Standard Tapers Table 1a. Morse Stub Taper Shanks Machinery's Handbook, 31st Edition
1014
A PLUG GAGE D
SHANK RAD G E N
SHANK
REAMER
M
P
Y
X
B
C
H
F
F
O
TAPER 1 3/4 ´´ PER FOOT
Shank
Tang
Small End of Plug, b D
Dia. End of Socket, a A
No. of Taper
Taper per Foot a
Taper per Inch b
Total Length, B
Depth, C
Thickness, E
Length, F
1 2 3 4 5
0.59858 0.049882 0.4314 0.59941 0.049951 0.6469 0.60235 0.050196 0.8753 0.62326 0.051938 1.1563 0.63151 0.052626 1.6526
0.475 0.700 0.938 1.231 1.748
1 5 ⁄ 16 1 11 ⁄ 16
1 1 ⁄ 8
13 ⁄ 64 19 ⁄ 64 25 ⁄ 64 33 ⁄ 64
5 ⁄ 16 7 ⁄ 16 9 ⁄ 16
1 7 ⁄ 16
2
1 3 ⁄ 4
2 1 ⁄ 16 2 11 ⁄ 16
2 3 ⁄ 8
11 ⁄ 16 15 ⁄ 16
3
3 ⁄ 4
Tang
Socket
Tang Slot
Min. Depth of Tapered Hole
Socket End to Tang Slot, M
No. of Taper
Radius of Mill, G
Drilled X
Reamed Y
Width, N
Length, O
Diameter, H
Plug Depth, P
1 2 3 4 5
3 ⁄ 16 7 ⁄ 32 9 ⁄ 32
13 ⁄ 32 39 ⁄ 64 13 ⁄ 16
7 ⁄ 8
15 ⁄ 16
29 ⁄ 32
25 ⁄ 32 15 ⁄ 16
7 ⁄ 32 5 ⁄ 16
23 ⁄ 32 15 ⁄ 16
1 1 ⁄ 16
1 5 ⁄ 32
1 7 ⁄ 64 1 5 ⁄ 16
1 1 ⁄ 4
1 3 ⁄ 8
1 1 ⁄ 16 1 3 ⁄ 16 1 7 ⁄ 16
1 1 ⁄ 8 1 3 ⁄ 8 1 3 ⁄ 4
13 ⁄ 32 17 ⁄ 32 25 ⁄ 32
1 3 ⁄ 32 1 19 ⁄ 32
1 7 ⁄ 16
1 9 ⁄ 16
1 1 ⁄ 2 1 7 ⁄ 8
3 ⁄ 8
1 13 ⁄ 16
1 15 ⁄ 16
9 ⁄ 16
All dimensions in inches. Radius J is 3 ⁄ 64 , 1 ⁄ 16 , 5 ⁄ 64 , 3 ⁄ 32 , and 1 ⁄ 8 inch respectively for Nos. 1, 2, 3, 4, and 5 tapers. a These are basic dimensions. b These dimensions are calculated for reference only.
Jarno Taper.— The Jarno taper was originally proposed by Oscar J. Beale of the Brown & Sharpe Mfg. Co. This taper is based on such simple formulas that practically no calcula tions are required when the number of taper is known. The taper per foot of all Jarno taper sizes is 0.600 inch on the diameter. The diameter at the large end is as many eighths, the diameter at the small end is as many tenths, and the length as many half inches as are indi cated by the number of the taper. For example, a No. 7 Jarno taper is 7 ⁄ 8 inch in diameter at the large end; 7 ⁄ 10 , or 0.700 inch at the small end; and 7 ⁄ 2 , or 3 1 ⁄ 2 inches long; hence, diame- ter at large end = No. of taper ÷ 8; diameter at small end = No. of taper ÷ 10; length of taper = No. of taper ÷ 2. The Jarno taper is used on various machine tools, especially profiling machines and die-sinking machines. It has also been used for the headstock and tailstock spindles of some lathes.
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