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Metric Keyways Explained: Dimensions, Tolerances, and Key Applications

Dimensions and tolerances of metric keyways for parallel keys

Keys and keyways secure the hub and shaft to prevent relative movement between a power transmitting shaft and an attached component.

Read more  on how keys and keyways work and what types are available – Keys and Keyways

For example, Gear drives, Pulleys or Sprockets are connected securely using keys to the power transmitting shaft.

Metric Keyways Explained: Dimensions, Tolerances, and Key Applications
ShaftKeyKey way
Nominal
Diameter 		SizeWidth ( b )Depth (t)Radius
( r )
NomFreeNormalClose/
Interference		Shaft
(t1)		Hub
(t2)
dShaft (H9)Hub (D10)Shaft (N9)Hub (Js9)Shaft/Hub (P9)
OverInclb x hMinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMaxMinMax
682x220+0,025+0,02+0,06-0,029-0,004-0,012+0,012-0,031-0,006 1,21.31,01.10,080,16
8103x330+0,025+0,02+0,06-0,029-0,004-0,012+0,012-0,031-0,006 1,81.91,41.50,080,16
10124x440+0,03+0,030+0,078-0,0300-0,015+0,015-0,042-0,0122,52.61,81.90,080,16
12175x550+0,03+0,030+0,078-0,0300-0,015+0,015-0,042-0,0123,03.12,32.40,160,25
17226x660+0,03+0,030+0,078-0,0300-0,015+0,015-0,042-0,0123,53.62,82.90,160,25
22308x780+0,036+0,040+0,098-0,0360-0,018+0,018 -0,051-0,015 4,04.23,33,50,160,25
303810x8100+0,036+0,040+0,098-0,0360-0,018+0,018 -0,051-0,015 5,05.23,33,50,250,40
384412x8120+0,043+0,050+0,12-0,0430 -0,021+0,021-0,061-0,0185,05.23,33,50,250,40
445014x9140+0,043+0,050+0,12-0,0430 -0,021+0,021-0,061-0,0185,55.73,84,00,250,40
505816x10160+0,043+0,050+0,12-0,0430 -0,021+0,021-0,061-0,0186,06.24,34,50,250,40
586518x11180+0,043+0,050+0,12-0,0430 -0,021+0,021-0,061-0,0187,07.24,44,60,250,40
657520x12200+0,052+0,065+0,149-0,0520-0,026+0,026-0,074-0,0227,57.74,95,10,400,60
758522x14220+0,052+0,065+0,149-0,0520-0,026+0,026-0,074-0,0229,09.25,45,60,400,60
859525x14250+0,052+0,065+0,149-0,0520-0,026+0,026-0,074-0,0229,09.25,45,60,400,60
9511028x16280+0,052+0,065+0,149-0,0520-0,026+0,026-0,074-0,02210,010.26,46,60,400,60
11013032x18320+0,062+0,080+0,18-0,0620 -0,031+0,031-0,088-0,026 11,011.27,47,60,40,6
13015036x20360+0,062+0,080+0,18-0,0620 -0,031+0,031-0,088-0,026 12,012.38,48.70,71,0
15017040x22400+0,062+0,080+0,18-0,0620 -0,031+0,031-0,088-0,026 13,013.39,49.70,71,0
17020045x25450+0,062+0,080+0,18-0,0620 -0,031+0,031-0,088-0,026 15,015.310,410.70,71,0
20023050x28500+0,062+0,080+0,18-0,0620 -0,031+0,031-0,088-0,026 17,017.311,411.70,71,0
23026056x32560+0,0740,100+0,220-0,0740-0,037+0,037-0,106-0,03220,020.312,412.71,21,6
26029063x32630+0,0740,100+0,220-0,0740-0,037+0,037-0,106-0,03220,020.312,412.71,21,6
29033070x36700+0,0740,100+0,220-0,0740-0,037+0,037-0,106-0,03222,022.314,414.71,21,6
33038080x40800+0,0740,100+0,220-0,0740-0,037+0,037-0,106-0,03225,025.315,415.72,02,5
38044090x45900+0,0870,120+0,260-0,0870-0,043+0,043-0,124-0,03728,028.317,417.72,02,5
440500100x501000+0,0870,120+0,260-0,0870-0,043+0,043-0,124-0,03731,031.319.519.82,02,5

Dimensions and tolerances of metric keyways for parallel keys

Table 01.Dimensions and tolerances of keyways for parallel keys (source: BS 4235-1:1972)

Woodruff keys specification

Metric Keyways Explained: Dimensions, Tolerances, and Key Applications
KeyKey way
SizeWidth ( b )Depth (t)Radius
( r )
NomNormalClose/
Interference		Shaft
(t1)		Hub
(t2)
Shaft (N9)Hub (Js9)Shaft/Hub (P6)
b x h1 x DMinMaxMinMaxMinMaxMinMaxMinMaxMinMax
1,0 x 1,4 x 41-0,029-0,004 -0,012+0,012 -0,0031-0,006 1,01,10,60,70,160,08
1,5 x 2,6 x 71,5-0,029-0,004 -0,012+0,012 -0,0031-0,006 2,02,10,80,90,160,08
2,0 x 2,6 x 72,0-0,029-0,004 -0,012+0,012 -0,0031-0,006 1,81,91,01,10,160,08
2,0 x 3,7 x 102,0-0,029-0,004 -0,012+0,012 -0,0031-0,006 2,93,01,01,10,160,08
2,5 x 3,7 x 102,5-0,029-0,004 -0,012+0,012 -0,0031-0,006 2,72,81,21,30,160,08
3,0 x 5,0 x 133,0-0,029-0,004 -0,012+0,012 -0,0031-0,006 3,84,01,41,50,160,08
3,0 x 6,5 x 163,0-0,029-0,004 -0,012+0,012 -0,0031-0,006 5,35,51,41,50,160,08
4,0 x 6,5 x 164,0-0,0300 -0,015+0,015-0,042-0,0125,05,21,81,90,250,16
4,0 x 7,5 x 194,0-0,0300 -0,015+0,015-0,042-0,0126,06,21,81,90,250,16
5,0 x 6,5 x 165,0-0,0300 -0,015+0,015-0,042-0,0124,54,72,32,40,250,16
5,0 x 7,5 x 195,0-0,0300 -0,015+0,015-0,042-0,0125,55,72,32,40,250,16
5,0 x 9.0 x 225,0-0,0300 -0,015+0,015-0,042-0,0127,07,32,32,40,250,16
6,0 x 9,0 x 226,0-0,0300 -0,015+0,015-0,042-0,0126,56,82,82,90,250,16
6,0 x 11,0 x 286,0-0,0300 -0,015+0,015-0,042-0,0127,57,82,83,00,250,16
8,0 x 11,0 x 288,0-0.0360 -0.018+0,018 -0.051+0,015 8,08,33,33,50,400,25
10,0 x 13,0 x 3210,0-0.0360 -0.018+0,018 -0.051+0,015 10,010,33,33,50,40,25

Table 02.Dimensions and tolerances of metric keyways for Woodruff keys


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