Modified Stock Gearing - Boston Gear

Internal Gears
64 through 24 Diametral Pitch (Brass)
20° Pressure Angle (will not operate with 14-1⁄2° spurs)
ALL DIMENSIONS IN INCHES
ORDER BY CATALOG NUMBER OR ITEM CODE
No. of Pitch Catalog Item
Teeth Dia. O.D. I.D. Number Code
64
DIAMETRAL PITCH FACE WIDTH - .125”
64 1.000 1.500 .980 YI6464 12030
96 1.500 2.000 1.480 YI6496 12032
128 2.000 2.750 1.980 YI64128 12034
192 3.000 3.750 2.980 YI64192 12036
48
DIAMETRAL PITCH FACE WIDTH - .125”
48 1.000 1.500 .974 YI4848 12020
72 1.500 2.000 1.474 YI4872 12022
96 2.000 2.750 1.974 YI4896 12024
144 3.000 3.750 2.974 YI48144 12026
192 4.000 4.750 3.974 YI48192 12028
32
DIAMETRAL PITCH FACE WIDTH - .188”
48 1.500 2.000 1.461 YI3248 12010
64 2.000 2.750 1.961 YI3264 12012
96 3.000 3.750 2.961 YI3296 12014
128 4.000 4.750 3.961 YI32128 12016
192 6.000 6.750 5.961 YI32192 12018
24
DIAMETRAL PITCH FACE WIDTH - .250”
36 1.500 2.250 1.450 YI2436 12000
48 2.000 2.750 1.950 YI2448 12002
72 3.000 3.750 2.950 YI2472 12004
96 4.000 4.750 3.950 YI2496 12006
144 6.000 6.750 5.950 YI24144 12008
A
FACE
PITCH
DIA.
INSIDE
DIA.
OUTSIDE
DIA.
STANDARD TOLERANCES
DIMENSION TOLERANCE
64 Pitch All +.004 – .000
I.D. 48 Pitch
32 Pitch
All
All
+.005 – .000
+.006 – .000
24 Pitch All +.008 – .000
O.D. All +.001 + .003
NOTE: The difference in tooth numbers between Gear and Pinion should not be less than 12.
PINION
PITCH DIA.
(d)
GEAR
PITCH DIA.
(D)
CENTER DISTANCE
CENTER
DISTANCE =
D – d
2
48 Boston Gear 800-825-6544 P-1930-BG 04/10