Modified Stock Gearing - Boston Gear
Modified Stock Gearing - Boston Gear
Modified Stock Gearing - Boston Gear
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Roller Chain Sprockets<br />
Single Strand<br />
No. 25 1/4" Pitch; Steel and Stainless Steel<br />
H<br />
P.D.<br />
Reference Pages<br />
.110<br />
MAX.<br />
MAXIMUM DIA. OF CHAIN OVER<br />
SPROCKET = SPROCKET P.D. +.234”<br />
STANDARD TOLERANCES<br />
Dimension<br />
Tolerance<br />
Bore All ±.001<br />
Alterations – 316<br />
Horsepower Ratings – 260-262<br />
Lubrication – 259<br />
Materials – 316<br />
Selection Procedure – 258<br />
ANSI Diameters – 317<br />
*Sprockets 28 and 30 teeth have 10-32<br />
setscrews. 32-72 teeth 1/4-20 setscrews.<br />
ORDER BY CATALOG NUMBER OR ITEM CODE<br />
No. Length With Setscrew* Without Setscrew<br />
Pitch<br />
Hub<br />
of<br />
Dia.<br />
Bore<br />
Dia.<br />
thru Catalog Item Catalog Item<br />
Teeth<br />
Bore Number Code Number Code<br />
TYPE B SINGLE HUB STEEL<br />
3/8 25B25 – 3/8 45682 25B25 68191<br />
25 1.995 1/2 1-1/2 5/8 25B25 – 1/2 45683<br />
5/8 25B25 – 5/8 45684<br />
3/8 25B26 – 3/8 45685 25B26 68192<br />
26 2.074 1/2 1-1/2 5/8 25B26 – 1/2 45686<br />
5/8 25B26 – 5/8 45687<br />
3/8 25B28 – 3/8 45692 25B28 68193<br />
28 2.233 1/2 1-1/2 5/8 25B28 – 1/2 45693<br />
5/8 25B28 – 5/8 45694<br />
3/8 25B30 – 3/8 58248 25B30 15616<br />
30 2.392 1/2 1-9/32 1/2 25B30 – 1/2 58249<br />
5/8 25B30 – 5/8 58250<br />
3/4 25B30 – 3/4 58251<br />
1/2 25B32 – 1/2 67922 25B32 68204<br />
32 2.551 5/8 1-1/2 5/8 25B32 – 5/8 45695<br />
3/4 25B32 – 3/4 45696<br />
1/2 25B36 – 1/2 58252 25B36 15618<br />
36 2.868 5/8 1-1/2 3/4 25B36 – 5/8 45709<br />
3/4 25B36 – 3/4 45710<br />
1/2 25B40 – 1/2 58253 25B40 15620<br />
40 3.186 5/8 2 3/4 25B40 – 5/8 45723<br />
3/4 25B40 – 3/4 45724<br />
1/2 25B45 – 1/2 67925 25B45 68207<br />
45 3.584 5/8 2 3/4 25B45 – 5/8 45725<br />
3/4 25B45 – 3/4 45726<br />
1/2 25B48 – 1/2 58254 25B48 15622<br />
48 3.822 5/8 2 3/4 25B48 – 5/8 45727<br />
3/4 25B48 – 3/4 45728<br />
1/2 25B54 – 1/2 58255 25B54 15624<br />
54 4.300 5/8 2 3/4 25B54 – 5/8 45729<br />
3/4 25B54 – 3/4 45730<br />
1/2 25B60 – 1/2 58256 25B60 15626<br />
60 4.777 5/8 2 3/4 25B60 – 5/8 45731<br />
3/4 25B60 – 3/4 45732<br />
1/2 25B72 – 3/4 58257 25B72 15628<br />
72 5.731 5/8 2 3/4 25B72 – 5/8 45739<br />
3/4 25B72 – 3/4 45740<br />
TYPE B SINGLE HUB STAINLESS STEEL<br />
9 .731 1/4 7/16 25B9SS 69448<br />
10 .809 1/4 1/2 25B10SS 69449<br />
11 .887 1/4 9/16 25B11SS 69450<br />
12 .966 1/4 5/8 25B12SS 69451<br />
13 1.045 1/4 23/32 25B13SS 69452<br />
14 1.123 1/4 13/16 1/2 25B14SS 69453<br />
15 1.202 1/4 57/64 25B15SS 69456<br />
16 1.281 1/4 31/32 25B16SS 69467<br />
17 1.361 1/4 1-1/32 25B17SS 69468<br />
18 1.440 1/4 1-1/8 25B18SS 69469<br />
19 1.519 1/4 1-7/32 25B19SS 69470<br />
20 1.598 1/4 1-9/32 25B20SS 69471<br />
25 1.995 3/8 1-1/2 5/8 25B25SS 69472<br />
30 2.392 3/8 1-1/2 25B30SS 69473<br />
36 2.868 3/8 1-1/2 25B36SS 69474<br />
40 3.186 1/2 2 3/4 25B40SS 69475<br />
45 3.584 1/2 2 25B45SS 69476<br />
60 4.777 1/2 2 25B60SS 69477<br />
268 <strong>Boston</strong> <strong>Gear</strong> 800-825-6544 P-1930-BG 04/10
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