ピッチとは？　リードとは？ | オーエスジー

What is Pitch? What is a lead?

Pitch is the distance measured parallel to the axis between two points corresponding to adjacent chevrons in the shaft cross-section of the screw.

It is represented by P, and 1.5P refers to 1.5 pitches.

The lead is the distance between the beginning and end positions of the thread (parallel to the axis) when the thread is rotated, denoted by L.

・Screw terminology

P: Pitch A: minor diameter B: Effective diameter C: core diameter D: Outer diameter E: Angle of thread
internal thread (Nut)	external thread (Volt)

Effective diameter: The hypothetical diameter of the cylinder such that the width of the thread is equal to the width of the thread

- Difference between pitch and lead

Pitch: Distance from the neighboring mountain (parallel to the axis)

Lead: The distance between the beginning position and the end position when turning one revolution (parallel to the axis)

One-thread screw (general screw) When you rotate one wheel, it moves by one pitch	Two-threaded screws (two or more screws are collectively called multi-threaded screws) One rotation moves two pitches
In the case of a single thread, 1 pitch = 1 lead.	In the case of a two-threaded thread, 2 pitches = 1 lead.