The free Keyway & Parallel Key Size Chart and Torque
Find the parallel key size (b × h), shaft and hub keyway depths t1 and t2 for any shaft diameter per DIN 6885 / ISO 773 and check key shear and bearing.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
Illustration. Open the tool for the real thing.
What is the Keyway & Parallel Key Size Chart and Torque?
Machining or modelling a keyed shaft needs four numbers: key width, key height, the depth of the keyway in the shaft and in the hub. Enter the shaft diameter and this tool returns the standard parallel key (for example 8 × 7 mm on a 25 mm shaft), keyway depths t1 and t2, the depth from the opposite shaft surface to the groove bottom, a recommended standard key length and a corner radius range.
Add key length, torque and the key material's yield strength to see the torque the key can carry in shear and side bearing with your safety factor, and the utilisation of your load. A full chart for 6–170 mm shafts is included.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
DIN 6885-1 / ISO 773 for 6–170 mm shafts.
t1 shaft, t2 hub, plus groove bottom dimensions.
Shear and bearing limits with safety factor.
All size ranges with recommended lengths.
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It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This engineering calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Which standard is this?
DIN 6885-1 / ISO 773.
What is the shear strength?
Taken as 0.577 × yield.
Is it valid for tapered keys?
No, only parallel keys.
What about inches?
Convert to millimetres first.
How do I use the Keyway & Parallel Key Size Chart and Torque?
1. Enter the shaft diameter. 2. Read the key size and depths. 3. Optionally add torque, length and material. 4. Check utilisation.
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Try the Keyway & Parallel Key Size Chart and Torque now
Look up key width, height and keyway depths for any shaft diameter and check the torque. Free to use.
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