Standard Tapers Table 11. Jarno Taper Shanks Machinery's Handbook, 31st Edition
1024
D
C
B
A
No. of Taper 8
No. of Taper 10
No. of Taper 2
C =
B =
D =
Taper per foot
Number of Taper
Length A
Length B
Diameter C
Diameter D
2 3 4 5 6 7 8 9
1
0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00
0.250 0.375 0.500 0.625 0.750 0.875 1.000 1.125 1.250 1.375 1.500 1.625 1.750 1.875 2.000 2.125 2.250 2.375 2.500
0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600 0.600
1 1 ⁄ 8 1 5 ⁄ 8
1 1 ⁄ 2
2
2 3 ⁄ 16 2 11 ⁄ 16 3 3 ⁄ 16 3 11 ⁄ 16 4 3 ⁄ 16 4 11 ⁄ 16
2 1 ⁄ 2
3
3 1 ⁄ 2
4
4 1 ⁄ 2
10 11 12 13 14 15 16 17 18 19 20
5
5 1 ⁄ 4 5 3 ⁄ 4 6 1 ⁄ 4 6 3 ⁄ 4 7 1 ⁄ 4 7 3 ⁄ 4
5 1 ⁄ 2
6
6 1 ⁄ 2
7
7 1 ⁄ 2
8
8 5 ⁄ 16 8 13 ⁄ 16 9 5 ⁄ 16 9 13 ⁄ 16
8 1 ⁄ 2
9
9 1 ⁄ 2
10 5 ⁄ 16 0.600 Tapers for Machine Tool Spindles.— Most lathe spindles have Morse tapers, most mill ing machine spindles have American Standard tapers, almost all smaller milling machine spindles have R8 tapers, page 1033 , and large vertical milling machine spindles have American Standard tapers. The spindles of drilling machines and the taper shanks of twist drills are made to fit the Morse taper. For lathes, the Morse taper is generally used, but lathes may have the Jarno, the Brown & Sharpe, or a special taper. Of 33 lathe man- ufacturers, 20 use the Morse taper; 5, the Jarno; 3 use special tapers of their own; 2 use modified Morse (longer than the standard but the same taper); 2 use Reed (which is a short Jarno); 1 uses the Brown & Sharpe standard. For grinding machine centers, Jarno, Morse, and Brown & Sharpe tapers are used. Of ten grinding machine manufacturers, 3 use Brown & Sharpe; 3 use Morse; and 4 use Jarno. The Brown & Sharpe taper is used extensively for milling machine and dividing head spindles. The standard milling ma- chine spindle adopted in 1927 by the milling machine manufacturers of the National Ma- chine Tool Builders’ Association (now The Association for Manufacturing Technology [AMT]) has a taper of 3 1 ⁄ 2 inches per foot. This comparatively steep taper was adopted to ensure easy release of arbors. 10
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