References
■ Standard of Tapers ● Morse Taper
Fig.1 With Tang
Fig.2 Drawing Thread Type
C
K
8°18'
R
r
e
r
N B
N B
t
a
a
(Unit: mm )
N
Taper
Tang
Morse Taper Number
Taper Angle ( α )
B (Max)
N (Max)
Taper (1)
Fig
(2)
(2)
d 2 (Max)
D 1
C (Max)
e (Max)
d 1
D a
b
R r
(approx.)
(approx.)
1 19.212 1 20.047 1 20.020 1 19.922 1 19.245 1 19.002 1 19.180 1 19.231
0
0.05205 1°29'27"
9.045 3
9.2 6.1 56.5 59.5 6.0 3.9 6.5 10.5 4 1
1
0.04988 1°25'43" 12.065 3.5 12.2 9.0 62.0 65.5 8.7 5.2 8.5 13.5 5 1.2
2
0.04995 1°25'50" 17.780 5 18.0 14.0 75.0 80.0 13.5 6.3 10 16
6 1.6
3
0.05020 1°26'16" 23.825 5 24.1 19.1 94.0 99.0 18.5 7.9 13 20
7 2
1
4
0.05194 1°29'15" 31.267 6.5 31.6 25.2 117.5 124.0 24.5 11.9 16 24
8 2.5
5
0.05263 1°30'26" 44.399 6.5 44.7 36.5 149.5 156.0 35.7 15.9 19 29
10 3
6
0.05214 1°29'36" 63.348 8 63.8 52.4 210.0 218.0 51.0 19.0 27 40
13 4
7
0.05200 1°29'22" 83.058 10 83.6 68.2 286.0 296.0 66.8 28.6 35 54
19 5
Taper
Thread
Morse Taper Number
Taper Angle ( α )
N (Max)
B (Max)
Taper (1)
Fig
(2)
(2)
d 2 (Max)
D 1
d 1
K (Min)
t (Max)
D a
d 3
r
(approx.)
(approx.)
1 19.212 1 20.047 1 20.020 1 19.922 1 19.254 1 19.002 1 19.180 1 19.231
0
0.05205 1°29'27"
9.045 3
9.2 6.4 50
53 6
-
-
4
0.2
1
0.04988 1°25'43" 12.065 3.5 12.2 9.4 53.5 57 9
M 6 16
5
0.2
2
0.04995 1°25'50" 17.780 5 18.0 14.6 64
69 14
M10 24
5
0.2
3
0.05020 1°26'16" 23.825 5 24.1 19.8 81
86 19
M12 28
7
0.6
2
4
0.05194 1°29'15" 31.267 6.5 31.6 25.9 102.5 109 25
M16 32
9
1
5
0.05263 1°30'26" 44.399 6.5 44.7 37.6 129.5 136 35.7 M20 40 9
2.5
6
0.05214 1°29'36" 63.348 8 63.8 53.9 182 190 51
M24 50 12
4
7
0.05200 1°29'22" 83.058 10 83.6 70.0 250 260 65
M33 80 18.5 5
Note (1) The fractional values are the taper standards. (2) Diameters D 1 and d 1 are calculated from the diameter D value, the taper, a, and M 1 and rounded up to one decimal place. Remark 1. Tapers are measured using JIS B 3301 ring gauges. At least 75% must be correct. 2. Screws must have metric coarse screw thread as per JIS B 0205 and Class 3 precision as per JIS B 0209.
● American Standard Taper (National Taper)
● Bottle Grip Taper
L
t 1
Fig 3
Fig 4
t
L
t 5
t 7
a
t 4
N
t 2
t 3
L B 3
B
L 3
7/24 Taper
b 1
7/24 Taper
L 4
● Bottle Grip Taper
(Units: mm )
D (Standard Dimensions)
B L 3
L 4
D 1
D 2
t 1
t 2
t 3
t 4
t 5
d 2
d 3
L
g b 1
t 7
Taper No.
Fig
BT30
31.75 46 38 20 8 13.6 2 2 14 12.5 48.4 24 7 17 M12 16.1 16.3
BT35
38.10 53 43 22 10 14.6 2 2 14 12.5 56.4 24 7 20 M12 16.1 19.6
BT40
44.45 63 53 25 10 16.6 2 2 19 17 65.4 30 8 21 M16 16.1 22.6
3
BT45
57.15 85 73 30 12 21.2 3 3 23 21 82.8 36 9 26 M20 19.3 29.1
BT50
69.85 100 85 35 15 23.2 3 3 27 25 101.8 45 11 31 M24 25.7 35.4
BT60
107.95 155 135 45 20 28.2 3 3 33 31 161.8 56 12 34 M30 25.7 60.1
● American Standard Taper (National Taper)
(Units: mm )
L 1 (Min.) L 2 (Min.) L 3 (Min.)
D
d 1
L
g
a
t
b
Fig
Taper No. Nominal Dimensions
-0.29 -0.36 -0.30 -0.384
30
1 1 / 1 3 / 2 3 / 4 1 /
1 /
31.750 17.4
68.4 48.4 24
34
1.6 15.9 16
4"
2"
40
5 /
44.450 25.3
93.4 65.4 32
43
1.6 15.9 22.5
4"
8"
4
-0.31 -0.41 -0.34 -0.46
50
69.850 39.6
126.8 101.8 47
62
1"
3.2 25.4 35
4"
60
1 1 /
107.950 60.2
206.8 161.8 59
76
3.2 25.4 60
4"
4"
N73
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