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Key at shaft Ø

Shaft Ø in whole mm, DIN 6885-1 (upper bound inclusive; Ø 6 mm falls just outside the first row).

Shaft Ø (mm)

Shaft Ø 20 mm · >17 – ≤22

Key b × h: 6 × 6 mm
t₁ shaft: 3,5 mm
t₂ hub: 2,8 mm
Depth tolerance: 0 / +0,1 mm

DIN 6885-A 6×6×L

t1 3,5 / t2 2,8 mm · 0/+0,1 mm

CURRENT STANDARD · TABLE LOOKUP

Validity: Shaft Ø >6-110 mm, tall (high) form; DIN 6885-2 (low form) not covered

Assumptions: Geometry only — does not size transmitted torque, key length or contact pressure. H9/D10 sliding label is a shop/UNI convention, not the named fit in the 2021 text.

Source details

DIN 6885-1:2021 (Elesa+Ganter transcription)

Checked 2026-09-17

Technical diagram · dimensions in mm · schematic, not to scale

Key and groove depth (DIN 6885-1)

Shaft Ø d (mm)	Key b × h	t₁ shaft	t₂ hub	Depth tol.
>6 – ≤8	2 × 2	1,2	1,0	0 / +0,1
>8 – ≤10	3 × 3	1,8	1,4	0 / +0,1
>10 – ≤12	4 × 4	2,5	1,8	0 / +0,1
>12 – ≤17	5 × 5	3,0	2,3	0 / +0,1
>17 – ≤22	6 × 6	3,5	2,8	0 / +0,1
>22 – ≤30	8 × 7	4,0	3,3	0 / +0,2
>30 – ≤38	10 × 8	5,0	3,3	0 / +0,2
>38 – ≤44	12 × 8	5,0	3,3	0 / +0,2
>44 – ≤50	14 × 9	5,5	3,8	0 / +0,2
>50 – ≤58	16 × 10	6,0	4,3	0 / +0,2
>58 – ≤65	18 × 11	7,0	4,4	0 / +0,2
>65 – ≤75	20 × 12	7,5	4,9	0 / +0,2
>75 – ≤85	22 × 14	9,0	5,4	0 / +0,2
>85 – ≤95	25 × 14	9,0	5,4	0 / +0,2
>95 – ≤110	28 × 16	10,0	6,4	0 / +0,2

Source: Elesa+Ganter — DIN 6885 keyways

Width tolerance b

P9 / P9 — fixed

Standard. Shaft and hub both P9. Key sits tight; suitable for variable loads.

N9 / JS9 — light

Shaft N9, hub JS9. Easier to assemble. Only where the application allows it.

H9 / D10 — sliding

Shop/UNI convention for sliding hubs. DIN 6885-1:2021 calls P9 close-fit and N9/JS9 free.

Class	Upper / lower deviation
P9	-0,012 / -0,042 mm
N9	+0,000 / -0,030 mm
JS9	+0,015 / -0,015 mm
H9	+0,030 / +0,000 mm
D10	+0,078 / +0,030 mm

For b = 6 mm (Ø 20 mm). Gap = hole basis, per ISO 286-2.

Source: Elesa+Ganter — DIN 6885 keyways

(tall form). DIN 6885-2 is the low form. H9/D10 is a shop/UNI convention, not the named sliding fit in DIN 6885-1:2021. Check critical dimensions in the current standard.

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Questions

What are t1 and t2 in DIN 6885?+

t₁ is groove depth in the shaft, t₂ in the hub. b × h is the key size.

Which width tolerance is standard?+

P9 in shaft and hub: tight fit (DIN 6885-1:2021). Easy fit is N9 (shaft) / JS9 (hub). H9/D10 is a shop/UNI convention.

Does Ø 6 mm belong in the table?+

No. DIN 6885-1: first row is above 6 mm through 8 mm. Exactly Ø 6 mm is outside.

Difference between DIN 6885-1 and 6885-2?+

DIN 6885-1 is the high type. DIN 6885-2 is the low type, with a different radial key position.

Keyway tolerances

Key at shaft Ø

Key and groove depth (DIN 6885-1)

Width tolerance b

Questions

Key at shaft Ø

Key and groove depth (DIN 6885-1)

Width tolerance b