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Inch Gears — Metric and Inch Gear Compatibility from KHK USA

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KHK USA supports engineers and manufacturers converting from imperial diametral pitch (DP) gear standards to metric module (m) gear standards. While KHK USA specializes in metric gears, our free Module-to-DP Converter tool helps identify the closest metric module equivalent to any imperial DP specification.

Metric vs Inch Gear Standards

Metric gears use Module (m) as the fundamental size parameter, while imperial gears use Diametral Pitch (DP). The relationship is: m = 25.4 / DP. Common North American DP values (16, 20, 24, 32, 48, 64) have close metric module equivalents in the KHK catalog.

Conversion Support

KHK USA’s free Module-to-DP Converter provides instant bi-directional conversion, closest KHK module matches, and deviation percentages to help you specify the correct metric replacement.

Free Engineering Tools

4 Free AI-Powered Engineering Tools

Built exclusively by KHK USA. Not available from any other gear supplier. Click any tool to use it.

01
Compatibility
Gear Assembly Compatibility Checker
Validate that your gear set will mesh correctly before ordering. Get an instant engineering verdict with actionable recommendations.
  • Module & pressure angle match validation
  • Hunting tooth analysis
  • Center distance calculation
  • COMPATIBLE / WARNING / INCOMPATIBLE verdict
Use This Tool
02
Conversion
Module-to-DP Converter & Cross-Reference
Bi-directional conversion between metric Module and imperial Diametral Pitch with KHK standard module matches.
  • Instant bi-directional conversion
  • Closest KHK module matches with deviation %
  • Side-by-side dimensional comparison
  • 12 most common DP quick-reference grid
Use This Tool
03
Reference
Interactive Gear Glossary
Searchable reference of 40 gear engineering terms with definitions, formulas, and direct KHK product links.
  • Real-time keyword search with highlighting
  • 6 category filters — Geometry, Performance, etc.
  • Alphabetical navigation A–Z
  • Direct links to KHK products
Use This Tool
04
Calculator
Gear Torque & Load Calculator
Full Lewis bending stress analysis for gear tooth strength validation with animated safety factor verdict.
  • 9 KHK material options
  • Barth velocity factor equation
  • 8 result cards in metric + imperial
  • Automatic upgrade path recommendations
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FAQ

Frequently Asked Questions

In most cases, metric gears cannot directly replace inch DP gears without replacing both mating gears, as the tooth profiles are not interchangeable. The free Module-to-DP Converter helps identify the closest metric equivalent.

KHK USA specializes in metric module gears. For inch DP requirements, KHK can provide custom gear manufacturing to imperial specifications through the KHK USA custom gear program.

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Contact KHK USA

Ready to discuss your metric gear requirements? Our engineering team provides application assistance, custom quotations, and technical support.

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