In four start thread screw, if lead is 16 mm, then pitch is _______.

Concept:

Lead:

• Lead is the distance a threaded component moves along the matching component during one complete revolution. For a single start thread, the lead is equal to the pitch.

Single-start thread:

• A single-start thread has one continuous thread running along the body of the screw. They are usually cheap and commonly used.
• For a single start thread, the lead is equal to the pitch

Multi-start thread:

• A multi-start thread consists of two or more intertwined running parallel to one another.
• The lead distance of a double start thread is twice that of the single start thread and a triple start thread has thrice that of the single start thread.

​For four start thread:

Lead = 4 × Pitch

• Multi-start threads maintain a shallow thread depth relative to their longer lead distance. Another design advantage of a multi-start thread is that more contact surface is engaged in a single thread rotation.

Calculation:

Given:

Lead = 16 mm

∴ Lead  = 4 × Pitch

⇒ Pitch = Lead / 4 = 4 mm