Xez super precision bearing

WUXI No.2 BEARING CO.,LTD
Add: No.1 LIJIANG ROAD, NEW DISTRICT,WUXI,214028 CHINA
Tel: +86(510)68937980
M/T: +86-15961897823
Fax: +86(510)85217940
Site: www.xezchina.com

XEZ bearing with ultra-precision, ultra-high speed performance,widely used in machine tool spindle,
electric spindle, ball screw, and other precision machines.
Features:
High precision, high speed,low temperature rise,low noise, long life.
Recommended type:
70 series(H70),72 series high-speed angular contact bearing
Such as:
7002C 2RZ P4 HQ1 XEZ, 7205C 2RZ P4 HQ1 XEZ
Features:
High precision, high speed,low temperature rise,low noise, long life.
Recommended type:
70 series,72 series high-speed angular contact bearing
Such as:
H7005C 2RZ P4 HQ1 XEZ.
Features:
High precision,low temperature rise,long life.
Recommended type:
70 series,72 series,719 series high-speed angular contact bearing,
NN30 series cylindrical roller bearing.
Such as:
7012C TYNSUL P4 XEZ,7014A5 TYN SUL P4 XEZ.
Features:
Carrying heavy Axial loads,high accuracy.
Recommended type:
BS series,760 series,TAC series ball screw bearings
Such as:30TAC62B SUC 10PN7B XEZ, BSB040090 TN1
P4 GB.
Features:
Simultaneously acting radial and axial loads,medium load
carrying capacity.
Recommended type:
72 series angular contact ball bearing with AC or B angle.
Such as:
7201AC DF P5 XEZ,7204AC DF P5 XEZ
Features:
High load carrying capacity，medium speed,long life.
Recommended type:
72 series,73 series angular contact ball bearing with AC or B
angle.
Such as:
7213B DFB P5 XEZ,7314BECBM P5 XEZ.
Features:
High speed,high precision,High Temperature
Resistance,High Durability.
Recommended type:
70,72,73 series,60 series,BN17,BN25 bearings of chemical
fiber textile machinery.
Such as:
7205CTPA/P4,BN25-10TVV/P43

Standard type:
718 series, 719 series, 70 series, 72 series
Features:
ƇContact Angle: 15°, 25°;
ƇCage Material: Phenolic(T), Polyamide(TN);
ƇBall Material: Steels or Silicon Nitride Ceramic;
ƇExternal design:Open,Sealed;
ƇAccuracy: P5,P4,P2;
ƇMatched bearings:SU&GA,DT&DB and any matching
Features:
ƇContact Angle: mainly provide high speed bearing
with C angle(15°),
ƇCage Material: Phenolic(T), Polyamide(TN)
ƇBall Material: Steels or Silicon Nitride Ceramic
ƇExternal design:Open,Sealed
ƇAccuracy: P5,P4,P2
ƇMatched bearings:SU&GA, DT&DB and any
matching.
High-speed type:
H719 series,H70 Series
Improved Type:B70 series
Features:
ƇContact Angle: mainly provide improved high-speed bearing
with C angle(15°).
ƇCage Material: Phenolic(T).
ƇBall Material: Steels or Silicon Nitride Ceramic.
ƇExternal design: mainly Open
ƇAccuracy: P4,P2
ƇMatched bearings:SU&GA DT&DB and any matching.
BAR& BTR series
Features:
ƇHigh-speed Angular Contact Thrust Ball Bearing ;
Contact Angle:BAR series is 30°,BTR series is 40°
ƇCage Material:Polyamide(TN)
ƇExternal design:Opened
ƇAccuracy: P4
ƇMatched bearings: provide SUL,DBL,DBBL.
Features:
ƇStandard Angular Contact Thrust Ball Bearing ;
ƇContact Angle:40°
ƇCage Material:Polyamide(TN),Brass(M)
ƇExternal design:mainly Opened,Sealed is
available;
ƇAccuracy: P5,P4
ƇMatched bearings: provide GB,DB,DT,DF.
7200 B series, 7300 B series
Features:
ƇLoads: mainly acting radial loads;
ƇRolling element: short Cylinder;
ƇBores: Cylindrical,Tapered(K);
ƇLubrication hole in the outer ring can be
provided(W33);
ƇCage Material:Mainly Brass(M),also provide
Polyamide(TN);
ƇAccuracy: P5,SP,P4;
Ball Screw Support Bearing series
3.1 760 series; 3.2 BSB&TAC series
Features:
ƇUsed in standard ball screw bearings;
ƇContact angle:60°;
ƇExternal design:mainly Opened,Sealed
is available;
ƇCage Material:Polyamide(TN);
ƇAccuracy: P5, P4;
ƇMatched bearings: provide GB universal
and any matching;
NN30**K/W33 series

Designation System
Precision angular contact ball bearing-718 series(Standard)
a=15º，25º
Structure
Bearing Type
Designation of size series
Inner Diameter
Contact Angle
Cage Material code
Preload
Matching
Precision
Rolling element Material
Seals
ID：10-150mm
Type
Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)
Sealed
Grease Oil Grease Oil
Structure
Bearing Type
Size series
Inner diameter
Contact angle
Cage Material
Seals
Rolling element
Precision
Matching
Preload
Remarks
-:Standard high-speed; B:Improved high-speed; H:ultra-high speed
7: Single row angular contact ball bearing
18:18 series;19: 19 series; 0:10 series; 2:02 series
ID:under 03: 00:10mm; 01:12mm; 02:15mm; 03:17mm;
ID equal to or more than 04=ID code x 5(mm)
C:15°;AC:25°
T: Polymer cage, guided by the outer ring;
TN:Polyamide cage, guided by the rolling elements
- : Open;2RZ: non-contact rubber seals
- :Steel(GCr15); HQ1:Silicon Nitride Ceramic(Si3N4); SQ: Stainless Steel(9Cr18)
P2: ISO2 class; P4:ISO class; P5:ISO5;P4Y:Size Accuracy ISO4, rotating accuracy ISO2
G:Universal; DU:Two universal bearings as a set;DB: back-to-back;DF: face-to-face;
A:Light preload;B:Medium preload;C:Heavy preload;
CA:Light clearance;CB:Medium clearance; CC:Heavy clearance

a=15º,25º
a=15º,25º
18
Type
Sealed
ID:10-150mm
Type
Sealed
18
Type
Sealed
ID:6-150mm
Type
Sealed
Grease Oil OilGrease
Grease Oil Grease Oil Grease Oil Grease Oil

a=15º,25º
Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)
Sealed Type
Sealed
ID:10-150mm
Type
Diemensions（mm） Load Rating(KN) Limited Speed(r/min)Ceramic ball(r/min)
Sealed

Precision angular contact ball bearing-H719 series(Ultra-high Speed)
a=15º,25º
Precision angular contact ball bearing-H70 series(Ultra-high Speed)
a=15º,25º
Type
Dimensions(mm) Load Rating(KN) Limited Speed(r/min)Ceramic ball(r/min) Sealed
Type
Sealed
18
18
ID:10-130mm
Type
Sealed
ID:6-130mm

Precision angular contact ball bearing-B70 series(Improved：used in fog lubrication)
a=15º
Type
Sealed
28000
Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min) Ceramic ball(r/min)
Sealed
ID:10-60mm
Type
Dimensions(mm) Load Rating(KN) Limited Speed(r/min)
Sealed
Grease Oil

Designation system
Angular Contact Thrust Ball Bearing- BAR BTR Series
BAR Angle: 30º, BTR Angle: 40º
Bore diameter
Bearing Type
Materials Symbol
Preload
Matching
Precision
Cage Material
Bore diameter Bore diameter(mm)
Bearing Type BAR:angle 30º; BTR:angle 40º
Size series 10:10 Series except width diameter
Materials
Symbol
Symbol
Materials
Material of inner and outer rings Material of Rolling elements
Cage Material M: Brass;TYN:Polyamide 46；TN:Polyamide 66, guided by the rolling elements
Precision P2A: P2 tolerance except OD; P4A: P4 tolerance except OD;
Matching G:Universal;DU:Two universal bearings;DB:Back-to-back;DF:Face-to-face; DT:Tandem
Pre-load EL:Slight preload;L:Light preload;
CP: Special clearance of pre-load;CA: Special axial clearance;
Remark
ID:50-150mm
Type
Dimensions(mm) Load Rating(KN)
Coa Ca
Max axial
Loading
(KN)
Acting
Position
a(mm)
Weight
(Kg)
Limited Speed(r/min)
Grease Oil

Angular Contact Thrust Ball Bearing- 7200B 7300B Series
a=40º
105
Type
Dimensions(mm) Load Rating（KN）
Coa Ca
Max axial
Loading
(KN)
Acting
Position
a(mm)
Weight
（Kg）
Limited Speed(r/min)
Grease Oil
Bearing Type
Bore diameter
Contact Angle
Seals
Pre-load
Matching
Precision
Cage
01:12mm;
Bearing Type
Size Series
Bore
diameter
Contact Angle
Seals
Cage
Precision
Matching
Pre-load
Remark
7:Single row angular contact ball bearing
18:18 series; 19:19 series; 0:01 series ;2:02 series; 3:03 series
ID:under 03: 00:10mm; 01:12mm; 02:15mm; 03:17mm;
ID equal to or more than 04=ID code x 5(mm)
B:40º
-: Open ; 2RZ: non-contact rubber seals; 2RS: Contact rubber seals
TN: Polyamide cage, guided by the rolling elements ; M: Brass cage
P2:ISO2; P4:ISO4; P5: ISO5
G:Universal; DU:Two universal bearings as a set;DB: Back-to-back;DF: Face-to-face;
CA:Light clearance;CB:Medium clearance; CC:Heavy clearance
ID: 10-150mm
Type
Grease Oil

Designation System
52
Type
Grease Oil
Bearing type
Bore Diameter
Seals
Pre-load
Matching
Precision
Cage
Bearing Type
Size series
Bore diameter
Seals
Cage
Precision
Matching
Pre-load
76: Angular Contact Thrust Ball Bearing with 60°contact angle
02:Size series 02; 03:Size series 03
025: ID ĳ25mm
-: Open ; 2RZ: non-contact rubber seals; 2RS: Contact rubber seals
TN:Rolling element riding Polyamide cage
G:Universal; DU:Two universal bearings;DB:Back-to-back;DF: Face-to-face;
Remarks

Ball Screw Support Bearing 760 Series
a=60°
Designation System
Ball Screw Support Bearing BSB Series
a=60°
ID:12-100mm
Type
Corresponding
Code
Dimensions(mm) Load Rating(KN) Limited
Speed(r/min)
Sealed
Bearing Type
Bore Diameter
Seals
Pre-load
Matching
Precision
Cage
Bearing Type
Size series
Bore Diameter
Seals
Cage
Precision
Matching
Pre-load
BSB:Angular contact thrust ball bearings(60°contact angle) for ball screw
025: ID ĳ25mm
062: OD ĳ62mm
-: Open ; 2RZ: non-contact rubber seals on both sides; 2RS:seals on both sides
TN:Polyamide cage, guided by the rolling elements
G:Universal; DU:Two universal bearings;DB:Back-to-back;DF:Face-to-face;
Remarks
ID:15-100mm
Type NSK Code
Dimensions(mm) Load Rating(KN) Limited
Speed(r/min) Sealed

Designation System
Double Row Cylindrical Roller Bearing NN30 Series
Bearing Type
Bore Diameter
Tapered Hole Code
Precision
Radial Clearance
Oil hole
Cage
Bearing Type
Size series
Bore Diameter
Tapered Hole Code
Cage
Oil hole
Radial Clearance
Precision
Remarks
NN: Double Row Cylindrical Roller Bearing(Inner Ring with Ribs)
30: 30 Series
ID=Bore diameter code x 5(mm)
- : Cylindrical Bore ; K: Bearing with tapered bore, taper 1:12
TN:Polyamide cage, guided by the rolling elements ; M: Brass cage
- : No hole; W33: oil groove and lubrication holes in the outer ring
C1:Less than C2;C2:Less than normal;CN:greater than normal;C3: greater than C3;
SP: standard precision; UP: super precision
ID: 35-150mm
Type Dimensions(mm) Load Rating(KN) Limited Speed(r/min)
Weight
Grease Oil

Our company specializes in develope and produce special bearings for chemical fiber and
textile machinery, with high-speed, precision, high reliability, long life.
Maintain and replace bearing for chemical fiber equipment, high-speed spinning winder,
texturing, winder, Twister, silk machines, weaving, printing machine, and supply standard and
non-standard special bearings for equipment manufacturers.
Special Bearings:It's developed and designed according to the
installation and work condition of chemical fiber textile machinery;
Speed:12000r/min-2400r/min;
Working life: Continuous running more than 9000 hours;
Features: High speeds, super precision,high reliability,heat-
resistant, Fatigue resistance;
Type
Dimensions(mm)
ID OD W
Applications Bearing&Structure
Installation
postion
Type
Dimensions(mm)
ID OD W
Applications Bearing&Structure
Installation
position

To prevent dust and rust during the transport and stored,
the bearing surfaces will be coated with anti-rust oil before
shipment. Please remove the oil and clean bearing after
unpacking.
◆Check shaft and Housing.
Shaft and housing should be cleaned. It's not allowed to scratch,
burr, burrs, etc on the surfaces of bearings and spacers.
Check the shaft and bearing sizes, make sure compliance with the
bearing inner diameter tolerances
Measuring should be done in constant temperature room, using a
micrometer or dial bore gauge to measure when the temperature of
the measured object in a steady state(Multi-point measurement and
check whether there is a size out-of-tolerance obviously)
The method of mounting rolling bearings strongly affects their accuracy, life, and performance, so their mounting deserves careful attention.
Their characteristics should first be thoroughly studied, and then they should be mounted in the proper manner.
Bearing mounting methods depend on the bearing type and type of fit. As bearings are usually used on rotating shafts, the inner rings
require a tight fit. Bearings with cylindrical bores are usually mounted heating them to expand their diameter, the temperature 38°to 45°C .
Bearings are usually mounted in housings with a loose fit. However, in cases where the outer ring has an interference fit, a press may be
used. Bearings can be interference-fitted by cooling them before mounting using dry ice. In this case, a rust preventive treatment must be
applied to the bearing because moisture in the air condenses on its surface.
1.Press Fits
Fitting with a press is widely used for small bearings. A mounting tool is placed on the inner ring as shown in Fig, and the bearing is slowly
pressed on the shaft with a press until the side of the inner ring rests against the shoulder of the shaft. The mounting tool must not be
placed on the outer ring for press mounting, since the bearing may be damaged.
Before mounting, applying oil to the fitted shaft surface is recommended for smooth insertion. The mounting method using a hammer
should not be used.
2.Shrink Fits
Since press fitting large bearings requires a large force, a shrink fit is widely used. The bearings are first heated in oil to expand them
before mounting. This method prevents an excessive force from being imposed on the bearings and allows mounting them in a short time.
Because of the structure of Angular contact bearings, single bearings
only can carry loads in one direction,so the external load is applied to
only this side when mounted to the shaft and housing, rather than the
other side.
When install combined bearings into shaft and housing,the installed
sequence for DT&DB is different. It is important to note.
In the high speed and precision spindle, To prevent imbalance due to
nut tilt and thread gap when using nut tightening, shaft sleeve fixed
method will be applied. It's fixed by the interference between shaft and
inner diameter of sleeve. But if use this methods, the bearing is easier
to loose in continuous operation, it must be checked periodically.
Placed a wide spacer between the combination of angular contact ball
bearings,if the nut tightening force is too large, will cause deformation
of the inner ring spacer, resulting preload is greater than the set value.
So they should be mounted in the proper preload.
The filling sequence of grease after cleaning.
Lubricant filling is importance for the performance of bearing，it affects
temperature rise,initial run-in period,even causes burns.
So using the appropriate grease and quantity to fill in correct manner
Therefore, according to the operating conditions, bearings are filled with
the appropriate grease and quantity in correct manner.
The following filling methods are recommended:
◆Check requirements before filling.
Ensure no dirt in the bearing. For the high speed spindle bearing, we
suggest that, clean and degrease at first, then fill grease. for others
applications, also must to clean the anti-rust oil in bearing.
◆The grease quantity.
Angular contact ball bearing for high speed spindle — 15% ±2% of the
free space in the bearing.
Cylindrical roller bearing for high speed spindle — 10% ±2% of the free
space in the bearing.
◆Filling for Angular contact ball bearing
(1) Fill the grease evenly between each ball. If for the bearing with
Bakelite cages,should coated with a thin layer of grease on rolling
surface of cage.
(2)In order to the grease to be evenly distributed within the bearing,
should rotate the bearing by hands.
◆Filling for Cylindrical roller bearing.
(1) Coated with 80% grease on rolling surface of rollers, here, shouldn't
fill too much grease on the inside of cage. That's because the grease will
be difficult to spread, resulting in the rising of temperature will rise and
increasing of the running-in time.
(2) The grease on rolling surface will spread into the end of rolling, the
contact surface between cage and rolling and the entrance of hole, the
grease would to be evenly distributed within the bearing.
(3)Evenly Coated with remaining 20% grease on outer ring raceway
surface of housing.
◆Check the spacer
Spacer Parallelism of spacer on spindle should be controlled within
0.003mm(3ȝm),poor parallelism will cause bearing tilt, resulting in
poor precision, noise and other problems.
Cleaning The Bearings
And Related Parts
Cleaning Dimension
of Related Parts
Mounting Procesures
Precautions For Mounting
Procedure For Packing Grease
After Cleaning Bearings

◆Running Accuracy
In order to improve the precision of spindle. On the basis of
precision of parts, must improve the precision of operation.
①The axial runout of outer ring end face
Lightly tap the outer ring side face, controlled in 0.002mm
②Perpendicularity of bearing
Control the inclination of shaft in 0.005mm by adjust the
nuts.
③Concentricity of housing.
Be Controlled in 0.010mm
If can't reach above accuracy,must dismounting to recheck
the precision of parts.
Powered operation should be started slowly without load and the operation
should be observed carefully until it is determined that no abnormalities
exist, then gradually increase the speed, load, etc. to their normal levels.
Items to be checked during the test operation include the existence of
abnormal noise, excessive rise of bearing temperature, leakage and
contamination of lubricants, etc. If any abnormality is found during the test
operation, it must be stopped immediately and the machine should be
inspected. If necessary, the bearing should be dismounted for examination.
Although the bearing temperature can generally be estimated by the
temperature of the outside surface of the housing, it is more desirable to
directly measure the temperature of the outer ring using oil holes for
access.
The bearing temperature should rise gradually to the steady state level
within one to two hours after the operation starts. If the bearing or its
mounting is improper, the bearing temperature may increase rapidly and
become abnormally high. The cause of this abnormal temperature may be
an excessive amount of lubricant, insufficient bearing clearance, incorrect
mounting, or excessive friction of the seals.
In the case of high speed operation, an incorrect selection of bearing type
or lubricating method may also cause an abnormal temperature rise.
The sound of a bearing may be checked with a noise locater or other
instruments. Abnormal conditions are indicated by a loud metallic sound, or
other irregular noise, and the possible cause may include incorrect
lubrication, poor alignment of the shaft and housing, or the entry of foreign
matter into the bearing. The possible causes and countermeasures for
irregularities are listed in following Table.
◆Control of Preload after Mounting of
Bearings
If the preload of rolling bearing is set larger,
the rigidity of bearing is increased, but heat
generation is also increased, and in extreme
cases, seizure may occur. Therefore, it is
necessary to control optimum preload
carefully in response to operating condition.
After the mounting has been completed, a running test should be conducted to determine if the bearing has been
mounted correctly. Small machines may be manually operated to assure that they rotate smoothly. Items to be checked
include sticking due to foreign matter or visible flaws, uneven torque caused by improper mounting or an improper
mounting surface, and excessive torque caused by an inadequate clearance, mounting error, or seal friction. If there
are no abnormalities, powered operation may be started.
Irregularities Possible cause Countermeasures
Noise
Loud metallic
sound
Abnormal load
Incorrect mounting
Insufficient or improper lubricant
Contact of rotating parts
Dents generated by foreign
matters,corrosion,flaws,or
scratches on raceways
Brinelling
Flaking on raceway
Excessive clearance
Penetration of foreign particles
Flaws or flaking on balls
Improve the fit,internal clearance, preload,
position of housing shoulder,etc.
Improve the machining accuracy,alignment of
shaft&housing,accuracy of mounting method.
Replenish the lubricant or select another one.
Modify the labyrinth seal,etc.
Replace or clean the bearing,improve the
seals,and use clean lubricant.
Loud regular
sound
Irregular
sound
Replace the bearing,and use care when handling
Replace the bearing.
Improve the fit,clearance,and preload.
Replace or clean the bearing,improve the
seals,and use clean lubricant.
Abnormal temperature
rise
Insufficient or improper lubricant
Abnormal load
Incorrect mounting
Creep on fitted surface, excessive
seal friction
Replenish lubricant or select a better one.
Improve the fit,internal clearance,preload,or
position of housing shoulder.
Improve the machining accuracy and alignment
of the shaft and housing, accu-racy of
mounting,or mounting method.
Correct the seals,replace the bearing,or correct
the fitting or mounting.
Vibration (Radial
runout of shaft)
Brinelling
Flaking
Incorrect mounting
Penetration of foreign particles
Replace the bearing and use care when
handling bearing.
Correct the squareness between the shaft and
housing shoulder or side of spacer.
Replace or clean the bearing,improve the seals.
Leakage or discoloration
of lubricant
Too much lubricant. Penetration
by foreign matter or abrasion
chips
Reduce the amount of lubricant,select a stiffer
grease.Replace the bearing or lubricant.Clean
the housing and adjacent parts.
Inspection After Mounting
Operation Inspection

Items Type XEZ code SKF NSK FAG SNFA
Triple:
Double:
Quadruple:
Series
Precision
Contact
Angle
Matching
Pre-load
Ultra light series
Super light series
High-speed Super light
series
Light Series
High-speed Light Series
Standard Series
15°
25°
Universally Matchable
Light
Medium
Heavy

WUXI No.2 BEARING CO.,LTD
Add: No.1 LIJIANG ROAD, NEW DISTRICT,WUXI,214028 CHINA
Tel: +86(510)68937980
M/T: +86-15961897823
Fax: +86(510)85217940
Mail: xezchina@hotmail.com

Xez super precision bearing

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