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