What does CN mean on a bearing?

CN is the “normal clearance” and is defined by DIN 620 and ISO 5753 and is used for bearings in normal operating conditions; C1 and C2 class bearing have radial clearances smaller than CN.

What do the letters at the end of a bearing number mean?

The following two digits identify the ISO dimension series. The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D). The last two digits of the basic designation identify the size code of the bearing bore.

What is C clearance?

C codes for degree of bearing clearance

If a bearing has a C code, it offers extra internal clearance. C1 offers the least extra clearance, C5 offers the most extra clearance. The extra margin C3 offer is considered 'normal'. Bearings with C3 are in fact the most commonly used.

What does C3 mean for bearings?

Internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the two rings.

What is the difference between a C3 and C4 bearing?

C3 – Refers to a “greater than standard clearance”. This is the most common type of bearing, and is the correct choice for the majority of applications. C4 – Refers to “greater than C3 clearance”. Not as common as C3, but often specified in small engine crankshaft bearings.

What do bearing designation numbers mean?

What does RS1 mean on a bearing?

RS1 = Seal on one side. RSH = Seal on one side. RS = Seal on one side. LU = Seal on one side.

What is CN bearing clearance?

CN is the “normal clearance” and is defined by DIN 620 and ISO 5753 and is used for bearings in normal operating conditions; C1 and C2 class bearing have radial clearances smaller than CN.

Is C3 a high speed bearing?

It is also suitable for high speed applications. This bearing has a C3 radial internal clearance designation to indicate that the radial slack between the inner and outer rings is greater than the standard CN (normal) clearance.

What is the difference between 2Z and C3 bearings?

The 2Z suffix indicates that the bearing has a steel seal on both sides. The bearings are filled with a high-quality grease and are lubricated for life. The C3 in the product name means that this bearing has a higher (internal) clearance than normal. The C3 clearance is most frequently used for this type of bearings.

Should wheel bearings be C3?

Unless the bearing you are replacing specifically says C3 on it then you should not replace it with a C3 bearing, C3 Bearings are loose to the feel from new and often people complain at the quality of the bearing being poor and having more movement than the one they are replacing.

What should be bearing clearance?

The Rule of Thumb

Generally speaking, bearing clearance should be 0.001-inch for every inch of journal diameter.

How do you check radial clearance of a bearing?

This is the total clearance inside a bearing in the radial direction. Its numerical value can be calculated by subtracting from the diameter of the outer race roller path or ball groove I.D. two times the rolling element diameter and the O.D. size of the inner race roller path or ball groove.

What is ZZ bearing?

ZZ is the code used for sealed bearings, which belongs to the post code in the bearing code. The seal of the bearing indicated by ZZ is a double-sided seal with a dust cover. The material of the seal cover is a steel plate.

How do you read a bearing?

Note: The bearing of a point is the number of degrees in the angle measured in a clockwise direction from the north line to the line joining the centre of the compass with the point. A bearing is used to represent the direction of one point relative to another point. For example, the bearing of A from B is 065º.

What are bearing numbers?

A bearing number is composed of a basic number and a supplementary code, denoting bearing specifications including bearing type, boundary dimensions, running accuracy, and internal clearance.

What is W33 in bearing?

Spherical roller bearings 22222CCK/W33

For example , 22222 CCK/W33 bearing, the suffix CC means stamping steel cage , K means tapers , W33 means the bearing outer ring has oil groove along with 3 oil holes.

How do you choose motor bearing grease?

Choose a grease with a high ASTM D3336 oxidation life or DIN 51821 FE 9 high temperature bearing life testing. Anti-wear: Unless a motor is mounted so there is a thrust load on the bearings, it is advisable to choose a grease that does not have extreme pressure additives.

What is the difference between C3 and CM bearings?

The CM clearance falls within the range of the CN clearance. CM clearance is specified by some motor manufacturers where closer radial internal clearance helps reduce noise. C3 clearance, which is frequently used in the aftermarket, is greater than the CN and CM clearances.

How much clearance do you need between bearing and shaft?

For instance, internal radial clearance of a deep-groove ball bearing mounted on a solid steel shaft with an interference fit of 0.013 mm (0.0005 in.) may be reduced as much as 0.010 mm (0.0004 in.)

How much play should a ball bearing have?

Ideally, there should be zero residual radial play in the bearing to minimize ball skidding and reduce axial play (end play) so correct selection of the initial radial play is important. A number of things can alter the radial play during the fitting process.

What does LLB mean on a bearing?

LLB = light contact, dual lip, nitrile rubber, steel insert. LLU = full contact, dual lip, nitrile rubber, steel insert.

What does VRS mean on a bearing?

November 2013. Its a non contact low friction seal used for very high speed applications. Pointless fitting it to a suspension link just fit the right number RS bearing. mxh Posts: 51.

What company makes the best ball bearings?