Millimeters to threads per centimeter
Type a value in mm to get it in threads/cm instantly.
0.5threads/cm
That's 6.7× as coarse as a coarse structural thread — nothing on our list beats it. Ten millimeters of travel takes about 0.5 turns.
What it means
How coarse is that thread?
Pitch is only half the story: a thread also has a diameter and a flank angle. Metric threads use 60°, as do Unified threads, but British Whitworth uses 55°, so they never interchange.
The math
How to convert mm to threads/cm
Threads per centimeter is the reciprocal of the pitch measured in centimeters: threads/cm = 10 ÷ pitch in mm.
Example: 20 mm = 0.5 threads/cm.
Every unit
Your pitch in every unit
Tables
mm to threads/cm conversion table
| mm | threads/cm |
|---|---|
| 4 mm | 2.5 threads/cm |
| 6 mm | 1.66667 threads/cm |
| 8 mm | 1.25 threads/cm |
| 10 mm | 1 threads/cm |
| 11 mm | 0.909091 threads/cm |
| 13 mm | 0.769231 threads/cm |
| 14 mm | 0.714286 threads/cm |
| 16 mm | 0.625 threads/cm |
| 18 mm | 0.555556 threads/cm |
| 20 mm | 0.5 threads/cm |
| 24 mm | 0.416667 threads/cm |
| 28 mm | 0.357143 threads/cm |
| 32 mm | 0.3125 threads/cm |
| 40 mm | 0.25 threads/cm |
threads/cm to mm conversion table
| threads/cm | mm |
|---|---|
| 4 threads/cm | 2.5 mm |
| 6 threads/cm | 1.66667 mm |
| 8 threads/cm | 1.25 mm |
| 10 threads/cm | 1 mm |
| 11 threads/cm | 0.909091 mm |
| 13 threads/cm | 0.769231 mm |
| 14 threads/cm | 0.714286 mm |
| 16 threads/cm | 0.625 mm |
| 18 threads/cm | 0.555556 mm |
| 20 threads/cm | 0.5 mm |
| 24 threads/cm | 0.416667 mm |
| 28 threads/cm | 0.357143 mm |
| 32 threads/cm | 0.3125 mm |
| 40 threads/cm | 0.25 mm |
Quick answers
Quick answers
- How many threads/cm is 1 mm?
- 1 mm is 10 threads/cm.
- How many threads/cm is 10 mm?
- 10 mm is 1 threads/cm.
- How many threads/cm is 20 mm?
- 20 mm is 0.5 threads/cm.
The units
About these units
Millimeters (mm)
The metric pitch: how far a bolt advances in one turn.
Threads per centimeter (threads/cm)
A rarely used metric counterpart to TPI.
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