Metric Keyway Details

METRIC KEYWAY DIMENSIONS – BRITISH STANDARD 4235 PART 1 1972

SHAFT DIAMETER (mm)		KEY (mm)	GROOVE DIMENSIONS (mm)
≤	>		X	MIN “X”	MAX “X”	T	MIN “Y1”	MAX “Y1”	MIN “Y2”	MAX “Y2”	r
10	12	4 x 4	4	3.985	4.015	4	2.5	2.6	1.8	1.9	0.16
12	17	5 x 5	5	4.985	5.015	5	3.0	3.1	2.3	2.4	0.25
17	22	6 x 6	6	5.985	6.015	6	3.5	3.6	2.8	2.9	0.25
22	30	8 x 7	8	7.982	8.018	7	4.0	4.2	3.3	3.5	0.25
30	38	10 x 8	10	9.982	10.018	8	5.0	5.2	3.3	3.5	0.40
38	44	12 x 8	12	11.979	12.021	8	5.0	5.2	3.3	3.5	0.40
44	50	14 x 9	14	13.979	14.021	9	5.5	5.7	3.8	4.0	0.40
50	58	16 x 10	16	15.979	16.021	10	6.0	6.2	4.3	4.5	0.40
58	65	18 x 11	18	17.979	18.021	11	7.0	7.2	4.4	4.6	0.40
65	75	20 x 12	20	19.974	20.026	12	7.5	7.7	4.9	5.1	0.60
75	85	22 x 14	22	21.974	22.026	14	9.0	9.2	5.4	5.6	0.60
85	95	25 x 14	25	24.974	25.026	14	9.0	9.2	5.4	5.6	0.60
95	110	28 x 16	28	27.974	28.026	16	10.0	10.2	6.4	6.6	0.60
110	130	32 x 18	32	31.969	32.031	18	11.0	11.2	7.4	7.6	0.60
130	150	36 x 20	36	35.969	36.031	20	12.0	12.3	8.4	8.7	1.00
150	170	40 x 22	40	39.969	40.031	22	13.0	13.3	9.4	9.7	1.00
170	200	45 x 25	45	44.969	45.031	25	15.0	15.3	10.4	10.7	1.00
200	230	50 x 28	50	49.969	50.031	28	17.0	17.3	11.4	11.7	1.00

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