Spur Gears: 24 Diametral Pitch Ratings

14-1/2° and 20° Pressure Angle*

1/4″ Face

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† .500 .583 1/4″ 1/4″ 3/8″ 5/16″ Plain ST-2411 TST-2411
12 .500 .583 1/4″ 1/4″ 25/64″ 5/16″ Plain ST-2412 TST-2412
14 .583 .666 1/4″ 5/16″ 15/32″ 5/16″ Plain ST-2414 TST-2414
15 .625 .708 1/4″ 11/32″ 1/2″ 5/16″ Plain ST-2415 TST-2415
16◊ .666 .750 5/16″ 3/8″ 9/16″ 5/16″ Plain ST-2416 TST-2416
16 .666 .750 5/16″ 3/8″ 35/64″ 5/16″ Plain ST-2416-B TST-2416-B
18 .750 .833 5/16″ 7/16″ 5/8″ 5/16″ Plain ST-2418 TST-2418
20◊ .833 .916 3/8″ 1/2″ 23/32″ 5/16″ Plain ST-2420 TST-2420
20 .833 .916 5/16″ 1/2″ 23/32″ 5/16″ Plain ST-2420-B TST-2420-B
21 .875 .958 3/8″ 17/32″ 3/4″ 5/16″ Plain ST-2421 TST-2421
24 1.000 1.083 3/8″ 5/8″ 7/8″ 3/8″ Plain ST-2424 TST-2424
30 1.250 1.333 3/8″ 11/16″ 1″ 3/8″ Plain ST-2430 TST-2430
36 1.500 1.583 3/8″ 25/32″ 1-1/8″ 3/8″ Plain ST-2436 TST-2436
42 1.750 1.833 3/8″ 25/32″ 1-1/8″ 3/8″ Plain ST-2442 TST-2442
48 2.000 2.083 3/8″ 7/8″ 1-1/4″ 3/8″ Plain ST-2448 TST-2448
60 2.500 2.583 3/8″ 7/8″ 1-1/4″ 3/8″ Plain ST-2460 TST-2460
72 3.000 3.083 1/2″ 15/16″ 1-3/8″ 1/2″ Plain ST-2472 TST-2472