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Date Updated:Jan. 27. 2025

Key and Their Corresponding Keyways

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Key and Their Corresponding Keyways

Shape and dimensions of parallel key and keyway

Unit : mm

Nominal dimen
sion of key b×h
 Key dimension
 Keyway dimension
 Reference
b h C l Basic dimen
sion of b1
and b2		 Sliding type
 Normal type
 Fastening type
 r1
and
r2		 Basic dimen
sion of t1		 Basic dimen
sion of t2		 Allow
ance t1 and
t2		 Compliant shaft diameter d
Basic Dimen
sion
 Allow
ance (h9)
 Basic Dimen
sion
 Allowance
 b1  b2  b1  b2  b1 and b2
Allow
ance
(H9)		 Allow
ance
(D10)		 Allow
ance
(N9)		 Allow
ance
(Js9)		 Allow
ance
(P9)
2×2 2  0
-0.025		 2  0
-0.025		 h9 0.16
~0.25		 6~20 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 3 6~36 3 1.8 1.4 8~10
4×4 4  0
-0.030		 4  0
-0.030		 8~45 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 5 0.25
~0.40		 10~56 5 0.16
~0.25		 3.0 2.3 12~17
6×6 6 6 14~70 6 3.5 2.8 17~22
(7×7) 7  0
-0.036		 7  0
-0.036		 16~80 7 +0.036
  0		 +0.098
+0.040		  0
-0.036		 ±0.0180 -0.015
-0.051		 4.0 3.3 +0.2
  0		 20~25
8×7 8 7  0
-0.090		 h11 18~90 8 4.0 3.3 22~30
10×8 10 8 0.40
~0.60		 22~110 10 0.25
~0.40		 5.0 3.3 30~38
12×8 12  0
-0.043		 8 28~140 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 9 36~160 14 5.5 3.8 44~50
(15×10) 15 10 40~180 15 5.0 5.3 50~55
16×10 16 10 45~180 16 6.0 4.3 50~58
18×11 18 11  0
-0.110		 50~200 18 7.0 4.4 58~65
20×12 20  0
-0.052		 12 0.60
~0.80		 56~220 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 14 63~250 22 9.0 5.4 75~85
(24×16) 24 16 70~280 24 8.0 8.4 80~90
25×14 25 14 70~280 25 9.0 5.4 85~95
28×16 28 16 80~320 28 10.0 6.4 95~110
32×18 32  0
-0.062		 18 90~360 32 +0.062
  0		 +0.180
+0.080		  0
-0.062		 ±0.0310 -0.026
-0.088		 11.0 7.4 110~130

Shape and dimensions of taper key, headed taper key and keyway

Unit : mm

Nominal
dimen
sion
of key
b×h 		Key dimension
 Keyway dimension
 Reference
b h h1 C l b1 and b2 r1
and
r2		 Basic
dimen
sion
of t1		 Basic
dimen
sion
of t2		 Allow
ance
of t1
and t2		 Compliant
shaft
diameter
d
Basic
Dimen
sion
 Allow
ance
(h9) 		 Basic
Dimen
sion
 Allowance
 Basic
dimen
sion
 Allow
ance
(D10)
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 3 - 6~36 3 1.8 0.9 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



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