20 DP gears are the most common gears used in FIRST Robotics Competition gearboxes.

Description
Specifications
Documentation

Want to replace one of your existing gears? Building a custom gearbox? This page is a hub for all of our standard width, symmetrical 3/8 hex and 1/2 inch hex bore 20 DP gears.

Check out our other 20 DP Gear pages for Pinion Gears and Shifting Gears and other special gears like those for the Toughbox line.

Part Number	Tooth Count	Hex Bore (in.)	Outside Dia (in.)	Pitch Dia (in.)	Weight (lbs)
am-3484	14	0.375	0.80	0.70	0.03
am-4389	15	0.375	0.85	0.75	0.03
am-4665	16	0.375	0.90	0.80	0.05
am-4390	17	0.375	0.95	0.85	0.07
am-3534	18	0.375	1.00	0.90	0.05
am-4212	18	0.500	1.00	0.90	0.05
am-3645	19	0.375	1.05	0.95	0.07
am-5131	19	0.500	1.05	0.95	0.06
am-4213	20	0.500	1.10	1.00	0.06
am-3820	20	0.375	1.10	1.00	0.07
am-3646	21	0.375	1.15	1.05	0.08
am-5132	21	0.500	1.15	1.05	0.07
am-3485	24	0.375	1.30	1.20	0.11
am-4214	24	0.500	1.30	1.20	0.11
am-3535	25	0.500	1.35	1.25	0.11
am-4391	25	0.375	1.35	1.25	0.10
am-3647	28	0.375	1.50	1.40	0.15
am-5133	28	0.500	1.50	1.40	0.14
am-4392	28	0.375	1.50	1.40	0.11
am-5134	29	0.375	1.55	1.45	0.11
am-5135	29	0.500	1.55	1.45	0.15
am-3536	30	0.375	1.60	1.50	0.11
am-4215	30	0.500	1.60	1.50	0.11
am-3815	32	0.500	1.70	1.60	0.11
am-5136	32	0.375	1.70	1.60	0.11
am-3537	34	0.375	1.80	1.70	0.13
am-5137	34	0.500	1.80	1.70	0.14
am-4186	35	0.375	1.85	1.75	0.14
am-3486	35	0.500	1.85	1.75	0.15
am-5147	35	0.500	1.85	1.75	0.05
am-5146	35	0.375	1.85	1.75	0.05
am-3816	36	0.500	1.90	1.80	0.15
am-4709	36	0.500	1.90	1.80	0.25
am-5138	36	0.375	1.90	1.80	0.13
am-3538	38	0.375	2.00	1.90	0.15
am-3718	38	0.500	2.00	1.90	0.15
am-3976	40	0.375	2.10	2.00	0.17
am-3487	40	0.500	2.10	2.00	0.18
am-4710	40	0.500	2.10	2.00	0.32
am-5148	40	0.500	2.10	2.00	0.06
am-4393	43	0.500	2.25	2.15	0.21
am-5139	43	0.375	2.25	2.15	0.19
am-5149	43	0.375	2.25	2.15	0.07
am-4711	43	0.500	2.25	2.15	0.37
am-5151	43	0.500	2.25	2.15	0.07
am-4394	45	0.500	2.35	2.25	0.20
am-4712	45	0.500	2.35	2.25	0.41
am-5140	45	0.375	2.35	2.25	0.20
am-5152	45	0.375	2.35	2.25	0.07
am-5153	45	0.500	2.35	2.25	0.07
am-5141	46	0.375	2.40	2.30	0.19
am-3819	46	0.500	2.40	2.30	0.19
am-4713	46	0.500	2.40	2.30	0.43
am-4395	48	0.500	2.50	2.40	0.26
am-4714	48	0.500	2.50	2.40	0.48
am-5142	48	0.375	2.50	2.40	0.22
am-3488	50	0.500	2.60	2.50	0.25
am-4715	50	0.500	2.60	2.50	0.50
am-4367	50	0.375	2.60	2.50	0.24
am-4720	50	0.375	2.60	2.50	0.51
am-5154	50	0.375	2.60	2.50	0.08
am-5155	50	0.500	2.60	2.50	0.09
am-4733	52	0.375	2.70	2.60	0.02
am-3821	52	0.500	2.70	2.60	0.23
am-3822	56	0.500	2.90	2.80	0.27
am-5156	56	0.375	2.90	2.80	0.01
am-5143	56	0.375	2.90	2.80	0.27
am-5157	56	0.500	2.90	2.80	0.10

- Bore: 0.501 - 0.507 in. Hex, 0.376 - 0.381 in. Hex
- Diametral Pitch: 20
- Face Width: 0.375 in.
- Finish: Zinc Plated
- Material: 4140 Steel
- Width: 0.500 in.