Trapezoidal Threads Measuring

Measured Pitch Diameter Over Wires:

How to calculate the thread pitch diameter of Metric 30 Degree Trapezoidal Threads using the 3 Wire Method.

#1

Determine the “Best Wire Size”

1) Multiply the Thread Pitch in Millimeters by .51764 ( 15° Secant ÷ 2 )

2) Multiply the Result in Step 1 by .03937

3) Round the Result from Step 2 to Desired Decimal Places = Best Wire Size

Thread Pitch in Millimeters

Best Wire Size ( Millimeters )

#2

Calculate the “Measurement Over the Wires”

1) Multiply the Thread Pitch in Millimeters by 1.866025 ( 15° Cotangent ÷ 2 )

2) Multiply the ( Best Wire Size ) by 4.8637 ( 1 + Cosecant 15° )

3) Subtract the Result from Step 1 from the Desired Pitch Diameter

4) Add the Result from Step 2 to the Desired Pitch Diameter = Measured Pitch Diameter Over Wires

As you can see the calculations for measuring Metric 30° Trapezoidal Threads using the 3 Wire Method can be cumbersome. Fortunately there is an easy way with the “ Metric 30° Trapezoidal 3 Wire Measuring Calculator “ included in the Web Machinist Software Program. (See Below)

With the “ Metric 30° 3 Wire Measuring Calculator “ included in the Web Machinist Software Program , you can quickly and easily calculate the Best Wire Size, the Measurement Over Wires for a Desired Pitch Diameter and the actual Pitch Diameter based on the Measurement Obtained over the Wires.

Trapezoidal Thread Measurements

Also included in the Web Machinist Software Program is “ Metric 30° Trapezoidal Threading Calculator “. With this calculator the dimensions for 30° Trapezoid Threads from TR8x1.5 to TR1120x44 in both External Threads and Internal Threads.

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