Caster City, Inc. 4" x 2" V Groove Ductile Steel Wheel - 3/4" Roller Bearing VS4x2

4" Diameter V-groove caster wheels are designed to guide equipment by rolling on inverted angle iron track. Elevated track minimizes problems caused by floor debris. The relief groove at the base of the "V" equalizes the load on each face of the angle. Forged Steel V-groove caster wheels minimize wear of the V-groove sides and are best for frequent operation. When not operating on track, the considerable wheel tread on each side of the V-groove allows for use on smooth floors. It is important that if more than one track is used they are parallel, straight and level. Otherwise V-groove wheels may bind or run up over the track. Tolerance should be within plus or minus 1/64" every 20 feet. Joints between pieces of track should be smooth and well reinforced. V-groove caster wheels are standard with straight roller bearings, which allow only 1/16" total end play (side to side movement). It is desirable when loads are great to use tapered bearings, which have thrust as well as radial capacity. The proper adjustment of tapered bearings prohibits end play. Compression must be applied to properly seat tapered bearings. This is achieved by tightening down against a bearing spacer on each side of the wheel to a maximum looseness of .010. Since tapered bearings prohibit end play, their use requires parallel track. Unless the layout is nearly perfect, it is best to use a single angle iron track for V-groove caster wheels parallel to an elevated flat bed for wheels without a V-groove.