5" x 2" Cast Iron V-Groove Wheel Kingpinless Swivel Caster with Face Contact Brake - 900 Lbs Capacity Up_To_600°F 4" x 2" Ductile Steel

4" x 2" Ductile Steel Wheel Swivel Brake Caster - Part # 146DUCT420SB

300˚F Wheel Color:Silver Weight: 19

but is more economical

Hub Length (with Bearings): 2-7/16" (2-5/16" if short bearings)

Wheel Color:Black

5" x 2" Cast Iron V-Groove Wheel Kingpinless Swivel Caster with Face Contact Brake - 900 Lbs Capacity Up_To_600°F 4" x 2" Ductile Steel5" x 2" Cast Iron V Groove Wheel Kingpinless Swivel Caster with Face Contact Brake Part # P51052VIRBFCB V Groove wheels are designed to guide equipment by rolling on inverted angle iron track, however, they can also operate while not on a track thanks to the tread on either side of the v groove. The cast iron wheel offers a strong, resilient, cost effective solution for heavy loads. If more capacity is needed, check out the heavier duty ductile steel