3x3 Parallel Key (Feather Key), Form A, DIN 6885

The 3x3 parallel key (DIN 6885, form A): key width 3 mm, key height 3 mm, edge chamfer 0.16 to 0.25 mm. Available as 13 lengths from 6 to 36 mm, each as simplified STEP.

How these parts are made, and what the levels mean: read the method

• Also searched as: 3x3 key, 3x3 x 6 to 3x3 x 36 keys
• Model id: din6885-a-3x3
• Standard: DIN 6885:2021 · size 3x3

Lengths

Length (mm)	Part key	Simplified
6	din6885-a-3x3x6	STEP
8	din6885-a-3x3x8	STEP
10	din6885-a-3x3x10	STEP
12	din6885-a-3x3x12	STEP
14	din6885-a-3x3x14	STEP
16	din6885-a-3x3x16	STEP
18	din6885-a-3x3x18	STEP
20	din6885-a-3x3x20	STEP
22	din6885-a-3x3x22	STEP
25	din6885-a-3x3x25	STEP
28	din6885-a-3x3x28	STEP
32	din6885-a-3x3x32	STEP
36	din6885-a-3x3x36	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
b	Key width	2.975	3	3	2.9875	midpoint of min–max	L1
h	Key height	2.975	3	3	2.9875	midpoint of min–max	L1
s	Edge chamfer	0.16		0.25	0.205	midpoint of min–max	L1
d_shaft	Shaft diameter range	8		10	9	midpoint of min–max	L1
t1	Shaft keyway depth		1.8		1.8	nominal	L1
t2	Hub keyway depth		1.4		1.4	nominal	L1

Drawing

As a PDF: CC-DIN6885-SZ-3x3.pdf.

The 3x3 form A parallel key beside the 2x2 and the 4x4

The 3x3 is number 2 of the 5 DIN 6885 parallel keys published here, listed from 2x2 to 6x6.

• Key width (b): 3 mm on the 3x3 form A parallel key, against 2 mm on the 2x2 and 4 mm on the 4x4.
• Key height (h): 3 mm on the 3x3 form A parallel key, against 2 mm on the 2x2 and 4 mm on the 4x4.
• Edge chamfer (s): 0.16 to 0.25 mm on the 3x3 form A parallel key, the same on the 2x2 and the 4x4.
• Shaft diameter range (d_shaft): 8 to 10 mm on the 3x3 form A parallel key, against 6 to 8 mm on the 2x2 and 10 to 12 mm on the 4x4.
• Shaft keyway depth (t1): 1.8 mm on the 3x3 form A parallel key, against 1.2 mm on the 2x2 and 2.5 mm on the 4x4.
• Hub keyway depth (t2): 1.4 mm on the 3x3 form A parallel key, against 1 mm on the 2x2 and 1.8 mm on the 4x4.

The 3x3 form A parallel key in its other forms

• 3x3 Parallel Key (Feather Key), Form B, DIN 6885, with the same values.
• 3x3 Parallel Key (Feather Key), Form AB, DIN 6885, with the same values.

Other sizes

• One size smaller: 2x2 Parallel Key (Feather Key), Form A, DIN 6885.
• One size larger: 4x4 Parallel Key (Feather Key), Form A, DIN 6885.

Documents

• CC-DIN6885-DS-3x3.pdf: 3x3 datasheet: values with levels, lengths, sources
• CC-DIN6885-SZ-3x3.pdf: 3x3 drawing: this size's values on the views
• parts.json: the part record of every length (the platform contract)

Sources

fasten-it-din6885-1, fasten-it-uni6604, mikipulley-jis-b1301, roymech-din6885. Full citations: the method page and this size's datasheet.

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