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Common Thread Angles:

Thread Terminology

  • Major Diameter: Largest diameter of the thread
  • Minor Diameter: Smallest diameter of the thread
  • Pitch Diameter: Effective diameter where thread width equals space width
  • Thread Depth: Distance between major and minor diameters
  • Pitch: Distance between adjacent thread crests
  • TPI: Threads per inch (inverse of pitch)

Common Standards

  • Metric (ISO): 60° thread angle, pitch in mm (M6, M8, M10)
  • UNC: Unified National Coarse, coarse threads for general use
  • UNF: Unified National Fine, fine threads for precision
  • NPT: National Pipe Taper, tapered threads for pipes
  • BSW: British Standard Whitworth, 55° thread angle
  • ACME: 29° thread angle, used for power transmission

Applications

  • Fastening: Bolts, screws, nuts for assembly
  • Power Transmission: Lead screws, jack screws
  • Precision: Instrumentation, aerospace, medical
  • Piping: Fluid transfer, hydraulic systems
  • Automotive: Engine components, suspension
  • Construction: Structural connections

Why Use Our Thread Calculator?

Accurate Calculations

Precise thread dimension calculations based on international standards and formulas.

Visual Representation

Interactive thread diagrams showing all dimensions with color-coded indicators.

Tolerance Analysis

Calculate tolerance limits for different thread classes and applications.

Comprehensive Database

Pre-loaded with common thread sizes and standards for quick selection.

Unit Conversion

Switch between metric and imperial units with automatic conversion.

Export Results

Save and export your thread calculations for documentation and sharing.