Spur Gears: 12 Diametral Pitch Ratings

14-1/2° and 20° Pressure Angle*
3/4″ 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†◊ 1.000 1.166 1/2″ 1/2″ 25/32″ 1/2″ Plain ST-1211 TST-1211
11† 1.000 1.166 1/2″ 1/2″ 3/4″ 1/2″ Plain ST-1211-B TST-1211-B
12◊ 1.000 1.166 1/2″ 1/2″ 25/32″ 1/2″ Plain ST-1212 TST-1212
12 1.000 1.166 1/2″ 1/2″ 3/4″ 1/2″ Plain ST-1212-B TST-1212-B
13◊ 1.083 1.250 1/2″ 9/16″ 27/32″ 1/2″ Plain ST-1213 TST-1213
13 1.083 1.250 1/2″ 9/16″ 13/16″ 1/2″ Plain ST-1213-B TST-1213-B
14◊ 1.166 1.333 1/2″ 5/8″ 15/16″ 1/2″ Plain ST-1214 TST-1214
14 1.166 1.333 1/2″ 5/8″ 29/32″ 1/2″ Plain ST-1214-B TST-1214-B
15 1.250 1.416 5/8″ 11/16″ 1″ 1/2″ Plain ST-1215 TST-1215
16◊ 1.333 1.500 5/8″ 3/4″ 1-3/32″ 1/2″ Plain ST-1216 TST-1216
16 1.333 1.500 5/8″ 3/4″ 1-1/16″ 1/2″ Plain ST-1216-B TST-1216-B
18 1.500 1.666 5/8″ 13/16″ 1-1/4″ 1/2″ Plain ST-1218 TST-1218
20◊ 1.666 1.833 5/8″ 15/16″ 1-7/16″ 1/2″ Plain ST-1220 TST-1220
20 1.666 1.833 5/8″ 15/16″ 1-13/32″ 1/2″ Plain ST-1220-B TST-1220-B
21 1.750 1.916 5/8″ 1″ 1-1/2″ 1/2″ Plain ST-1221 TST-1221
22 1.833 2.000 5/8″ 1-1/16″ 1-9/16″ 1/2″ Plain ST-1222 TST-1222
24◊ 2.000 2.166 5/8″ 1-1/8″ 1-11/16″ 1/2″ Plain ST-1224 TST-1224
24 2.000 2.166 5/8″ 1-1/8″ 1-3/4″ 1/2″ Plain ST-1224-B TST-1224-B
30◊ 2.500 2.666 5/8″ 1-1/8″ 1-3/4″ 5/8″ Plain ST-1230 TST-1230
30 2.500 2.666 5/8″ 1-1/8″ 2-1/4″ 5/8″ Plain ST-1230-B TST-1230-B
36~ 3.000 3.166 5/8″ 1-5/16″ 2″ 5/8″ Plain ST-1236 TST-1236
42~ 3.500 3.666 5/8″ 1-5/16″ 2″ 5/8″ Plain ST-1242 TST-1242
48~ 4.000 4.166 3/4″ 1-5/16″ 2″ 5/8″ Plain ST-1248 TST-1248
54~ 4.500 4.666 3/4″ 1-1/2″ 2-1/4″ 5/8″ Plain ST-1254 TST-1254
60~ 5.000 5.166 3/4″ 1-1/2″ 2-1/4″ 5/8″ Plain ST-1260 TST-1260
72~ 6.000 6.166 3/4″ 1-1/2″ 2-1/4″ 5/8″ Plain ST-1272 TST-1272

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.
36~ 3.000 3.166 5/8″ 13/16″ 1-1/2″ 5/8″ Web IS-1236 TIS-1236
40~ 3.333 3.500 5/8″ 13/16″ 1-1/2″ 5/8″ Web IS-1240 TIS-1240
42~ 3.500 3.666 5/8″ 13/16″ 1-1/2″ 5/8″ Web IS-1242 TIS-1242
48~ 4.000 4.166 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1248 TIS-1248
54~ 4.500 4.666 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1254 TIS-1254
60~ 5.000 5.166 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1260 TIS-1260
64~ 5.333 5.500 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1264 TIS-1264
72~ 6.000 6.166 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1272 TIS-1272
84 7.000 7.166 3/4″ 1″ 1-3/4″ 3/4″ Spoke IS-1284 TIS-1284
96 8.000 8.166 3/4″ 1-1/8″ 2″ 3/4″ Spoke IS-1296 TIS-1296
108 9.000 9.166 3/4″ 1-1/8″ 2″ 3/4″ Spoke IS-12108 TIS-12108
120 10.000 10.166 7/8″ 1-5/16″ 2-3/8″ 3/4″ Spoke IS-12120 TIS-12120
144 12.000 12.166 7/8″ 1-7/16″ 2-1/2″ 1″ Spoke IS-12144 TIS-12144
168 14.000 14.166 7/8″ 1-7/16″ 2-1/2″ 1″ Spoke IS-12168 TIS-12168
192 16.000 16.166 7/8″ 1-7/16″ 2-1/2″ 1″ Spoke IS-12192 TIS-12192

† Special Pitch Diameter.

◊ Obsolete Style – Available only from existing stock.

* 14-1/2° Pressure Angle will not operate with 20° Pressure Angle.

~ Available in Cast Iron or Steel.