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    Standard 20DP Gears 1/2 in Hex, 36 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-4709
    $22.00
    10 in stock
    Part NumberTooth CountHex Bore (in.)Outside Dia (in.)Pitch Dia (in.)Weight (lbs)
    am-3484140.3750.800.700.03
    am-4389150.3750.850.75 
    am-4665160.3750.900.800.05
    am-4390170.3750.950.85 
    am-3534180.3751.000.900.05
    am-4212180.5001.000.900.05
    am-3645190.3751.050.950.07
    am-5131190.5001.050.950.06
    am-4213200.5001.101.000.06
    am-3820200.3751.101.000.07
    am-3646210.3751.151.050.08
    am-5132210.5001.151.050.07
    am-3485240.3751.301.20 
    am-4214240.5001.301.200.11
    am-3535250.5001.351.250.11
    am-4391250.3751.351.25 
    am-3647280.3751.501.40 
    am-5133280.5001.501.400.14
    am-4392280.3751.501.40 
    am-5134290.3751.551.450.11
    am-5135290.5001.551.450.15
    am-3536300.3751.601.500.11
    am-4215300.5001.601.500.11
    am-3815320.5001.701.600.11
    am-5136320.3751.701.600.11
    am-3537340.3751.801.700.13
    am-5137340.5001.801.700.14
    am-4186350.3751.851.750.14
    am-3486350.5001.851.750.15
    am-5147350.5001.851.750.05
    am-5146350.3751.851.750.05
    am-3816360.5001.901.800.15
    am-4709360.5001.901.800.25
    am-5138360.3751.901.800.13
    am-3538380.3752.001.900.15
    am-3718380.5002.001.90 
    am-3976400.3752.102.000.17
    am-3487400.5002.102.000.18
    am-4710400.5002.102.000.32
    am-5148400.5002.102.000.06
    am-4393430.5002.252.150.21
    am-5139430.3752.252.150.19
    am-5149430.3752.252.150.07
    am-4711430.5002.252.150.37
    am-5151430.5002.252.150.07
    am-4394450.5002.352.250.20
    am-4712450.5002.352.250.41
    am-5140450.3752.352.250.20
    am-5152450.3752.352.250.07
    am-5153450.5002.352.250.07
    am-5141460.3752.402.300.19
    am-3819460.5002.402.300.19
    am-4713460.5002.402.300.43
    am-4395480.5002.502.400.26
    am-4714480.5002.502.400.48
    am-5142480.3752.502.400.22
    am-3488500.5002.602.500.25
    am-4715500.5002.602.500.50
    am-4367500.3752.602.500.24
    am-4720500.3752.602.500.51
    am-5154500.3752.602.500.08
    am-5155500.5002.62.50.09
    am-4733520.3752.702.60 
    am-3821520.5002.702.600.23
    am-3822560.5002.902.800.27
    am-5156560.3752.902.800.01
    am-5143560.3752.902.800.27
    am-5157560.5002.902.800.10

    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 NumberTooth CountHex Bore (in.)Outside Dia (in.)Pitch Dia (in.)Weight (lbs)
    am-3484140.3750.800.700.03
    am-4389150.3750.850.75 
    am-4665160.3750.900.800.05
    am-4390170.3750.950.85 
    am-3534180.3751.000.900.05
    am-4212180.5001.000.900.05
    am-3645190.3751.050.950.07
    am-5131190.5001.050.950.06
    am-4213200.5001.101.000.06
    am-3820200.3751.101.000.07
    am-3646210.3751.151.050.08
    am-5132210.5001.151.050.07
    am-3485240.3751.301.20 
    am-4214240.5001.301.200.11
    am-3535250.5001.351.250.11
    am-4391250.3751.351.25 
    am-3647280.3751.501.40 
    am-5133280.5001.501.400.14
    am-4392280.3751.501.40 
    am-5134290.3751.551.450.11
    am-5135290.5001.551.450.15
    am-3536300.3751.601.500.11
    am-4215300.5001.601.500.11
    am-3815320.5001.701.600.11
    am-5136320.3751.701.600.11
    am-3537340.3751.801.700.13
    am-5137340.5001.801.700.14
    am-4186350.3751.851.750.14
    am-3486350.5001.851.750.15
    am-5147350.5001.851.750.05
    am-5146350.3751.851.750.05
    am-3816360.5001.901.800.15
    am-4709360.5001.901.800.25
    am-5138360.3751.901.800.13
    am-3538380.3752.001.900.15
    am-3718380.5002.001.90 
    am-3976400.3752.102.000.17
    am-3487400.5002.102.000.18
    am-4710400.5002.102.000.32
    am-5148400.5002.102.000.06
    am-4393430.5002.252.150.21
    am-5139430.3752.252.150.19
    am-5149430.3752.252.150.07
    am-4711430.5002.252.150.37
    am-5151430.5002.252.150.07
    am-4394450.5002.352.250.20
    am-4712450.5002.352.250.41
    am-5140450.3752.352.250.20
    am-5152450.3752.352.250.07
    am-5153450.5002.352.250.07
    am-5141460.3752.402.300.19
    am-3819460.5002.402.300.19
    am-4713460.5002.402.300.43
    am-4395480.5002.502.400.26
    am-4714480.5002.502.400.48
    am-5142480.3752.502.400.22
    am-3488500.5002.602.500.25
    am-4715500.5002.602.500.50
    am-4367500.3752.602.500.24
    am-4720500.3752.602.500.51
    am-5154500.3752.602.500.08
    am-5155500.5002.62.50.09
    am-4733520.3752.702.60 
    am-3821520.5002.702.600.23
    am-3822560.5002.902.800.27
    am-5156560.3752.902.800.01
    am-5143560.3752.902.800.27
    am-5157560.5002.902.800.10

    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

    3 inch Compliant Wheel, 1/2 inch Hex, 35A Durometer, Green

    #am-3945_green
    $12.25
    ( 12 In stock)

    You asked, we listened! These 3" diameter HD (heavy-duty) solid-core Compliant Wheels are intended for manipulating objects where you need a little 'give' in your intake system. These wheels deform out of the way to allow rigid objects to be manipulated easily. This makes for high-performance intakes and internal conveyors. These wheels do not require the use of expensive hubs to be driven, thanks to their integrated high strength polycarbonate hubs - which are made from the same mold that creates our Hex Molded Spacers.



    Different durometer ratings give each wheel unique characteristics. Green compliant wheels (35A durometer) are the softest and most compliant around objects, while maroon (45A) blue (50A) and black (60A) wheels are increasingly firm.

     

    Specifications

     

    • Bore: 0.375 in. Hex, 0.5 in. Hex, 5 mm Hex
    • Color: Green, Black, Blue, Black
    • Core Material: Polycarbonate
    • Diameter: 3 in.
    • Durometer: 35A (Green), 40A (Orange), 50A (Blue), 60A (Black)
    • Tread Material: TPU
    • Weight: 0.12 lbs
    • Overall Width: 1 in.

     

    Documents

     

    Layout Print(s)

    am-3946 3IN 375Hex Compliant Wheel REV3.PDF

    am-3945 3IN 500Hex Compliant Wheel REV3.PDF

    am-4537 3in 5mm Hex Molded Compliant Wheel.PDF

    CAD File(s)

    am-3946 3IN 375Hex Compliant Wheel REV 3.STEP

    am-3945 3IN 500Hex Compliant Wheel REV 3.STEP

    am-4537 3in 5mm Hex Molded Compliant Wheel.STEP

    Entrapption Star .5 Inch Hex Shaft

    #am-0619a
    $15.60 $20.84
    ( 52 In stock)

    Our Entrapption Stars have two bore options, making them viable parts for both FRC and FTC! This product is frequently used as intake wheels for picking up game pieces. Made from silicone, they are flexible, yet firm, allowing for the ability to pick up objects of irregular shape.

    The 1/2 in. Hex Bore option is designed to be an interference fit on any 0.5 in. Hex Shaft.  This means the bore is actually 0.425 in. and it will be a tight press on, but keep the entrapption star from rotating.

    Standard Machine Key Pack

    #am-2219
    $13.00 $13.03
    (In stock)

    Pack of spare Machine Keys.

    Included Hardware:

    • Eight - 2x2x10 mm Machine Key (am-1121) (Used in 2.5" CIM Motor shafts)
    • Four - 1/8x1/8x0700 Machine Key (am-1043) (Used in various AndyMark gearboxes)


    am-1121 Specifications:

    • Width: 2mm (0.078 inch)
    • Length: 10mm (0.394 inch)
    • Weight: 0.0008 pounds

    am-1043 Specifications:

    • Width: 1/8 inch (0.125)
    • Length: 0.70 inch
    • Weight: 0.003 pounds

    Bearing, 1/2 inch Hex Bore, Flanged, (FR8ZZ-HexHD)

    #am-2986
    $9.00 $10.42
    ( 185 In stock)

    This is a Heavy Duty Hex Bearing which outperforms our previous 1/2" Hex Bearings as it has a Heavy Duty Inner Race. This FR8ZZ-HexHD bearing, 1/2" hex bore, flanged, heavy duty inner race, shielded ball bearing, has an inner race that is thicker and stronger than our recent offering of a similar bearing (am-0279). This bearing has more material between the corners of the hex bore and the edge of the race making it stronger and much less likely to crack under high load.

    This bearing is guaranteed to have a stronger, thicker race. 100% of these bearings have been quality checked for a smooth fit over 1/2" hex stock here at AndyMark. Many of our long-time customers will recognize this bearing, as it is the same version we sold back in 2008-2011, and we did not have any failures. Now, it is renamed and quality checked for your high load needs - including drive chassis with cantilevered wheels.


    Specifications:

    • Inside diameter: 0.500-0.502 inch hex bore
    • Outside diameter: 1.125 inch
    • Flange thickness: 0.062 inch
    • Overall thickness: 0.312 inch
    • Weight: 0.05 pound

    Compliant Star 1/2 Hex 50A Durometer

    #am-5123_blue
    $16.25
    ( 46 In stock)

    Compliant Stars are the perfect thing for intake mechanisms. The soft material gives way to allow rigid objects to be manipulated easily. A line of multiple stars on a driven hex shaft creates a very effective roller that ignores variations in the objects being driven. The multiple-spoke design allows the star to act as a brush, creating more surface area to interact with and grab objects. This makes for high-performance intakes and internal conveyors. A shaft collar may be used to make absolutely sure the wheels stay clear of other mechanisms or maintain consistent spacing. Molded into the star are several guidelines. Cut the star at the lines (or elsewhere) to create more compact mechanisms. 

     

     

    Different durometer ratings give each Compliant Star unique characteristics. Green stars (35A durometer) are the softest and most compliant around objects, while orange (40A), maroon (45A), and blue (50A) wheels are increasingly firm. Black (60A) is quite firm, while the Gray (80A) is nearly rigid. The increased firmness also allows the latter wheels to carry a higher RPM rating

    Compliant Star 1/2 Hex 80A Durometer

    #am-5123_gray
    $16.25
    ( 14 In stock)

    Compliant Stars are the perfect thing for intake mechanisms. The soft material gives way to allow rigid objects to be manipulated easily. A line of multiple stars on a driven hex shaft creates a very effective roller that ignores variations in the objects being driven. The multiple-spoke design allows the star to act as a brush, creating more surface area to interact with and grab objects. This makes for high-performance intakes and internal conveyors. A shaft collar may be used to make absolutely sure the wheels stay clear of other mechanisms or maintain consistent spacing. Molded into the star are several guidelines. Cut the star at the lines (or elsewhere) to create more compact mechanisms. 

     

     

    Different durometer ratings give each Compliant Star unique characteristics. Green stars (35A durometer) are the softest and most compliant around objects, while orange (40A), maroon (45A), and blue (50A) wheels are increasingly firm. Black (60A) is quite firm, while the Gray (80A) is nearly rigid. The increased firmness also allows the latter wheels to carry a higher RPM rating

    Collar Clamp, 1/2 Hex Bore, 2 Pc with Flats

    #am-2871
    $12.68 $14.32
    ( 0 In stock)

    This novel style of collar clamp is split into two pieces so that it can be attached without removing any shafts. The bore is a 1/2" hex. The flats on the perimeter allow for the collar clamp to be held in position or turned for better assembly control. 

    This clamp has been designed and fabricated by BaneBots, and proudly sold through AndyMark.

    Specifications:

    • Material: Aluminum
    • Bore: hex hole, 1/2 inch
    • Outside Diameter: 0.94 inch
    • Thickness: 0.375 inch
    • Width Across Flats: 7/8 inch
    • Weight: 0.020 pound
    • Clamping Screws: #6-32 x 1/2" long (qty. 2)

    Plastic spacers are included with this clamp, positioned between the two halves. These are to be removed before usage.

    0.50 in. Hex and Keyed Shaft Coupling

    #AM-1560
    $25.00
    ( 13 In stock)

    Whether you have shafts that are too short or shafts of different types, this coupling will solve every component connection issue you've had! Need to combine multiple hex shafts, multiple 1/2-inch keyed shafts, or convert between hex and keyed? This coupling solves all at a better price than anyone else can offer!

    Shaft Compatability

    This coupling has geometry to capture 0.50-inch hex shafts with an inside hex of 0.51 to 0.52 inches as well as 0.5 inch keyed shafts with a 1/8th inch keyway with a keyway width of 0.128 inches to 0.131 inches.