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Sunk Keys and Keyways (excerpt from JIS B 1301:1996)

Parallel Keys and keyways
Taper Keys, gib-headed taper keys, and keyways

Parallel Keys and keyways^*1

(Unit: mm)

Nominal dimensions of key b × h	Keyway dimensions										Reference
	Standard dimensions of b1 and b2	(Sliding style)		Middle		Fine	r1 and r2	Standard dimensions of t1	Standard dimensions of t2	Allowable tolerance of t1 and t2	Compatible shaft diameter d ^*2
		b1	b2	b1	b2	b1 and b2
		Allowable tolerance （H9）	Allowable tolerance （D10）	Allowable tolerance （N9）	Allowable tolerance （Js9）	Allowable tolerance （P9）
2×2	2	＋0.025 0	＋0.060 ＋0.020	－0.004 －0.029	±0.0125	－0.006 －0.031	0.08～0.16	1.2	1.0	＋ 0.1 0	6～8
3×3	3	＋0.025 0	＋0.060 ＋0.020	－0.004 －0.029	±0.0125	－0.006 －0.031		1.8	1.4		8～10
4×4	4	＋0.030 0	＋0.078 ＋0.030	0 －0.030	±0.0150	－0.012 －0.042		2.5	1.8		10～12
5×5	5						0.16～0.25	3.0	2.3		12～17
6×6	6							3.5	2.8		17～22
（7×7）	7	＋ 0.036 0	＋0.098 ＋0.040	0 －0.036	±0.0180	－0.015 －0.051		4.0	3.0	＋0.2 0	20～25
8×7	8							4.0	3.3		22～30
10×8	10						0.25～0.40	5.0	3.3		30～38
12×8	12	＋0.043 0	＋0.120 ＋0.050	0 －0.043	±0.0215	－0.018 －0.061		5.0	3.3		38～44
14×9	14							5.5	3.8		44～50
（15×10）	15							5.0	5.0		50～55
16×10	16							6.0	4.3		50～58
18×11	18							7.0	4.4		58～65
20×12	20	＋0.052 0	＋0.149 ＋0.065	0 － 0.052	±0.0260	－0.022 －0.074	0.40～0.60	7.5	4.9		65～75
22×14	22							9.0	5.4		75～85
（24×16）	24							8.0	8.0		80～90
25×14	25							9.0	5.4		85～95
28×16	28							10.0	6.4		95～110
32×18	32	＋0.062 0	＋0.180 ＋0.080	0 － 0.062	±0.0310	－0.026 －0.088		11.0	7.4		110～130
（35×22）	35						0.70～1.00	11.0	11.0	+0.3 0	125～140
36×20	36							12.0	8.4		130～150
（38×24）	38							12.0	12.0		140～160
40×22	40							13.0	9.4		150～170
（42×26）	42							13.0	13.0		160～180
45×25	45							15.0	10.4		170～200
50×28	50							17.0	11.4		200～230
56×32	56	＋0.074 0	＋0.220 ＋0.100	0 － 0.074	±0.0370	－0.032 －0.106	1.20～1.60	20.0	12.4		230～260
63×32	63							20.0	12.4		260～290
70×36	70							22.0	14.4		290～330
80×40	80						2.00～2.50	25.0	15.4		330～380
90×45	90	＋0.087 0	＋0.260 ＋0.120	0 － 0.087	±0.0435	－0.037 －0.124		28.0	17.4		380～440
100×50	100	＋0.087 0	＋0.260 ＋0.120	0 － 0.087	±0.0435	－0.037 －0.124		31.0	19.5		440～500

Taper Keys, gib-headed taper keys, and keyways^*3

Taper Keys, Gib-Headed Taper Keys, and Keyways_1

(Unit: mm)

Nominal dimensions of key b × h	Key dimensions								Keyway dimensions						Reference
	b		h			h1	c	ℓ ^*4	b1 and b2		r1 and r2	Standard dimensions of t1	Standard dimensions of t2	Allowable tolerance of t1 and t2	Compatible shaft diameter d ^*5
	Standard dimensions	Allowable tolerance (h9)	Standard dimensions	Allowable tolerance		h1	c	ℓ ^*4	Standard dimensions	Allowable tolerance (D10)	r1 and r2	Standard dimensions of t1	Standard dimensions of t2	Allowable tolerance of t1 and t2	Compatible shaft diameter d ^*5
2×2	2	0 － 0.025	2	0 － 0.025	h9	－	0.16 ～0.25	6～30	2	＋0.060 ＋0.020	0.08 ～0.16	1.2	0.5	＋0.05 0	6～8
3×3	3	0 － 0.025	3	0 － 0.025		－		6～36	3	＋0.060 ＋0.020		1.8	0.9	＋0.05 0	8～10
4×4	4	0 －0.030	4	0 －0.030		7		8～45	4	＋0.078 ＋0.030		2.5	1.2	＋0.1 0	10～12
5×5	5		5			8	0.25 ～0.40	10～56	5		0.16 ～0.25	3.0	1.7		12～17
6×6	6		6			10		14～70	6			3.5	2.2		17～22
（7×7）	7	0 －0.036	7.2	0 －0.036		10		16～80	7	＋0.098 ＋0.040		4.0	3.0		20～25
8×7	8		7	0 －0.090	h11	11		18～90	8			4.0	2.4	＋0.2 0	22～30
10×8	10		8			12	0.40 ～0.60	22～110	10		0.25 ～0.40	5.0	2.4		30～38
12×8	12	0 －0.043	8			12		28～140	12	＋0.120 ＋0.050		5.0	2.4		38～44
14×9	14		9			14		36～160	14			5.5	2.9		44～50
（15×10）	15		10.2	0 －0.070	h10	15		40～180	15			5.0	5.0	＋0.1 0	50～55
16×10	16		10	0 －0.090	h11	16		45～180	16			6.0	3.4	＋0.2 0	50～58
18×11	18		11	0 －0.110		18		50～200	18			7.0	3.4		58～65
20×12	20	0 －0.052	12			20	0.60 ～0.80	56～220	20	＋0.149 ＋0.065	0.40 ～0.60	7.5	3.9		65～75
22×14	22		14			22		63～250	22			9.0	4.4		75～85
（24×16）	24		16.2	0 －0.070	h10	24		70～280	24			8.0	8.0	＋0.1 0	80～90
25×14	25		14	0 －0.110	h11	22		70～280	25			9.0	4.4	＋0.2 0	85～95
28×16	28		16			25		80～320	28			10.0	5.4		95～110
32×18	32	0 －0.062	18			28		90～360	32	＋0.180 ＋0.080		11.0	6.4		110～130
（35×22）	35		22.3	0 －0.084	h10	32	1.00 ～1.20	100～400	35		0.70 ～1.00	11.0	11.0	＋0.15 0	125～140
36×20	36		20	0 －0.130	h11	32		－	36			12.0	7.1	＋0.3 0	130～150
（38×24）	38		24.3	0 －0.084	h10	36		－	38			12.0	12.0	＋0.15 0	140～160
40×22	40		22	0 －0.130	h11	36		－	40			13.0	8.1	＋0.3 0	150～170
（42×26）	42		26.3	0 －0.084	h10	40		－	42			13.0	13.0	＋0.15 0	160～180
45×25	45		25	0 －0.130	h11	40		－	45			15.0	9.1	＋0.3 0	170～200
50×28	50		28	0 －0.130		45		－	50			17.0	10.1		200～230
56×32	56	0 －0.074	32	0 －0.160		50	1.60 ～2.00	－	56	＋0.220 ＋0.100	1.20 ～1.60	20.0	11.1		230～260
63×32	63		32			50		－	63			20.0	11.1		260～290
70×36	70		36			56		－	70			22.0	13.1		290～330
80×40	80		40			63	2.50 ～3.00	－	80		2.00 ～2.50	25.0	14.1		330～380
90×45	90	0 －0.087	45			70		－	90	＋0.260 ＋0.120		28.0	16.1		380～440
100×50	100	0 －0.087	50			80		－	100	＋0.260 ＋0.120		31.0	18.1		440～500

Notes

^*1 Keys with nominal dimensions noted in brackets are not specified in the corresponding international standard and are not used for new designs.
^*2 The compatible shaft diameter is determined from the torque corresponding to the key strength, shown as a guide for general applications. If the size of the key is appropriate for the torque to be transmitted, a shaft larger than the compatible shaft diameter can be used. In this case, it is advisable to repair t1 and t2 so that the sides of the key are evenly applied to the shaft and hub. It should not be used for shafts thinner than the compatible shaft diameter.
^*3 Keys with nominal dimensions noted in brackets should be used as little as possible.
The boss groove should generally have a 1/100th gradient.
^*4 ℓ shall be chosen from the table.
In principle, the dimensional tolerance of ℓ shall be h12 as shown in JIS B0401 (dimensional tolerance or engagement).
6,8,10,12,14,16,18,20,22,25,28,32,36,40,45,50,56,63,70,80,90,100,110,125,140,160,180,200,220,250,280,320,360,400
^*5: The compatible shaft diameter should be compatible with the torque relative to the key strength.