Caster; Twin; Swivel; 2" (50mm); Thermoplastized Rubber (Black); Stemless; Black; Rivet; 75#; Pedal Lock; Wheel (Receives Shepherd 0.35" x 1-1/8" stem) (Shepherd PSF50000BK-B / 104663)
Twin-wheel casters can be made of all plastic or solid die-cast zinc. Prices vary from the economic, all plastic models to the larger models with distinct finishes and larger sizes for best performace. On most models, the wheels are riveted on for positive retention. Like all casters, the larger sizes perform much better than the smaller ones.
Thermoplastic Rubber (TPR) wheels are precision molded and mechanically locked to a durable polyolefin core to provide an economical wheel for many applications. They provide a smooth, cushioned ride and can overcome small debris and obstacles on the floor. They offer floor protection, are non-marking and non-conductive. These often have various brand names by various manufacturers and can be flat or crowned.
TPR are considered soft wheels which may experience flat-spotting even when loaded within the acceptable weight limits. Flat-spotting is more noticeable in warmer weather. The flat-spotting will roll-out and dissipate after a few minutes of rolling, depending on the size of the standing load and extent of the flat-spotting. This is a normal occurrence of these wheels and is not a product failure. If your application cannot tolerate this temporary condition, another material type may be preferable.
