8 inch HD Pneumatic Wheel 0.5 inch Hex Bore

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

Fastener kit for assembling AndyMark hubs to Pneumatic Wheels. 


Included Hardware: 

• Six - Individual #10-32 x 2.0" long Socket Head Cap Screw, steel, zinc plated
• Six - Individual #10-32 Nylock Nut, steel, zinc plated

Here is a six-inch version of the high-traction wheel kit you know and love which includes a grippy rubber tire, a pneumatic inner tube, and a strong plastic hub. These parts are shipped to you in kit form. The unique aspect about this product is the competition-ready hub. The hub accepts any 150x50mm tire and inner tube, 1.125 in. (outside diameter) ball bearings (2 per wheel are needed), and the mounting holes needed to install hardware to be sprocket-driven or hub-driven. This wheel ships as a separate tire, inner tube, and hub halves. Assembly is required.

Important Notes:

• Tube pinching: When assembling the tube within the two hub halves, be careful not to pinch the tube rubber between the plastic hub halves. If assembled with the tube pinched between the hub halves, the tube may puncture and leak.

RPM Rating and notes:

These wheels are designed to be propulsion wheels for driving a robot or wheel chair. The design intent is to be contacting the ground, being driven by a gearbox at a maximum speed of approximately 500 rpm (which results in approximately 13 feet/sec).

Within some applications, this wheel has been used as a shooter of objects, spinning at a very high rpm. For these applications, a higher rpm shows that the wheel may wobble, since the valve stem is mounted off to one side of the center of the wheel hub. We have seen properly balanced wheels, using securely mounted hardware (longer screws, washers) that can handle 5,000 rpm. When spinning this wheel at speeds up to 5,000 rpm, please take proper safety precautions.


Included Hardware:

• Tire for 6 Inch Pneumatic Wheel (Metric Size 150x50mm), am-2474
• Inner Tube for 6 Inch Pneumatic Wheel, with 45 Degree Stem (for 150x50mm Tire), am-2475
• Hub Assembly for 6 inch Pneumatic Wheel, which includes two (2) black plastic hub halves and six (6) 4-40 x1 Pan Head Phillips thread rolling screws

NOT Included Hardware:

• Bearings
• #10 Screws and Nuts Needed to Mount a Hub (2 Inch Long Screws are Needed) or a Sprocket (2.25 Inch Long Screws are Needed)
• Aluminum Hub, if driven by a shaft

Wheel Structure:

The hub halves are held together with the #4-40 screws. This wheel can accept #10-32 screws for mounting sprockets or hubs, but these are NOT included since different length screws are needed to mount hubs or sprockets. These #10 screws can be mounted to the included 1.875 inch diameter bolt circle. The hub halves need to be assembled together so that the valve stem clearance holes line up. Locating features are present for easy alignment.

Assembly: 

This is a helpful step by step guide on how to assemble the wheel, it can be a bit tricky. 

Usage:

With Axle and Hub:

• In order to drive this wheel with a hub, use six (6) #10-32x2.25 screws (am-1156) and six (6) #10-32 nylock nuts (am-1042).

With Sprocket:

• In order to drive this wheel with a plate sprocket, use six (6) #10-32x2.25 screws (am-1156) and six (6) #10-32 nylock nuts (am-1042).
• Two (2) bearings are needed for this wheel when being driven by a sprocket. Use bearings with a 1.125 inch outer diameter. No flange is needed on either of the bearings.

Use as a caster:

• If you want to let this wheel spin without being driven, you will need to install two (2) bearings with 1.125 inch outer diameter.

Specifications

• Bolt Pattern: 6 holes, 0.20 diameter on 1.875 in. diameter bolt circle
• Bore: 0.960 in. thru hole, with 1.125 in. x 0.375 in. deep bearing pockets
• Diameter: 6.00 in.
• Load Capacity: 120 lbs
• Material: black polycarbonate, gray rubber
• Maximum Pressure: 35 psi
• Tread Width: 1.39 in.
• Valve Stem: The valve stem may stick out up to 0.25 in. from the hub
• Weight: 0.71
• Width Across Middle: 2.190 in.

Documents

Layout Print(s)

am-4189 6in pneumatic wheel.PDF

CAD File(s)

am-4189 6in pneumatic wheel.STEP