5" x 1-1/4" Thermoplastic Rubber Wheel (ball bearings) Swivel Caster w/ 1/2" x 1" long Threaded Stem - Part #: Q505021MIR
Thermoplastic Rubber Wheels combine the advantages of both a hard & soft tread material in a single wheel, making it one of our favorite caster wheels. Like a hard tread wheel, thermoplastic rubber rolls easily and is very durable. Like a soft tread wheel, it is quiet, protects floors, and has a cushioned ride. These caster wheels also hold up well when exposed to weather, are resistant to chemicals, water, & steam, and reject floor debris. We highly recommend these caster for applications requiring non-marking, floor protective, quiet, and smooth rolling wheels. We would not recommend these wheels for applications that require sitting in one spot for long periods of time under heavy loads.
Specifications: 
| Load Capacity (lbs.): 350 | Link to Replacement Wheel: QMIR5G3 | 
| Wheel Diameter: 5" | Caster Rig Color/Finish: Silver Zinc Plated | 
| Tread Width: 1-1/4" | Swivel or Rigid Caster: Swivel | 
| Wheel Type: Thermoplastic Rubber | Swivel Radius: 4" | 
| Wheel Bearing Type: Ball | Swivel Construction/Diameter: Kingpin | 
| Overall Height: 6-1/8" | Temp Range: -45 to 180˚F | 
| Stem Size: 1/2" | Wheel Durometer: Shore 65 A (+/-5) | 
| Stem Length: 1" | Wheel Color: Grey | 
| Stem Thread Pitch: 13 | Weight: 1.67 lbs |