Standard 20DP Gears (1/2 in Hex, Steel, 40 Tooth)

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

MFR Part #: am-4710

$25.00

Out of Stock - on backorder and will be dispatched once in stock.

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Specifications
Reviews

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
am-4665	16	0.375	0.90	0.80	0.05
am-4390	17	0.375	0.95	0.85
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-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-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
am-3647	28	0.375	1.50	1.40
am-4392	28	0.375	1.50	1.40
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-3537	34	0.375	1.80	1.70	0.13
am-4186	35	0.375	1.85	1.75	0.14
am-3486	35	0.500	1.85	1.75	0.15
am-3816	36	0.500	1.90	1.80	0.15
am-4709	36	0.500	1.90	1.80	0.25
am-3538	38	0.375	2.00	1.90	0.15
am-3718	38	0.500	2.00	1.90
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-4393	43	0.500	2.25	2.15	0.21
am-4711	43	0.500	2.25	2.15	0.37
am-4394	45	0.500	2.35	2.25	0.20
am-4712	45	0.500	2.35	2.25	0.41
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-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-4733	52	0.375	2.70	2.60
am-3821	52	0.500	2.70	2.60	0.23
am-3822	56	0.500	2.90	2.80	0.27

Specifications

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.

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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
am-4665	16	0.375	0.90	0.80	0.05
am-4390	17	0.375	0.95	0.85
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-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-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
am-3647	28	0.375	1.50	1.40
am-4392	28	0.375	1.50	1.40
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-3537	34	0.375	1.80	1.70	0.13
am-4186	35	0.375	1.85	1.75	0.14
am-3486	35	0.500	1.85	1.75	0.15
am-3816	36	0.500	1.90	1.80	0.15
am-4709	36	0.500	1.90	1.80	0.25
am-3538	38	0.375	2.00	1.90	0.15
am-3718	38	0.500	2.00	1.90
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-4393	43	0.500	2.25	2.15	0.21
am-4711	43	0.500	2.25	2.15	0.37
am-4394	45	0.500	2.35	2.25	0.20
am-4712	45	0.500	2.35	2.25	0.41
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-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-4733	52	0.375	2.70	2.60
am-3821	52	0.500	2.70	2.60	0.23
am-3822	56	0.500	2.90	2.80	0.27

Specifications

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.