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Terms & Installation

Caster Helpful Terms

In order to correctly select a caster, one must first become acquainted with the terminology used when referring to casters. Below is a table defining various caster terms that may assist you when choosing the correct caster for your needs. It may also be helpful to consult the other reference materials Monroe has provided in the casters section of our site. If there are any further questions or concerns, feel free to direct them towards one of Monroe's helpful sales representatives.
Bolt Hole Spacing: The distance between top plate bolt holes. Mounting (Top) Plate: The plate at the top of the caster which is bolted or welded to the equipment. Raceway: Surface on which ball bearings roll. Swivel Radius: Horizontal distance between the centerline of the swivel kingpin and the outside edge of the wheel.
Capacity: Maximum load per caster based on expected operation (expected maximum load divided by number of casters) Fork Assembly (Rig or Yoke): The caster assembly without wheel and axle. Rollability: Force required to begin or maintain motion. Thrust Washer: The washer between the wheel hub and the inside of the caster leg.
Caster Size: Same as wheel diameter. Load Height: Vertical distance from top surface of top plate to the bottom of the wheel. Spanner Bushing: The fixed sleeve in which the
axle runs.
TPR: Thermoplastic Rubber
Dynamic or Rolling Load: Load on a caster or wheel while in motion. Offset: Horizontal distance between the centerline of the swivel kingpin and the centerline of the axle. Shorter offsets are stronger while longer offsets improve maneuverability. Static Load: Load on a caster or wheel while at rest. Tread Width (Face): Width of the wheel tread.

Caster Installation Tips

Shown below are several typical caster mounting arrangements often used on carts, trucks and other mobile equipment. Each arrangement offers its own advantages and performance qualities.
Two Swivel, Two Rigid Pattern
Four Swivel Pattern
Four Rigid Tilt Mounting
Two Swivel, Two Rigid Diamond Pattern
Four Swivel, Two Rigid Pattern
Three Swivel Pattern

A common design which allows for swiveling ease yet allows cart to track in a straight line for long distance

A versatile arrangement which allows for maximum maneuverability and the ability to move the cart sideways. Not recommended for long straight line tracking

Center wheels 1/8” taller than front/rear wheels. Economical, but not recommended for ramps or heavy duty loads

A very maneuverable design that allows cart to turn in its own length

Recommended for heavy loads and long carts or equipment. The two rigid casters help support the load and reduce the weights on the swivel casters. This allows for greater swiveling ease and maneuverability

Recommended for barrel dollies and small equipment. Excellent swiveling
and maneuvering ease in all directions