Modified Stock Gearing - Boston Gear

Roller Chain Sprockets
Single Strand
No. 40 1/2" Pitch; Stainless Steel
P.D.
.284
MAX.
ORDER BY CATALOG NUMBER OR ITEM CODE
Without Keyway
No.
or Setscrew
of Pitch Bore Hub Length
Teeth Dia. Dia. thru Catalog Item
Number Code
TYPE B SINGLE HUB STAINLESS STEEL
10 1.618 1-1/4† 40B10SS 69275
11 1.775 1-3/8† 40B11SS 69276
12 1.932 1/2 1-9/16† 7/8 40B12SS 69277
13 2.089 1-9/16 40B13SS 69278
14 2.247 1-11/16 40B14SS 69279
15 2.405
1-13/16
40B15SS 69280
5/8
7/8
16 2.563 2 40B16SS 69281
17 2.721 2-1/8 40B17SS 69282
18 2.879 2-5/16 40B18SS 69283
19 3.038 2-1/2 40B19SS 69294
20 3.196 5/8 2-5/8 1 40B20SS 69295
25 3.989 3-1/4 40B25SS 69296
30 4.783 3-1/4 40B30SS 69297
40 6.373 3-1/2 40B40SS 69300
45 7.168 3/4 3-1/2 1 40B45SS 69301
60 9.554 3-1/2 40B60SS 69302
†Has recessed groove in hub for chain reference.
H
Double Strand
No. 40 2-1/2" Pitch; Steel
P.D.
.841
.395
.275
MAX
ORDER BY CATALOG NUMBER OR ITEM CODE
Without Keyway
No.
or Setscrew
of Pitch Bore Hub Length
Teeth Dia. Dia. thru Catalog Item
Number Code
TYPE B SINGLE HUB STEEL
13 2.089 1-1/2 D40B13 46563
14 2.247 1/2 1-11/16 1-1/2 D40B14 46564
15 2.405 1-13/126 D40B15 46565
16 2.563 2 D40B16 15950
17 2.721 1/2 2-1/8 1-1/2 D40B17 15952
18 2.879 2-5/16 D40B18 15954
19 3.038 2-1/2 D40B19 15956
20 3.196 2-5/8 D40B20 15958
21 3.355 2-3/4 D40B21 15960
22 3.513
2-7/8
D40B22 15962
5/8
1-5/8
23 3.672 3 D40B23 15964
24 3.831 3-1/4 D40B24 15966
25 4.989 3-1/4 D40B25 15968
26 4.148 3-1/4 D40B26 68011
30 4.783
7/8
2-1/2
1-5/8
D40B30 68012
35 5.578 3-1/4 D40B35 68013
36 5.737
3-3/4 1-5/8 D40B36 68018
15/16
40 6.373 3-3/4 1-3/4 D40B40 68020
MAXIMUM DIA. OF CHAIN OVER
SPROCKET = SPROCKET P.D. +.469”
STANDARD TOLERANCES
Dimension
Tolerance
Stainless Steel
Bore All +.002 —.000
Double Strand
Bore All ±,001
Reference Pages
Alterations – 316
Horsepower Ratings – 260-262
Lubrication – 259
Materials – 316
Selection Procedure – 258
ANSI Diameters – 317
278 Boston Gear 800-825-6544 P-1930-BG 04/10