The bearings listed in the sample reflect the latest bearing design technology and the level of quality assurance. If the products in this sample fail to meet your needs, please contact with ZFB Technical Department directly. We will develop and design specially according to your requirements.

Material

The performance and reliability of rolling bearings are deeply influenced by the materials used for bearing components. The bearing rings and rolling elements of ZFB bearings are made of high-quality GCr15 vacuum degassing steel. The chemical composition of bearing steel GCr15 is basically equivalent to the data listed in Table one.  The majority of ball bearing retainers are stamped by the cold rolled steel sheet, while they are molded by glass fiber reinforced polyamide 6.6 or machined by brass for some types of bearings and special applications

Lubrication

Grease is the semi-solid lubricant composed of three parts including thickening agent, liquid lubricant, and additive, wherein the liquid lubricant (also referred to as base oil) covers the largest proportion of 80% to 90% in general, thickening agent of 10% to 20%, and additive of about 5%. Although these three ingredients have different proportion in the grease, they play an important role in the performance of grease.

Radial clearance

The inner side of bearing is designed with clearance in order to keep the normal operation of the bearing. The radial clearance of deep groove ball bearing is defined as the amount of axial movement of inner ring from one limit position to the other limit position when the outer ring is stationary. The amount of clearance has great influence in the load distribution, friction, vibration, noise and running precision of the bearing. On the other hand, the clearance of the bearing changes with the different type, speed and temperature rise. The radial clearance is divided into different groups so as to meet the requirements of a variety of applications. The clearance groups of deep groove ball bearing are shown in Table two.

Table one  The chemical composition of bearing steel

Table two  Radial clearance

The comparison of cage types

The standard cages of small and medium-size bearings are pressed steel cages. It almost can meet the requirements in all application conditions. However, the glass fiber reinforced polyamide 6.6 or solid brass cage is also used in some cases.  

Assembly chamfering limit

Dimension tolerance and running accuracy code

d      Nominal bore diameter      

B           Nominal width of Inner ring 

Δds      Single inner diameter deviation                        

ΔBs       Single width deviation of inner ring

Δdmp    Single plane mean bore deviation

VBS       Amount of change of inner ring width

Δd1mp  Basic tapered bore at the theoretical big end

C       Nominal width of outer ring mean bore deviation                       

ΔCs       Single width deviation of outer ring         

Vdp       Amount of change of single radial plane
Vcs        Amount of change of outer ring width                    

Vdmp    Amount of change of mean bore            
Kia       Inner ring radial run-out of bearing assembly           

D       Nominal outer diameter                  

Kea       Outer ring radial run-out of bearing assembly           

ΔDs       Single outer diameter deviation              

Sd       The run-out of inner ring end to bore         

ΔDmp    Single plane mean outer diameter deviation      

SD       The run-out of outer ring to bore       

VDP       Amount of change of single axial plane outer diameter  

Sia       The run-out of inner ring of bearing assembly to raceway

VDmp    Amount of change of mean outer diameter          

Sea        The run-out of outer ring of bearing assembly to raceway

                0 class tolerance inner ring                      μm

1)Including 0.6

                0 class tolerance outer ring                                     μm

1) Including 2.5

2) Equal to the ΔBs value marked on the inner ring of the same bearing

                   6 class tolerance inner ring                            μm

1)Including 0.6

                  6 class tolerance outer ring                            μm

1)Including 2.5

2) Equal to the ΔBs value marked on the inner ring of the same bearing

           5 class tolerance Inner ring                            μm

 1)Including 0.6

                    5 class tolerance outer ring                                                         μm

1)Including 2.5

2) Equal to the ΔBs value marked on the inner ring of the same bearing

  4 class tolerance inner ring                                                                                                μm

Including 0.6

      4 class tolerance outer ring                                                                             μm
 1)Including 2.5

2) Equal to the ΔBs value or VBS value marked on the inner ring of the same bearing

Recommend fit of bearing and shaft

Note: (1) Cr indicates the basic rated load of the bearing

 (2) As for the numerical value related to IT, please refer to the related standards.

Remark: The table is suitable for steel solid shaft.

The recommended fit between bearing and housing hole

Note: 1. The table is suitable for

Basic code

The basic code is the dimension series code composed of dimension series code and the subsequent inner diameter code

Inner diameter code

d (mm)<10   The code directly indicates the diameter dimension. Sometimes, it use slash "/" and other code

=1 0Inner diameter code 00

=1 2        Inner diameter code 01

=1 5        Inner diameter code 02

=1 7Inner diameter code 03

17~500  Inner diameter multiplied by 5 is equal to the bearing diameter

≥500  The coder directly indicates the inner diameter and separated with a slash "/"

The front code and postposition code of deep groove ball bearings

Front code

SStainless steel bearings

FMetric bearings with flanged outer ring (d ≤ 10mm)

MF   Non-standard metric with flanged outer ring

RInch (d ≤ 10mm)

MRNon-standard metric (d ≤ 10mm)

Postposition code

A  Internal improved design, it is standard design without mark.

 K  Tapered bore bearings, taper 1:12

 -RS  Bearing with frame-type rubber seals on one side (Contact type)

-2RS Bearing with frame-type rubber seals on both sides (Contact type)

-RZ    Bearing with frame-type rubber seals on one side (Non-contact type)

-2RZ  Bearing with frame-type rubber seals on both sides (Non-contact type)

-Z       Bearing with a shield on one side

-2Z     Bearing with shields on both sides

R       Bearing with snap rib (flanged outer ring) (d>10)

-ZN   Bearing with a shield on one side, the outer ring has snap groove on the other side

-ZNR  Bearing with a shield on one side, the outer ring has snap groove with snap ring on the other side

N   Bearing outer ring with snap groove

NR   Bearing outer ring has snap groove with snap ring 

T   Phenolic cloth laminated tube solid cage

TA      Phenolic cloth laminated tube solid cage, guided by outer ring 

TB      Phenolic cloth laminated tube solid cage, guided by inner ring 

TN     Engineering plastic molding cage, to present different materials with additional number

Y        Copper plate pressed cage, differs with additional number when material changes

J        Steel plate pressed cage

M  Brass solid cage, guided by steel ball 

MA  Brass solid cage, guided by outer ring 

Brass solid cage, inner ring guide

/S0  The working temperature of bearing ring will achieve 150℃ through high temperature tempering treatment

/S1  The working temperature of bearing ring will achieve 200 ℃ through high temperature tempering treatment

/S2  The working temperature of bearing ring will achieve 250 ℃ through high temperature tempering treatment

/S3  The working temperature of bearing ring will achieve 300 ℃ through high temperature tempering treatment

/S4  The working temperature of bearing ring will achieve 350 ℃ through high temperature tempering treatment

/P0   Tolerance class compliant with stand 0 class

/P6   Tolerance class compliant with stand 6 class

/P5   Tolerance class compliant with stand 5 class

/P4   Tolerance class compliant with stand 4 class

/P2   Tolerance class compliant with stand 0 class

/CN     0 group clearance, /CN combined with letter H, M or L, representing the clearance range is halved

CNH   0 group clearance is halved, in the upper half

/CNM  0 group clearance is halved, in the mediate half

/CNM  0 group clearance is halved, in the lower half

/C2    Clearance compliant with 2 class

/C3    Clearance compliant with 3 class

/C4    Clearance compliant with 4 class

/C5    Clearance compliant with 5 class

/C9    Clearance compliant with 9 class

/P53  Represent bearing tolerance P5 class, radial clearance 3 group

/P62  Represent bearing tolerance P6, radial clearance 2 group

/P63  Represent bearing tolerance P6, radial clearance 3 group

/HT    Bearing filled with high temperature grease

/LT     Bearing filled with low temperature grease

/MT    Bearing filled with special medium temperature grease

/LHT  Bearing with special high, low temperature grease

/VB    Special assembly chamfer