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    Standard 20DP Gears (1/2 in Hex, Steel, 48 Tooth, Weight Relieved)

    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-4395
    $32.00
    Availability: 4 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.
    Customers who bought this item also bought

    2" Compliant Wheel, 1/2 inch Hex, 35 Durometer Green

    #am-3462_green
    $8.00
    (72 In stock)

    Compliant wheels are not intended for moving robots, but moving objects. Compliant wheels give way to allow rigid objects to be manipulated easily. A line of multiple wheels on a driven hex shaft creates a very effective roller that ignores variations in the objects being driven. This makes for high-performance intakes and internal conveyors. The wheels are sized for an interference fit and tend to stay in place on a shaft, though a shaft collar may be used to make absolutely sure the wheels stay clear of other mechanisms or maintain consistent spacing.

     

    The hex bore versions of this wheel are undersized, and are intended to be an interference fit on their respective hex shafts. This interference fit allows for effective torque transfer from the hex shaft to the wheel, as well as allowing the wheel to remain in place along the shaft without the need for spacers or collar clamps:

     

    Compliant Wheel Sizing

     

    Different durometer ratings give each wheel unique characteristics. Green wheels (35A durometer) are the softest and most compliant around objects, while orange (40A), maroon (45A), and blue (50A) wheels are increasingly firm. The increased firmness also allows the latter wheels to carry a higher RPM rating. Check out the downloads tab for a chart showing wheels and their maximum RPM. 

     

     

    Specifications

     

    • Bore: 1/2 in. Hex, 3/8 in. Hex, Nub Bore
    • Diameter: 2 in.
    • Durometer: 35A (Green), ⠀40A (Orange), ⠀45A (Maroon), ⠀50A (Blue), 60A (Black)
    • Hole Pattern: Qty 2 3.5 mm Holes on a 16 mm Circle for 8 mm bore wheels
    • Material: TPU
    • Maximum RPM: 6000 - 9000
    • Weight: 0.035 lb.
    • Width: 0.5 in.

     

    Documents

    Layout Print(s)

    am-3571 2IN 375 Hex Compliant Wheel REV3.PDF

    am-3462 2IN 500Hex Compliant Wheel REV3.PDF

    am-3572 2IN 8mm Compliant Wheel REV4.PDF

    CAD File(s)

    am-3571 2IN 375Hex Compliant Wheel REV2.STEP

    am-3572 2IN 8mm Compliant Wheel REV2.STEP

    am-3462 2IN Molded 500Hex Compliant Wheel REV2.STEP

    Additional File(s)

    2 inch Compliant Wheel Expansion.pdf

    Don't see what you need?

    CIM Sport Gearbox 12:1 HD Ratio

    #am-4008_012
    $149.00
    (2 In stock)

    The CIM Sport is a competition tested high performance line of planetary gearboxes from AndyMark and BaneBots. The CIM Sport features numerous improvements over previous planetary gearboxes used on FIRST Robotics Competition robots. 

    CIM Sport Gearbox 48:1 HD Ratio

    #am-4008_048
    $174.00
    (0 In stock)

    The CIM Sport is a competition tested high performance line of planetary gearboxes from AndyMark and BaneBots. The CIM Sport features numerous improvements over previous planetary gearboxes used on FIRST Robotics Competition robots. 

    CIM Sport Gearbox 80:1 HD Ratio

    #am-4008_080
    $179.00
    (In stock)

    The CIM Sport is a competition tested high performance line of planetary gearboxes from AndyMark and BaneBots. The CIM Sport features numerous improvements over previous planetary gearboxes used on FIRST Robotics Competition robots. 

    Climber in a Box - 2 Stage

    #am-4668
    $324.00
    (3 In stock)

    The AndyMark Climber in a Box is a robust, lightweight, configurable and affordable solution for climbing challenges historically present in FRC end game periods. The design of Climber in a Box has been inspired by many team designs along the way including 254 and 2056. The final prototype for this climber was developed in partnership with FRC Team 3940 CyberTooth for the 2020/2021 Infinite Recharge season. This mechanism has been battle tested with hundreds of climbs on a full weight FRC Robot without failures, both in development and real match play. Available in single and two stage configurations, this product should help teams of all levels elevate their team's performance at competitions.

     

    This product uses a "spring out, winch back" powertrain strategy, using off-the-shelf 3.5lb constant force springs to raise the included Hook Kit, and 3mm Dyneema Rope to retract it with the included Winch Kit. Simply unspool the included rope using a planetary gearbox to raise the hook(s), drive the robot up to the bar, and winch it back to elevate your robot. The AndyMark Climber in a Box does not include a motor or gearbox, but is compatible with many off-the-shelf planetary gearboxes on the market that have a 2" bolt circle mounting pattern and support a 2" long 1/2" hex output shaft, including the highly durable blue Sport Gearboxes.

     

    The bearing kits within this product are designed to go from 2" square 1/16" wall aluminum tubing, down to a 1" square 1/16" wall tube, with a 1.5" square 1/16" wall tube in between for the 2 stage flavor of this product. A combination of durable 608 bearings and custom molded plastic components provide the bearing surfaces for a free-flowing telescoping tube mechanism with no 3D printed parts. Each stage has a maximum travel of 24.5."

     

    The AndyMark Climber in a Box is an unassembled kit of everything you need (besides a gearmotor) that is designed to not require any precision machining in order to make your FRC robot climb. The plates included within the Hook Kit, Bearing Kits and Winch Kit are all designed to be assembled and used as drill guides for match drilling their mounting locations onto the aluminum tubes. Each tube is pre-cut to a 30" length so no cutting of the tubes is required to achieve maximum travel.

     

    Watch the teaser video here