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FAQ
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FAQ

  • How do I calculate the amount of side or thrust load that a bearing can take?

    Typically a radial bearing can take 5% of its Radial Load in a Thrust Load capacity.

  • What is the purpose of the bearing retainer and what benefits accompany different retainer materials?

    The retainer (also called cage or separator) is used to separate the balls and equally position them around the bearing raceway. Some retainer materials contain lubricant for extended bearing life. Retainers for ball bearings are generally available in two designs. The most universal is a 2-piece closed ball pocket design called a ribbon retainer. A single piece open ball pocket design is called a crown retainer. Crown retainers are available in a variety of metal and nonmetal options. PACAMOR KUBAR BEARINGS offers 440C steel retainers in both crown and ribbon designs and plastic crown retainers in either Phenolic or Torlon (polyamide-imide) materials. Phenolic and Torlon retainers are excellent options for high-speed applications. Torlon offers additional bearing life under steam autoclave conditions but requires regular lubrication at maintenance intervals. Phenolic is very forgiving under lube starved and low maintenance environments.

  • What causes bearing noise?

    Bearing noise is a function of both the bearing and the way it is used. Bearing noise is not generally influenced by ABEC and there is no fixed standard among bearing manufacturers for acoustic noise. Some external factors which affect bearing noise include, lubricant type, excessive bearing load, and improper installation.

  • When should I replace my bearings?

    If you have gone through the cleaning steps outlined above and your bearings begin to feel gritty or notchy to the touch, they should be replaced. When bearings sit idle for a long time they must be protected from any and all moisture. This is a common problem when storing small RC engines. If any moisture has gotten to the bearings, they will need to be replaced before using the engine again.

  • SKF bearing tolerances, how do they equate to ABEC ratings?

    CLN/normal = ABEC1
    P6 = ABEC3
    P5 = ABEC5

  • What type of grease is used in a standard 6000 series bearing with 2RS seals?

    Bearings with outise diameters less than 62mm normally have some form of lithium soap grease with NGLI2 consistancy (MT47) and a temperature range of -30 to +110 deg C. Bearings with an outside diameter > 62mm have alithium based grease with NGLI3 consistancy (MT33) and a temperature range of about -30 to +120 deg C.

  • What Is A “Torque Tube” Bearing Or A “Thinex” Bearing?

    "Torque Tube" bearings and "Thinex" bearings are generic industry names for “Thin Section Ball Bearings”.  While not required, Torque Tube bearings often have an extended inner ring to provide a stronger and stiffer bearing (minimizing torque) than its thinness would allow otherwise.
     
    Generally, Thinex ball bearings are thinner given the same outside diameter than Torque Tube ball bearings (the term Thinex may have been derived from "thinest"); however, there is no standard definition for either in the bearing industry.

  • What is an Axial Needle Bearing or Axial Needle Roller Bearing?

    "Axial Needle Bearing" and "Axial Needle Roller Bearing" are just two variations of a type of bearing that the bearing industry typically calls "Roller Thrust Bearings" or "Cylindrical Roller Thrust Bearings." In all of these cases, the bearing is designed to support high axial loads (i.e. loads parallel to the shaft) as compared to radial ball bearings. 
     
    Generally, roller thrust bearings (a.k.a. Axial Needle Bearings or Axial Needle Roller Bearings) consist of two washers (raceways) and rolling elements which, in this case, are rollers (cylindrical rolling elements) as opposed to thrust ball bearings which use balls as their rolling elements.  While ball thrust bearings sometimes use groves in the raceways, typically roller thrust bearings use retainers (cages) to ensure proper spacing and orientation. 

  • How is bearing material hardness measured?

    There are several standard scales for measuring a material's hardness including Rockwell, Brinell, Vickers, and Shore.  For bearings, the Rockwell scale is predominantly used.  However, even within the Rockwell Hardness Test, there are several different scales used to specify the hardness of different materials.  Typically, the Rockwell "C Scale" is used for measuring the hardness of bearing materials since bearings are usually made from very hard materials.

  • Will a stainless steel bearing protect against rust?

    "Somewhat"...  Stainless steel is not rust proof, it is "corrosion resistant" and will rust in corrosive environments over time. However, stainless steel will corrode at a much slower rate than chrome alloy steel.  But it is not a simple as that.  
     
    There are various types of stainless steels each with different corrosion resistance properties.  For example a special steel called SV30 is far more corrosion resistent than 440C stainless steel.