Thread Calculator
Calculate thread dimensions for Unified (UN) and Metric (M) threads. Find major diameter, minor diameter, pitch diameter, and more.
Common Thread Standards
UNC (Coarse)1/4-20, 3/8-16
UNF (Fine)1/4-28, 3/8-24
Metric CoarseM6×1, M10×1.5
Metric FineM6×0.75, M10×1.25
UNEF (Extra Fine)1/4-32, 3/8-32
🔩 Thread Formulas:
Pitch: 1/TPI (UN) • Major Dia: Nominal Size • Pitch Dia: Major - 0.6495 × Pitch • Minor Dia: Major - 1.0825 × Pitch • UN: D = D - 1.0825P, d = D - 1.0825P
Pitch: 1/TPI (UN) • Major Dia: Nominal Size • Pitch Dia: Major - 0.6495 × Pitch • Minor Dia: Major - 1.0825 × Pitch • UN: D = D - 1.0825P, d = D - 1.0825P
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Thread Analysis
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Step-by-Step Calculation
Detailed thread analysis
Major Dia
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in
Pitch Dia
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in
Minor Dia
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in
Thread Class
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Thread Specifications
Complete thread dimensions
Formula Reference
Thread formulas
Thread Tips
Understanding thread dimensions
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Engineering Disclaimer: Thread calculations are for standard Unified and Metric threads. Always verify with thread gauges and standards. Results are for educational purposes.