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GB/T 1564-2003
Rectangular key-Type C
Nom
b max
b min
h max
h min
c min
c max
r min
r max
2x2
2
1.986
2
1.94
0.16
0.25
0.16
0.25
3x3
3
2.986
3
2.94
0.16
0.25
0.16
0.25
4x4
4
3.982
4
3.925
0.16
0.25
0.16
0.25
5x5
5
4.982
5
4.925
0.25
0.4
0.25
0.4
6x6
6
5.982
6
5.925
0.25
0.4
0.25
0.4
8x7
8
7.978
7
6.91
0.25
0.4
0.25
0.4
10x8
10
9.978
8
7.91
0.4
0.6
0.4
0.6
12x8
12
11.973
8
7.91
0.4
0.6
0.4
0.6
14x9
14
13.973
9
8.91
0.4
0.6
0.4
0.6
16x10
16
15.973
10
9.91
0.4
0.6
0.4
0.6
18x11
18
17.973
11
10.89
0.4
0.6
0.4
0.6
20x12
20
19.967
12
11.89
0.6
0.8
0.6
0.8
22x14
22
21.967
14
13.89
0.6
0.8
0.6
0.8
25x14
25
24.967
14
13.89
0.6
0.8
0.6
0.8
28x16
28
27.967
16
15.89
0.6
0.8
0.6
0.8
32x18
32
31.961
18
17.89
0.6
0.8
0.6
0.8
36x20
36
35.961
20
19.87
1
1.2
1
1.2
40x22
40
39.961
22
21.87
1
1.2
1
1.2
45x25
45
44.961
25
24.87
1
1.2
1
1.2
50x28
50
49.961
28
27.87
1
1.2
1
1.2
56x32
56
55.954
32
31.84
1.6
2
1.6
2
63x32
63
62.954
32
31.84
1.6
2
1.6
2
70x36
70
69.954
36
35.84
1.6
2
1.6
2
80x40
80
79.954
40
39.84
2.5
3
2.5
3
90x45
90
89.946
45
44.84
2.5
3
2.5
3
100x50
100
99.946
50
49.84
2.5
3
2.5
3
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