Introduction
The tables below show the dimensions of a straight sided spline in accordance with BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements
Straight Sided Spline Dimensions

The profile of a straight sided spline is defined by
- N = Number of splines
- d = Minor Diameter
- D = Outside Diameter
|
d
|
Light Series |
Medium Series |
Designation..... |
N |
D |
B |
Designation..... |
N |
D |
B |
mm |
|
mm |
mm |
mm |
|
mm |
mm |
mm |
11 |
|
|
|
|
6 x 11 x 14 |
6 |
14 |
3 |
13 |
|
|
|
|
6 x 13 x 16 |
6 |
16 |
3,5 |
16 |
|
|
|
|
6 x 16 x 20 |
6 |
20 |
4 |
18 |
|
|
|
|
6 x 18 x 22 |
6 |
22 |
5 |
21 |
|
|
|
|
6 x 21 x 25 |
6 |
25 |
5 |
23 |
6 x 23 x 26 |
6 |
26 |
6 |
6 x 23 x 28 |
6 |
28 |
6 |
26 |
6 x 26 x 30 |
6 |
30 |
6 |
6 x 26 x 32 |
6 |
32 |
6 |
28 |
6 x 28 x 32 |
6 |
32 |
7 |
6 x 28 x 34 |
6 |
34 |
7 |
32 |
8 x 32 x 36 |
8 |
36 |
6 |
8 x 32 x 38 |
8 |
38 |
6 |
36 |
8 x 36 x 40 |
8 |
40 |
7 |
8 x 36 x 42 |
8 |
42 |
7 |
42 |
8 x 42 x 46 |
8 |
46 |
8 |
8 x 42 x 48 |
8 |
48 |
8 |
46 |
8 x 46 x 50 |
8 |
50 |
9 |
8 x 46 x 54 |
8 |
54 |
9 |
52 |
8 x 52 x 58 |
8 |
58 |
10 |
8 x 52 x 60 |
8 |
60 |
10 |
56 |
8 x 56 x 62 |
8 |
62 |
10 |
8 x 56 x 66 |
8 |
65 |
10 |
62 |
8 x 62 x 68 |
8 |
68 |
12 |
8 x 62 x 72 |
8 |
72 |
12 |
72 |
10 x 72 x 78 |
10 |
78 |
12 |
10 x 72 x 82 |
10 |
82 |
12 |
82 |
10 x 82 x 88 |
10 |
88 |
12 |
10 x 82 x 92 |
10 |
92 |
12 |
92 |
10 x 92 x 98 |
10 |
98 |
14 |
10 x 92 x 102 |
10 |
102 |
14 |
102 |
10 x 102 x 108 |
10 |
108 |
16 |
10 x 102 x 112 |
10 |
112 |
16 |
112 |
10 x 112 x 120 |
10 |
120 |
18 |
10 x 112 x 125 |
10 |
125 |
18 |
Tolerances of Straight sided Splines

Tolerances on Hole |
Tolerances on Shaft |
Type of Fit |
Not Treated After Broaching |
Treated After Broaching |
B |
D |
d |
B |
D |
d |
B |
D |
d |
H9 |
H10 |
H7 |
H11 |
H10 |
H7 |
d10 |
a11 |
f7 |
Sliding |
f9 |
a11 |
g7 |
Close fit |
h10 |
a11 |
h7 |
Fixed |
Tolerances Symmetry |
spline width B |
3 |
3,5 4 5 6 |
7 8 9 10 |
12 14 16 18 |
Tolerance of Symmetry (t) |
0,010 (IT7) |
0,012 (IT7) |
0,015 (IT7) |
0,018 (IT7) |
|