VALICALC · TECHNICAL REFERENCE

Module ↔ Diametral Pitch Chart

Compare metric module and diametral pitch on one generated matrix. Nearby catalog values are shown as alternatives, not equivalent interchangeable gears.

SCENARIO MATRIX

Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.

SELECTED REFERENCE

Module 2

Module
2 mm
Diametral pitch
12.7 1/in
Circular pitch
6.283 mm
All fields & cell provenance
Comparison axis
Module example

v1.1.0 · verified 2026-10-06

Continue your workflow

Gear Module Calculator →Gear Pitch Diameter Calculator →

Module 22 mmBack to answer ↑

Explore the verified data

21 matching rows · 21 in this subset

Module ↔ Diametral Pitch Chart, metric display
Source designationModuleDiametral pitchCircular pitchActions
Module 0.50.5 mm50.8 1/in1.571 mm
48 DP0.529 mm48 1/in1.662 mm
32 DP0.794 mm32 1/in2.494 mm
Module 0.80.8 mm31.75 1/in2.513 mm
Module 11 mm25.4 1/in3.142 mm
24 DP1.058 mm24 1/in3.325 mm
Module 1.251.25 mm20.32 1/in3.927 mm
20 DP1.27 mm20 1/in3.99 mm
Module 1.51.5 mm16.933 1/in4.712 mm
16 DP1.588 mm16 1/in4.987 mm
Module 22 mm12.7 1/in6.283 mm
12 DP2.117 mm12 1/in6.65 mm
Module 2.52.5 mm10.16 1/in7.854 mm
10 DP2.54 mm10 1/in7.98 mm
Module 33 mm8.467 1/in9.425 mm
8 DP3.175 mm8 1/in9.975 mm
Module 44 mm6.35 1/in12.566 mm
Module 55 mm5.08 1/in15.708 mm
Module 66 mm4.233 1/in18.85 mm
Module 88 mm3.175 1/in25.133 mm

Module 0.5

Module
0.5 mm
Diametral pitch
50.8 1/in
Circular pitch
1.571 mm
More dimensions
Comparison axis
Module example

48 DP

Module
0.529 mm
Diametral pitch
48 1/in
Circular pitch
1.662 mm
More dimensions
Comparison axis
DP example

32 DP

Module
0.794 mm
Diametral pitch
32 1/in
Circular pitch
2.494 mm
More dimensions
Comparison axis
DP example

Module 0.8

Module
0.8 mm
Diametral pitch
31.75 1/in
Circular pitch
2.513 mm
More dimensions
Comparison axis
Module example

Module 1

Module
1 mm
Diametral pitch
25.4 1/in
Circular pitch
3.142 mm
More dimensions
Comparison axis
Module example

24 DP

Module
1.058 mm
Diametral pitch
24 1/in
Circular pitch
3.325 mm
More dimensions
Comparison axis
DP example

Module 1.25

Module
1.25 mm
Diametral pitch
20.32 1/in
Circular pitch
3.927 mm
More dimensions
Comparison axis
Module example

20 DP

Module
1.27 mm
Diametral pitch
20 1/in
Circular pitch
3.99 mm
More dimensions
Comparison axis
DP example

Module 1.5

Module
1.5 mm
Diametral pitch
16.933 1/in
Circular pitch
4.712 mm
More dimensions
Comparison axis
Module example

16 DP

Module
1.588 mm
Diametral pitch
16 1/in
Circular pitch
4.987 mm
More dimensions
Comparison axis
DP example

Module 2

Module
2 mm
Diametral pitch
12.7 1/in
Circular pitch
6.283 mm
More dimensions
Comparison axis
Module example

12 DP

Module
2.117 mm
Diametral pitch
12 1/in
Circular pitch
6.65 mm
More dimensions
Comparison axis
DP example

Module 2.5

Module
2.5 mm
Diametral pitch
10.16 1/in
Circular pitch
7.854 mm
More dimensions
Comparison axis
Module example

10 DP

Module
2.54 mm
Diametral pitch
10 1/in
Circular pitch
7.98 mm
More dimensions
Comparison axis
DP example

Module 3

Module
3 mm
Diametral pitch
8.467 1/in
Circular pitch
9.425 mm
More dimensions
Comparison axis
Module example

8 DP

Module
3.175 mm
Diametral pitch
8 1/in
Circular pitch
9.975 mm
More dimensions
Comparison axis
DP example

Module 4

Module
4 mm
Diametral pitch
6.35 1/in
Circular pitch
12.566 mm
More dimensions
Comparison axis
Module example

Module 5

Module
5 mm
Diametral pitch
5.08 1/in
Circular pitch
15.708 mm
More dimensions
Comparison axis
Module example

Module 6

Module
6 mm
Diametral pitch
4.233 1/in
Circular pitch
18.85 mm
More dimensions
Comparison axis
Module example

Module 8

Module
8 mm
Diametral pitch
3.175 1/in
Circular pitch
25.133 mm
More dimensions
Comparison axis
Module example

How to use this data

DP=25.4/m and m=25.4/DP. Keep unrounded reciprocal values for calculation; only displayed columns are rounded.

  • Module and DP designation units stay mm and 1/in. A display toggle converts physical circular pitch.

CHECK THE METHOD

Worked example

Module 2 is exactly 12.7DP;20DP is module 1.27. Module 1.25 is nearby but differs and is not the exact conversion.

Related calculators

CalculatorGear Module CalculatorCalculatorGear Pitch Diameter CalculatorCalculatorGear Circular Pitch Calculator

Continue the reference workflow

ReferenceGear Module ChartReferenceSpur Gear Dimensions Reference

Common lookup questions

Can I substitute a nearby module for a DP gear?

The numerical conversion alone does not establish mating tooth geometry. Pressure angle, tooth form and exact pitch must also match.

TRACEABLE DATA

Sources, scope & verification

Dataset v1.1.0
Last verified:

Generated reciprocal conversions for 13 module and eight DP examples; not a complete catalog standard.

Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.

KHK calculation of gear dimensions ↗

Type A · KHK · web revision not stated

Original equations and generated scenario values; no copied reference table.

Full provenance & artifact record
Source checked
2026-10-06
Use basis
authored-formula
Artifact SHA-256
55d5b5f18fe2559fc17ca1c1241b804602fd4eddd81a73dfe1b96b4c14d13ecf