Spherical metal casters casters casters casters screw construction 
 By a single wheel mounted on the bracket is made for the installation of the equipment below to make it move freely. Casters can be divided into two categories: 
 A fixed castors 
 Fixation coupled with a single round, can only move along a straight line. 

 B Caster 
 360-degree turn of the stent coupled single-round, is able to travel in any direction. 

 Installation height 
 Refers to the installation location from the ground to the vertical distance between the castor mounting height is the floor with the caster wheel remote with the largest vertical distance. 

 Center distance steering bracket 
 Refers to the center vertical line to the wheel core rivet the center of horizontal distance. 

 Turning radius 
 Refers to the vertical center line of rivets to the outer edge of the horizontal distance from the tire, proper spacing so that wheels can turn 360 degrees. Turning radius is reasonable or not directly affect the caster's life. 

 Traffic load 
 Casters in the moving load-bearing capacity. Also known as dynamic load. Casters and the dynamic load due to the implementation of standards and test plant in different ways and different. Also due to different materials and different wheels. Lies in the structure and quality of the stent is able to shock and vibration. 

 Impact load 
 When the device by the host material impact or shock load-bearing capacity of the moment when the caster. 

 Spherical metal casters casters casters static load screw 
 Casters in the stationary state can withstand the weight. Static load in general should exercise load (dynamic load) of 5 to 6 times the static load should be at least 2 times the impact load. 

 Turn 
 Hard, narrow wheels than the soft, wide wheels easier to turn. Turning radius is an important parameter of the wheel turning, turning turning radius is too short will increase the difficulty of shaking the wheel is too large and will result in shortened life expectancy. 

 Travel flexibility 
 Affect the flexibility of the factors driving wheels: steel frame structure and frame selection, wheel size, wheel type, bearing and so on. Greater flexibility to better driving wheel, on the ground in a smooth, hard, flat side than the narrow round soft wheel effort. However, uneven ground, soft wheels and effort. However, uneven ground, soft wheels to better protect the equipment and shock. 
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