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    25 Series Symmetrical Hub Sprockets 500Hex, 18 Tooth

    9 different offerings of our 25 Series Hub Sprockets. These are perfect for meshing with roller chain and finally getting that-thing-that-you-need-to-spin moving!


    These aluminum sprockets work perfectly with 1/2 in. hex shaft and mesh with #25 roller chain. They are symmetrical and have the same sized hub on both sides so there's no wrong way to install them. The hub is also sized to ride on only the inner race of a bearing for smooth motion without binding or rubbing.

    Note: Despite the prints, at this time, tooth alignment to the bore is not controlled on these sprockets.


    Part Number Tooth Count Bore Pitch Diameter (in.) Outside Diameter (in.)
    am-4772 10 8mm key 0.810 0.928
    am-4773 14 1/2 in. Hex 1.123 1.251
    am-4774 14 3/8 in. Hex 1.123 1.251
    am-4775 18 1/2 in. Hex 1.440 1.572
    am-4776 18 3/8 in. Hex 1.440 1.572
    am-4777 22 1/2 in. Hex 1.757 1.893
    am-4778 22 3/8 in. Hex 1.757 1.893
    am-4779 26 1/2 in. Hex 2.074 2.212
    am-4780 26 3/8 in. Hex 2.074 2.212




    • Chain Series: 25
    • Material: 7075 Aluminum
    • Thickness: 0.500 in.
    MFR Part #: am-4775
    Availability: 9 in stock
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    Andymark Hubs 1/2 in. Hex

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    Each hub now has a "flower" pattern that fits and keys into our 42T 5 mm HTD Pulley, which means you are no longer constrained to our legacy 500EX Hex Hub for compatibility with this pulley. Every hub still maintains a closed-profile hole for maximum strength. Every shaft hub has been designed with bearing bosses on both sides that have been sized appropriately for the mating bearings that would pair with the bore through the hub, which means you can run each hub right against a bearing with no need for extra spacers. All of these hubs are also made from 7075-T6 aluminum, which is much stronger than the previously used 6061-T6, 6005, and 6105 alloys from our older designs. Where possible, the shoulder on shaft hubs was reduced to 7/8" in diameter for an easier fit with our molded plastic wheels, while still maintaining a precise 1.125" diameter boss for locating in wheels, sprockets, gears, and more. 


    The holes are evenly spaced on a 1.875 in. circle and 0.201 inches in diameter. That's a perfect size for #10 bolts!


    Learn how to attach these hubs to AndyMark wheels by watching this video!

    #25 Connecting Link for Roller Chain

    (In stock)

    #25 Connecting Link (Master Link) 


    • Material: Steel
    • Style: Roller Chain - Spring Clip
    • Type: Connecting Link
    • Size: #25
    • Pitch: 0.250 inch
    • Weight: 0.01 lbs

    25 Series Symmetrical Hub Sprockets 500Hex, 14 Tooth

    (16 In stock)

    The 25 Series Plate Sprockets: They roll! They turn! They spin! Everything you could possibly want from a plate sprocket.


    These Aluminum sprockets work perfectly with hex shaft and mesh with #25 roller chain.