4x4 Parallel Key (Feather Key), Form B, DIN 6885

The 4x4 parallel key (DIN 6885, form B): key width 4 mm, key height 4 mm, edge chamfer 0.16 to 0.25 mm. Available as 14 lengths from 8 to 45 mm, each as simplified STEP.

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

• Also searched as: 4x4 key, 4x4 x 8 to 4x4 x 45 keys
• Model id: din6885-b-4x4
• Standard: DIN 6885:2021 · size 4x4

Lengths

Length (mm)	Part key	Simplified
8	din6885-b-4x4x8	STEP
10	din6885-b-4x4x10	STEP
12	din6885-b-4x4x12	STEP
14	din6885-b-4x4x14	STEP
16	din6885-b-4x4x16	STEP
18	din6885-b-4x4x18	STEP
20	din6885-b-4x4x20	STEP
22	din6885-b-4x4x22	STEP
25	din6885-b-4x4x25	STEP
28	din6885-b-4x4x28	STEP
32	din6885-b-4x4x32	STEP
36	din6885-b-4x4x36	STEP
40	din6885-b-4x4x40	STEP
45	din6885-b-4x4x45	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
b	Key width	3.97	4	4	3.985	midpoint of min–max	L1
h	Key height	3.97	4	4	3.985	midpoint of min–max	L1
s	Edge chamfer	0.16		0.25	0.205	midpoint of min–max	L1
d_shaft	Shaft diameter range	10		12	11	midpoint of min–max	L1
t1	Shaft keyway depth		2.5		2.5	nominal	L1
t2	Hub keyway depth		1.8		1.8	nominal	L1

Drawing

As a PDF: CC-DIN6885-SZ-4x4.pdf.

The 4x4 form B parallel key beside the 3x3 and the 5x5

The 4x4 is number 3 of the 5 DIN 6885 parallel keys published here, listed from 2x2 to 6x6.

• Key width (b): 4 mm on the 4x4 form B parallel key, against 3 mm on the 3x3 and 5 mm on the 5x5.
• Key height (h): 4 mm on the 4x4 form B parallel key, against 3 mm on the 3x3 and 5 mm on the 5x5.
• Edge chamfer (s): 0.16 to 0.25 mm on the 4x4 form B parallel key, against 0.16 to 0.25 mm on the 3x3 and 0.25 to 0.4 mm on the 5x5.
• Shaft diameter range (d_shaft): 10 to 12 mm on the 4x4 form B parallel key, against 8 to 10 mm on the 3x3 and 12 to 17 mm on the 5x5.
• Shaft keyway depth (t1): 2.5 mm on the 4x4 form B parallel key, against 1.8 mm on the 3x3 and 3 mm on the 5x5.
• Hub keyway depth (t2): 1.8 mm on the 4x4 form B parallel key, against 1.4 mm on the 3x3 and 2.3 mm on the 5x5.

The 4x4 form B parallel key in its other forms

• 4x4 Parallel Key (Feather Key), Form A, DIN 6885, with the same values.
• 4x4 Parallel Key (Feather Key), Form AB, DIN 6885, with the same values.

Other sizes

• One size smaller: 3x3 Parallel Key (Feather Key), Form B, DIN 6885.
• One size larger: 5x5 Parallel Key (Feather Key), Form B, DIN 6885.

Documents

• CC-DIN6885-DS-4x4.pdf: 4x4 datasheet: values with levels, lengths, sources
• CC-DIN6885-SZ-4x4.pdf: 4x4 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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