ISO 9001:2015 Certified Manufacturing
Metric Thread Profile Calculator
Analyze Bolt and Nut Geometry for ISO Metric Thread Systems
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24/7
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Calculators & Converters
Mastering Thread Geometry
Standard metric threads rely on a symmetric V-profile with a 60-degree flank angle. Getting these dimensions right is the difference between a high-performance assembly and a stripped fastener. When you calculate a thread profile, you are defining exactly how the male and female components will interact under load.
By determining the precise major, minor, and pitch diameters, you can ensure your designs provide maximum engagement and resist loosening from vibration. This data is essential for choosing the right drill bits, taps, and machining offsets.
ISO Thread Basics
Flank Angle: 60°
Pitch (P): Distance between thread crests.
Height (H): Theoretical depth of a sharp V-thread.
Interactive Thread Profile Tool
Enter your nominal diameter and pitch below to generate the full geometry for your internal or external thread. Use these values to set up your manufacturing specs or quality inspections.
Metric Thread Profile Calculator
Calculate ISO metric thread dimensions including major, pitch, and minor diameters.
Pitch Diameter (d₂ / D₂)
Millimeters
Major Dia (d)
10.000
Minor Dia (d₃)
8.160
Minor Dia (D₁)
8.376
Tap Drill (approx)
8.50
Thread Height (H)
0.0000
*Based on ISO 68-1 basic profile. Dimensions shown are theoretical basic sizes.
Actual parts require tolerances (e.g., 6g/6H) for fit.
Core Thread Dimensions
| Dimension | Engineering Definition | Impact on Fit |
|---|---|---|
| Major Diameter | The outside diameter of the crest for external threads. | Determines basic size. |
| Pitch Diameter | The theoretical point where thread and groove widths are equal. | Controls thread "play." |
| Minor Diameter | The smallest diameter at the root of the thread. | Critical for drill sizing. |
| Thread Depth | The distance from the crest to the root. | Affects shear strength. |
Related Calculators
More free tools for the same job:
- Tap Drill Size Calculator: Find the tap drill size before tapping a thread.
- Thread Engagement Length Calculator: Find the minimum thread engagement for blind and through holes.
- Pilot Hole Design for Metric Thread Formers: Size the pilot hole for metric thread-forming screws.
- Metric-Inch Fastener Converter: Match metric and inch fastener sizes by thread type and diameter.
Need a Special Thread Design?
Our engineers can help you design custom thread profiles for high-stress applications or unique material requirements.