Modified Stock Gearing - Boston Gear

Rack
20 through 4 Diametral Pitch (Steel)
20° Pressure Angle (will not operate with 14-1⁄2° spurs)
ALL DIMENSIONS IN INCHES
ORDER BY CATALOG NUMBER OR ITEM CODE
Pitch Line Nominal Mating Steel
Overall to Back Length Spur Gear Catalog Item
Thickness (B) (Feet) Page No. Number Code
20
DIAMETRAL PITCH FACE WIDTH - .500”
16
.500 .450
4
42
L2020-4 12758
6 L2020-6 12760
DIAMETRAL PITCHFACE WIDTH - .750”
.750 .688
4
L2016-4 12762
43
6 L2016-6 12764
12
DIAMETRAL PITCH FACE WIDTH - 1.000”
1.000 .917
4
43 – 44
L2012-4 37320
6 L2012-6 37322
10
DIAMETRAL PITCH FACE WIDTH - 1.250”
1.250 1.150
4
44
L2010-4 37316
6 L2010-6 37318
8
DIAMETRAL PITCH FACE WIDTH - 1.500”
1.500 1.375
4
45
L208-4 37312
6 L208-6 37314
6
DIAMETRAL PITCH FACE WIDTH - 2.000”
1.500 1.333
4
45 – 46
L206-4 37308
6 L206-6 37310
5
DIAMETRAL PITCH FACE WIDTH - 2.500”
1.500 1.300
4
46
L205-4 37304
6 L205-6 37306
4
DIAMETRAL PITCH FACE WIDTH - 3.500”
2.000 1.750
4
–
L204-4 37300
6 L204-6 37302
PITCH LINE
TO BACK
(B)
LENGTH
WIDTH
OVERALL
THICKNESS
STANDARD TOLERANCES
DIMENSION TOLERANCE
LENGTH † All +1.000 – .000
1/2 – 3/4 +.000 – .002
FACE 1 – 1-1/2 +.000 – .003
WIDTH 2 – 2-1/2 +.000 – .004
3-1/2 +.000 – .006
†Ends not machined. Tolerance allows for cutting and
matching.
A
PITCH DIA
OF GEAR
(D)
GEAR
CENTER LINE
TO BACK OF RA
B + D
2
CK
FACE
WIDTH
OVERALL
THICKNESS
LENGTH
PITCH LINE
TO BACK
(B)
REFERENCE PAGES
Alterations — 314
Lubrication — 314
Materials — 315
P-1930-BG 04/10 Boston Gear 800-825-6544 47