Caster; Swivel; 6 x 1-1/4; Flat Free (Gray); Threaded Stem; 1/2-13TPI x 1-1/2; Zinc; Ball Brng; 150# (Shepherd PGS60748ZN-NOM21(GG))
Wheel Diameter: 6"Tread Width: 1-1/4"Material: Foam-Filled Flat Free Tire (Gray)Load Rating (Per Item): 150 poundsFinish: ZincConnector Details: Threaded Stem (1/2"-13TPI x 1-1/2")Bearing: Ball BrngLoad Height: 7-1/8"Swivel Radius: 4-1/2"Shipping Weight: 2.85 lbs.Usually Ships in: 24 hours (may be affected by quantity ordered)
Flat Free (also known as semi-pneumatic) are extremely popular wheels. Made to perform like a pneumatic tire, they are filled with a lightweight, microcellular polyurethane foam. They retain the lightweight, bounce and cushion like a pneumatic tire, without the nuisance of air leaks.
Flat free wheels will typically experience temporary flat-spotting even when loaded within the acceptable weight limits. They tend to flat spot immediately, a little more after a few hours, a little more at 24 hours, and not much more after that regardless of time. 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.