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    Standard 20DP Gears (1/2 in Hex, Steel, 50 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-4715
    $32.00
    Availability: 10 in stock
    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.