Machinery's Handbook, 31st Edition
1026
Standard Tapers Table 13. Jacobs Tapers and Threads for Drill Chucks and Spindles
A
B
E
D
G
F
H American Standard Thread Form
C
Taper Series No. 0 No. 1 No. 2 No. 2 a No. 3
Taper per Ft.
Taper Series No. 4 No. 5 No. 6
Taper per Ft.
A
B
C
A
B
C
0.2500 0.22844 0.43750 0.59145 0.3840 0.33341 0.65625 0.92508 0.5590 0.48764 0.87500 0.97861 0.5488 0.48764 0.75000 0.97861 0.8110 0.74610 1.21875 0.63898
1.1240 1.0372 1.4130 1.3161 0.6760 0.6241
1.6563 0.62886 1.8750 0.62010 1.0000 0.62292 1.0000 0.76194
No. 33 0.6240 0.5605
… … … … …
a These dimensions are for the No. 2 “short” taper. Thread Size Diameter D Max. Min. Max.
Diameter E
Dimension F
Min.
Max. 0.135 0.135 0.135 0.135 0.166 0.166 0.166 0.166 0.281 0.281 0.343
Min.
0.531 0.633 0.633 0.860 1.125 1.125 1.250 1.250 1.437 1.437 1.871
0.516 0.618 0.618 0.845 1.110 1.110 1.235 1.235 1.422 1.422 1.851
0.3245 0.3245 0.385 0.510
0.3195 0.3195 0.380 0.505 0.630 0.630 0.708 0.755 1.026 1.026 1.526
0.115 0.115 0.115 0.115 0.146 0.146 0.146 0.146 0.250 0.250 0.312
5 ⁄ 16 -24 5 ⁄ 16 -24 3 ⁄ 8 -24 1 ⁄ 2 -20 5 ⁄ 8 -11 5 ⁄ 8 -16 45 ⁄ 64 -16 3 ⁄ 4 -16
0.635 0.635 0.713 0.760 1.036 1.036 1.536
1-8 1-10
1 1 ⁄ 2 -8
Plug Gage Pitch Dia.
Ring Gage Pitch Dia.
G
Thread a Size 5 ⁄ 16 -24 3 ⁄ 8 -24 1 ⁄ 2 -20 5 ⁄ 8 -11 5 ⁄ 8 -16 45 ⁄ 64 -16 3 ⁄ 4 -16
Max.
Min.
Go
Not Go 0.2902 0.3528 0.4731 0.5732 0.5906 0.6687 0.7159 0.9242 0.9395 1.4242
Go
Not Go 0.2806 0.3430 0.4619 0.5589 0.5782 0.6561 0.7029 0.9134 0.9305 1.4134
H b
0.3114 0.3739 0.4987 0.6234 0.6236 0.7016 0.7485 1.000 1.000 1.500
0.3042 0.3667 0.4906 0.6113 0.6142 0.6922 0.7391 0.9848 0.9872 1.4848
0.437 c 0.562 d 0.562 0.687 0.687 0.687 0.687 1.000 1.000 1.000
0.2854 0.3479 0.4675 0.5660 0.5844 0.6625 0.7094 0.9188 0.9350 1.4188
0.2843 0.3468 0.4662 0.5644 0.5830 0.6610 0.7079 0.9188 0.9350 1.4188
1-8 1-10
1 1 ⁄ 2 -8
a Except for 1-8, 1-10, 1 1 ⁄ 2 -8, all threads are now manufactured to the American National Standard Unified Screw Thread System, Internal Class 2B, External Class 2A. Effective date 1976. b Tolerances for dimension H are as follows: 0.030 inch for thread sizes 5 ⁄ 16 -24 to 3 ⁄ 4 -16, inclusive, and 0.125 inch for thread sizes 1-8 to 1 1 ⁄ 2 -8, inclusive. c Length for Jacobs 0B5 ⁄ 16 chuck is 0.375 inch, length for 1B5 ⁄ 16 chuck is 0.437 inch. d Length for Jacobs No. 1BS chuck is 0.437 inch. Usual Chuck Capacities for Different Taper Series Numbers: No. 0 taper, drill diameters, 0- 5 ⁄ 32 inch; No. 1, 0- 1 ⁄ 4 inch; No. 2, 0- 1 ⁄ 2 inch; No. 2 “Short,” 0- 5 ⁄ 16 inch; No. 3, 0- 1 ⁄ 2 , 1 ⁄ 8 - 5 ⁄ 8 , 3 ⁄ 16 - 3 ⁄ 4 , or 1 ⁄ 4 - 13 ⁄ 16 inch; No. 4, 1 ⁄ 8 - 3 ⁄ 4 inch; No. 5, 3 ⁄ 8 -1; No. 6, 0- 1 ⁄ 2 inch; No. 33, 0- 1 ⁄ 2 inch. Usual Chuck Capacities for Different Thread Sizes: Size 5 ⁄ 16 -24, drill diameters 0- 1 ⁄ 4 inch; size 3 ⁄ 8 -24, drill diameters 0- 3 ⁄ 8 , 1 ⁄ 16 - 3 ⁄ 8 , or 5 ⁄ 64 - 1 ⁄ 2 inch; size 1 ⁄ 2 -20, drill diameters 0- 1 ⁄ 2 , 1 ⁄ 16 - 3 ⁄ 8 , or 5 ⁄ 64 - 1 ⁄ 2 inch; size 5 ⁄ 8 -11, drill diameters 0- 1 ⁄ 2 inch; size 5 ⁄ 8 -16, drill diameters 0- 1 ⁄ 2 , 1 ⁄ 8- - 5 ⁄ 8 , or 3 ⁄ 16 - 3 ⁄ 4 inch; size 45 ⁄ 64 -16, drill diameters 0- 1 ⁄ 2 inch; size 3 ⁄ 4 -16, drill diameters 0- 1 ⁄ 2 or 3 ⁄ 16 - 3 ⁄ 4 .
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