4" Plastic Omni Wheel Specifications: Diameter: 4 inches Width Across Middle: 0.62 inches Bore: 1.125 inch diameter Bolt Pattern: 6 holes on a 1.875 inch bolt circle Body Material: Black polycarbonate Load Capacity: 50 pounds (rollers don't spin past this point) Coefficient of Friction, Forward/Backwards: Static: 1.0, Dynamic: 0.8-0.88 Coefficient of Friction, Sideways: Static: 0.2-0,27, Dynamic: 0.16-0.2 Weight: 0.45 pounds Number of Rollers: 9 Roller Material, Outside: Black SBR Rubber Roller Durometer: 80A Roller Bearing Material: Brass Roller Axle: Steel dowel pin Roller Diameter: 3/4 inch Repairable by removing interior M5 screws Included Hardware: Two - 4" Plastic Omni Wheel Webs Nine - Black SBR Rollers Nine - 1x1/8 Steel Dowel Pins Eighteen - Omni-roller Sleeves Six - Individual #10-32 x 1/2" SHCS Six - Individual M5 Nylock Nuts Usage: With Hub: If you wish to drive this wheel with an Axle and Hub, you can pick your hub by fitting any of the AndyMark hubs (except the Small DD Globe Hub) to this wheel. Hubs are NOT included in the price of the wheel. If this is your choice, then no bearing is needed. With Sprocket: If you wish to drive this wheel with a sprocket, then the sprocket needs to be attached to the side of the wheel, and two ball bearings need to be pressed into the wheel (one on each side). The ball bearing must have a 1.125" od. With Bearings: Wheels can be driven by 1 hub or they can ride on up to two bearings. The center bore is sized to receive a 1.125" outside diameter flange bearing (FR8ZZ or am-0573) on either side in a press fit manner. These need to be purchased separately.
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