Spur Gears: 3 Diametral Pitch Ratings

14-1/2° and 20° Pressure Angle*

3″ Face

Steel Spur Gears with Hubs

Number of Teeth Pitch diameter Outside Diameter Stock Bore Maximum Bore Hub Diameter Hub Projection Style Catalog Number
14-1/2° P.A. 20° P.A.
11† 4.000 4.666 1-5/16″ 1-3/4″ None None Plain SS-311 n/a
12 4.000 4.666 1-5/16″ 1-3/4″ None None Plain SS-312 n/a
14 4.666 5.333 1-5/16″ 2-1/4″ None None Plain SS-314 n/a
15 5.000 5.666 1-5/16″ 2-1/2″ None None Plain SS-315 n/a
16 5.333 6.000 1-5/16″ 2-3/4″ None None Plain SS-316 n/a
18 6.000 6.666 1-5/16″ 3″ None None Plain SS-318 n/a
20 6.666 7.333 1-5/16″ 3-1/4″ None None Plain SS-320 n/a
21 7.000 7.666 1-5/16″ 3-1/2″ None None Plain SS-321 n/a

Cast Iron Spur Gears with Hubs

Number of Teeth Pitch diameter Outside Diameter Stock Bore Maximum Bore Hub Diameter Hub Projection Style Catalog Number
14-1/2° P.A. 20° P.A.
24 8.000 8.666 1-7/16″ 2-1/2″ 4-1/2″ 1-1/4″ Web IS-324 n/a
30 10.000 10.666 1-7/16″ 3″ 5-1/4″ 1-1/4″ Web IS-330 n/a
32 10.666 11.333 1-7/16″ 3″ 5-1/4″ 1-1/4″ Web IS-332 n/a
36 12.000 12.666 1-7/16″ 3″ 5-1/4″ 1-3/4″ Web IS-336 n/a
40 13.333 14.000 1-7/16″ 3″ 5-1/4″ 1-3/4″ Web IS-340 n/a
42 14.000 14.666 1-7/16″ 3″ 5-1/4″ 1-3/4″ Web IS-342 n/a
48 16.000 16.666 1-9/16″ 3″ 5-1/4″ 1-3/4″ Spoke IS-348 n/a
54 18.000 18.666 1-9/16″ 3″ 5-1/4″ 1-3/4″ Spoke IS-354 n/a
60 20.000 20.666 1-9/16″ 3″ 5-1/4″ 1-3/4″ Spoke IS-360 n/a
72 24.000 24.666 1-11/16″ 3-1/8″ 5-1/2″ 1-3/4″ Spoke IS-372 n/a
84 28.000 28.666 1-11/16″ 3-1/4″ 5-3/4″ 1-3/4″ Spoke IS-384 n/a
90 30.000 30.666 1-11/16″ 3-1/4″ 5-3/4″ 1-3/4″ Spoke IS-390 n/a
96 32.000 32.666 1-15/16″ 3-1/4″ 5-3/4″ 1-3/4″ Spoke IS-396 n/a
108 36.000 36.666 1-15/16″ 3-1/4″ 5-3/4″ 1-3/4″ Spoke IS-3108 n/a
120 40.000 40.666 1-15/16″ 3-1/2″ 6″ 1-3/4″ Spoke IS-3120 n/a
† Special Pitch Diameter.