Our handy thread pitch calculator helps determine the spacing between threads on screws, bolts, and nuts. By accurately measuring thread pitch, users can ensure proper fit and compatibility between threaded components.
Thread pitch is often expressed in different units, depending on the measurement system:
- Metric: measured in millimeters (mm)
- Imperial: measured in threads per inch (TPI)
The calculator facilitates conversions between these systems. For example:
- 1 mm pitch ≈ 25.4 TPI
- 20 TPI ≈ 1.27 mm pitch
Thread Pitch Calculator
| Thread Specification | System | Pitch Calculation | Result |
|---|---|---|---|
| M10 x 1.5 | Metric | Direct measurement | 1.5 mm |
| 1/4″-20 UNC | Imperial | 1 ÷ 20 | 0.05 in |
| M8 x 1.25 | Metric | Direct measurement | 1.25 mm |
| 3/8″-16 UNC | Imperial | 1 ÷ 16 | 0.0625 in |
| M12 x 1.75 | Metric | Direct measurement | 1.75 mm |
| M6 x 1.0 | Metric | Direct measurement | 1.0 mm |
| 5/16″-18 UNC | Imperial | 1 ÷ 18 | 0.0556 in |
| M14 x 2.0 | Metric | Direct measurement | 2.0 mm |
| 3/4″-10 UNC | Imperial | 1 ÷ 10 | 0.1 in |
| M30 x 3.0 | Metric | Direct measurement | 3.0 mm |
| M20 x 2.5 | Metric | Direct measurement | 2.5 mm |
| 1/2″-13 UNC | Imperial | 1 ÷ 13 | 0.0769 in |
| M16 x 2.0 | Metric | Direct measurement | 2.0 mm |
| #10-24 UNF | Imperial | 1 ÷ 24 | 0.0417 in |
| M18 x 2.5 | Metric | Direct measurement | 2.5 mm |
Thread Pitch Formula
The formula for calculating thread pitch varies based on the measurement system:
Metric System: Pitch (P) = Distance between adjacent thread crestsImperial System: Pitch (P) = 1 / Threads per inch (TPI)For metric to imperial conversion:
TPI = 25.4 / Pitch (mm)For imperial to metric conversion:
Pitch (mm) = 25.4 / TPIA bolt has 16 threads per inch. Calculate its metric pitch.
- Pitch = 25.4 / 16 = 1.5875 mm
How to Calculate Thread Pitch?
Calculating thread pitch involves these steps:
- Choose a measurement system: Decide whether to work in metric or imperial units.
- Measure the thread length: For accuracy, measure across multiple threads.
- Count the threads: Tally the number of complete threads within the measured length.
- Apply the formula:
- Metric: Pitch = Measured length / Number of threads
- Imperial: TPI = Number of threads / Measured length (in inches)
Measure 10 complete threads on a bolt, spanning 15 mm.
Pitch = 15 mm / 10 = 1.5 mm
This bolt has a 1.5 mm pitch.
What Does 1.5 Thread Pitch Mean?
A 1.5 thread pitch indicates that the distance between adjacent thread crests is 1.5 mm in the metric system.
This specification is crucial for:
- Identifying compatible nuts and threaded holes
- Selecting appropriate taps and dies for thread creation
- Ensuring proper engagement and load distribution
In imperial measurements, a 1.5 mm pitch equates to approximately 16.93 TPI (25.4 / 1.5).
A machine requires a bolt with a 1.5 mm pitch. This information helps in:
- Sourcing the correct fastener
- Preparing mating threads in the machine’s body
- Selecting suitable tools for installation or maintenance
What is Thread Pitch?
Thread pitch is the fundamental measurement in threaded fasteners that represents the parallel distance between adjacent thread crests (peaks) measured along the thread’s axis. It’s a critical parameter that determines both the functional characteristics and compatibility of threaded components.
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