Modified Stock Gearing - Boston Gear

Spur Gears
6 and 5 Diametral Pitch (Steel & Cast Iron)
14-1/2° Pressure Angle (will not operate with 20° spurs)
A
FACE
PITCH
DIA.
HUB
PROJ.
BORE
OVERALL
LENGTH
STANDARD TOLERANCES
DIMENSION TOLERANCE
BORE All ±.0005
6 D.P. 5 D.P.
HUB
DIA.
ALL DIMENSIONS IN INCHES
ORDER BY CATALOG NUMBER OR ITEM CODE
Style Without Keyway
No. Hub See or Setscrew
of Pitch Page Catalog Item
Teeth Dia. Bore Dia. Proj. 315 Number Code
6
Face = 1.500˝
Outside Dia. = Pitch Dia + .333˝
DIAMETRAL PITCH
Overall Length = 1.500˝ + Hub Proj.
CAST IRON
32 5.333 NJ32 10420
33 5.500 B NJ33 10422
36 6.000 NJ36 10424
40
42
6.667
7.000
1.125 2.50 1.00
C
NJ40
NJ42
10426
10428
48 8.000 NJ48 10430
54 9.000 NJ54 10432
60 10.000 NJ60 10434
64 10.667
3.00
NJ64 10436
66 11.000 NJ66 10438
72 12.000 1.25 D NJ72 10440
84 14.000 1.250 NJ84 10442
96 16.000 3.25 NJ96 10444
108 18.000 NJ108 10446
120 20.000 3.50
1.50
NJ120B 10448
144 24.000 3.75 NJ144B 10452
5
Face = 1.750"
Outside Dia. = Pitch Dia. + .400"
DIAMETRAL PITCH
Overall Length = 1.750" + Hub Proj.
STEEL
11 2.400 * 1.78 NK11B 09846
12 2.400 1.78 NK12B 09848
14 2.800 2.18 NK14B 09850
15 3.000 1.0625 2.38 .88 A NK15B 09852
16 3.200 2.58 NK16B 09854
18 3.600 2.98 NK18B 09856
20 4.000 3.38 NK20B 09858
CAST IRON
24 4.800 A NK24B 10454
25 5.000 1.0625 3.00 1.25 NK25B 10456
30 6.000 NK30B 10458
35 7.000 B NK35B 10460
40 8.000 1.1875 3.00 1.25 NK40B 10462
45 9.000 NK45B 10464
50 10.000 NK50B 10466
55 11.000 NK55B 10468
60
70
12.000
14.000
1.1875 3.50 1.25
D
NK60B
NK70B
10470
10472
80 16.000 NK80B 10474
100 20.000 1.3125 3.75 1.50 NK100B 10478
*Special Pitch Diameter, used for calculating Center Distance only, not Ratio.
REFERENCE PAGES
Alterations — 314
Horsepower Ratings — 56
Lubrication — 314
Materials — 315
Selection Procedure — 49
26 Boston Gear 800-825-6544 P-1930-BG 04/10