# Helical gear, normal module 1.5, 16 teeth, helix 45° right hand, face 12, Ø6 bore

> What are the dimensions of a 16-tooth, 45° helical gear?

- Category: Hardware › Mechanism parts
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/ · JSON: https://xemstudio.com/api/geometry?object=crossed-helical-gear-mn1-5-16t-beta45-rh-bore6 · Plain text: https://xemstudio.com/objects/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 36.94 | 36.94 | 12.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Normal module 1.5, helix angle 45°: transverse module 2.12, transverse pressure angle 27.24°, pitch Ø33.94, tip Ø36.94, root Ø30.19; addendum 1.5, dedendum 1.88 (normal-module depths).
- The transverse involute is twisted 40.51° over the 12 mm face; two of the same hand mesh on shafts crossed at 2 × 45°.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| normal module | 1.5 |
| teeth | 16 |
| helix angle | 45° RH |
| transverse module | 2.12 |
| pitch Ø | 33.94 mm |
| tip Ø | 36.94 mm |
| face | 12 mm |
| bore | Ø6 |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 43: figure, his text and an animation](https://507movements.com/mm_043.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/crossed-helical-gears-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/index.json · license: https://xemstudio.com/files/hardware/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/LICENSE.md

- crossed-helical-gear-mn1-5-16t-beta45-rh-bore6: [STEP](https://xemstudio.com/files/hardware/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6.step) · [STL](https://xemstudio.com/files/hardware/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6/crossed-helical-gear-mn1-5-16t-beta45-rh-bore6.stl) — gear, axis Z, z 0..12, a tooth on +X at z = 0

## Questions

**What are the dimensions of a 16-tooth, 45° helical gear?**

Normal module 1.5, helix angle 45°: transverse module 2.12, transverse pressure angle 27.24°, pitch Ø33.94, tip Ø36.94, root Ø30.19; addendum 1.5, dedendum 1.88 (normal-module depths).

## Fits with

- [Crossed helical (spiral) gears on shafts at 90°, 16 : 16](https://xemstudio.com/objects/crossed-helical-gears-mechanism/)