These Pages include various standards. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. It is also possible to become a BSI member and obtain copies of the Standards at much reduced prices.

Keyways Index

Keys and keyway Dimensions



KeyWay /Key Dimensions

keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys



Nominal Dia
d		 Key KeyWay
b x h width x thck Width b Depth Radius r
Nom Tolerance Class Shaft t1 Hub t2
Over Incl Free Normal Close/Int - - - -
Shaft
H9		 Hub
D10		 Shaft
N9		 Hub
Js9		 Shaft/Hub
P9		 Nom Tol Nom Tol Max min
6 8 2x2 2 +0,025
0		 +0,06
+0,02		 -0,004
-0,029		 +0,012
-0,012		 -0,006
-0,031		 1,2 +0,1
0		 1,0 +0,1
0		 0,16 0,08
8 10 3x3 3 1,8 1,4 0,16 0,08
10 12 4x4 4 +0,03
0		 +0,078
+0,030		 0
-0,030		 +0,015
-0,015		 -0,012
-0,042		 2,5 1,8 0,16 0,08
12 17 5x5 5 3,0 2,3 0,25 0,16
17 22 6x6 6 3,5 2,8 0,25 0,16
22 30 8x7 8 +0,036
0		 +0,098
+0,040		 0
-0,036		 +0,018
-0,018		 -0,015
-0,051		 4,0 +0,2
0		 3,3 +0,2
0		 0,25 0,16
30 38 10x8 10 5,0 3,3 0,40 0,25
38 44 12x8 12 +0,043
0		 +0,12
+0,050		 0
-0,043		 +0,021
-0,021		 -0,018
-0,061		 5,0 +0,2
0		 3,3 +0,2
0		 0,40 0,25
44 50 14x9 14 5,5 3,8 0,40 0,25
50 58 16x10 16 6,0 4,3 0,40 0,25
58 65 18x11 18 7,0 4,4 0,40 0,25
65 75 20x12 20 +0,052
0		 +0,149
+0,065		 0
-0,052		 +0,026
-0,026		 -0,022
-0,074		 7,5 4,9 0,60 0,40
75 85 22x14 22 9,0 5,4 0,60 0,40
85 95 25x14 25 9,0 5,4 0,60 0,40
95 110 28x16 28 10,0 6,4 0,60 0,40
110 130 32x18 32 +0,062
0		 +0,18
+0,080		 0
-0,062		 +0,031
-0,031		 -0,026
-0,088		 11,0 7,4 0,6 0,4
130 150 36x20 36 12,0 +0,3
0		 8,4 +0,3
0		 1,0 0,7
150 170 40x22 40 13,0 9,4 1,0 0,7
170 200 45x25 45 15,0 10,4 1,0 0,7
200 230 50x28 50 17,0 11,4 1,0 0,7
230 260 56x32 56 +0,074
0		 +0,220
0,100		 0
-0,074		 +0,037
-0,037		 -0,032
-0,106		 20,0 12,4 1,6 1,2
260 290 63x32 63 20,0 12,4 1,6 1,2
290 330 70x36 70 22,0 14,4 1,6 1,2
330 380 80x40 80 25,0 15,4 2,5 2,0
380 440 90x45 90 +0,087
0		 +0,260
0,120		 0
-0,087		 +0,043
-0,043		 -0,037
-0,124		 28,0 17,4 2,5 2,0
440 500 100x50 100 31,0 19.5 2,5 2,0


Key Dimensions

Width b Thickness h Chamfer S Range Of Lengths
Nom Tol(h9) Nom As indicated(h9/h11) Min Max From Inc
2 0
-0,025		 2 (h9)
0
-0,025		 0,16 0,25 6 20
3 3 0,16 0,25 6 36
4 0
-0,030		 4 (h9)
0
-0,030		 0,16 0,25 8 45
5 5 0,25 0,40 10 56
6 6 0,25 0,40 14 70
8 0
-0,036		 7 (h11)
0
-0,090		 0,25 0,40 18 90
10 8 0,40 0,60 22 110
12 0
-0,043		 8 0,40 0,60 28 140
14 9 0,40 0,60 36 160
16 10 0,40 0,60 45 180
18 11 (h11)
0
-0,110		 0,40 0,60 50 200
20 0
-0,052		 12 0,60 0,80 56 220
22 14 0,60 0,80 63 250
25 14 0,60 0,80 70 280
28 16 0,60 0,80 80 320
32 0
-0,062		 18 0,60 0,80 90 360
36 20 (h11)
0
-0,130		 1,00 1,20 100 400
40 22 1,00 1,20 - -
45 25 1,00 1,20 - -
50 28 1,00 1,20 - -
56 0
-0,074		 32 (h11)
0
-0,160		 1,60 2,00 - -
63 32 1,60 2,00 - -
70 36 1,60 2,00 - -
80 40 2,50 3,00 - -
90 0
-0,087		 45 2,50 3,00 - -
100 50 2,50 3,00 - -


Standard keylengths (mm)

6 - 8 - 10 - 12 - 14 - 16 - 18 - 20 - 22 - 25 - 28 - 32 - 36 - 40 - 45 - 50 - 56 - 63 - 70 - 80 - 90 - 100 - 110 - 125 - 140 - 160 - 180 - 200 - 220 - 250 - 280 - 320 - 360 - 400





b>Links Providing information on Keyways
  1. Mitcalc.com...Excel based programme allowing detailed design of shaft connection (19 Eur)
  2. Hercules -Keyways dimensions ...Download of keyway dimensions
  3. Specifying Rectangular Keyways ...MDmetric document - useful check information for my tables
  4. Transeals - Keyways ...Transeals - useful check information for my tables

Keyways Index

Remember - the information on this site is for general information purposes only and while we endeavour to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about its completeness, accuracy, reliability, suitability or availability. Any reliance you place on such information is therefore strictly at your own risk.

Roy Beardmore passed away on 9th March 2013. He is sadly missed. This website, Roymech, has been an invaluable resource for engineers around the world and we hope to maintain this incredible legacy going forward.

Have a question? Contact us.

© 2020 Roymech.org