Keyway and Key Size Dimensions
W
Standard Key and Keyway Sizing
h
T1
T
r
H
T2
English Dimensions:
Metric Dimensions:
Keyway: W x T1
Key: W x T
Keyway: W x h
Key: W x T
Metric Standard Parallel Keyway and Key Sizes
Shaft Diameter
(mm)
Keyway and Key Size Dimension Reference
English Standard Keyway and Key Sizes
Shaft Diameter
(in)
From
To
5/16
1/2
5/8
15/16
1-5/16
1-7/16
1-13/16
2-5/16
2-13/16
3-5/16
3-13/16
4-9/16
5-9/16
6-9/16
7-9/16
7/16
9/16
7/8
1-1/4
1-3/8
1-3/4
2-1/4
2-3/4
3-1/4
3-3/4
4-1/2
5-1/2
6-1/2
7-1/2
9
Keyway
(in)*
Width
Depth
(W)
(T1)
Width
(W)
Depth
(T)
3/32
1/8
3/16
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
1-3/4
2
3/32
1/8
3/16
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
1-3/4
2
3/32
1/8
3/16
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
1-1/2
1-1/2
* Common dimension specification
3/64
1/16
3/32
1/8
5/32
3/16
1/4
5/16
3/8
7/16
1/2
5/8
3/4
3/4
3/4
Key
(in)
Keyway
(mm)
From
To
Width
(W)
6
9
11
13
18
23
31
39
45
51
59
66
76
86
96
111
131
151
171
201
231
261
291
331
381
441
8
10
12
17
22
30
38
44
50
58
65
75
86
96
110
130
150
170
200
230
260
290
330
380
440
500
2
3
4
5
6
8
10
12
14
16
18
20
22
25
28
32
36
40
45
50
56
63
70
80
90
100
Key
(mm)*
Depth Width Depth
(h)
(W)
(T)
1.0
1.4
1.8
2.3
2.8
3.3
3.3
3.3
3.8
4.3
4.4
4.9
5.4
5.4
6.4
7.4
8.4
9.4
10.4
11.4
12.4
12.4
14.4
15.4
17.4
19.5
* Common dimension specification
2
3
4
5
6
8
10
12
14
16
18
20
22
25
28
32
36
40
45
50
56
63
70
80
90
100
2
3
4
5
6
7
8
8
9
10
11
12
14
14
16
18
20
22
25
28
32
32
36
40
45
50