Whitworth fine threads

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Cutting TapsRoll (Forming) Taps Whitworth Threads Standard (Screw Threads, Center Holes)

This time, we received an order for a work drawing indicating a "25 W 14" thread in the screw symbol. Can you please tell me what kind of screw thread is this?

Your drawing is showing a screw thread called a Whitworth fine thread series. Your thread will have a nominal diameter of 25mm and the number of threads are 14 in a 25.4mm length. The threads included angle is 55 degrees. The thread pitch is 25.4 mm ÷ 14 = 1.814 mm

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