Straight Sided Spline Dimensions

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)

 Source: http://www.roymech.co.uk/Useful_Tables/Keyways/Spline.html