Product Description Model NO.: 7210c The Number of Rows: Double Material: Bearing Steel Load Direction: Radial Bearing Model Type&Number: angular contact ball bearing 7210c Size(mm): 50*90*20 Clearance: C2, C0, C3, C4, C5 Bearing Material: Bearing Steel Gease Lub/Oil Lub(R/Min): 6300/8500 Trademark: ITJ Origin: China Rolling Body: Ball Bearings Outer Dimension: Small and Medium-Sized (60-115mm) Spherical: Aligning Bearings Separated: Separated Brand: Itj, NSK, SKF, NTN, Koyo, Timken, OEM Is Available Weight(Kg): 0.46 Vibration: Z1V1, Z2V2, Z3V3 Application: Front Wheel and Spindle Cr&Cor(Kn): 32.8/26.8 Specification: SGS Certificate HS Code: 8482103000 15 years' bearing manufacturer NSK SKF Super precision P4 bearings Angular Contact Ball Bearing 7210c Description Product name: Angular contact Ball Bearing
Precision: P4,super precision
Brand: NSK, SKF
Size:50*90*20mm
Package: One bearing in a transparent plastic bag+paper box
Payment: 30% deposit by T/T, 70% before shipment.
Delivery: Generally within 14 days after your deposit. It also depends on the quantity.

Application
7210C Bearing is widely used for Washing, drying equipment, electric welding, cutting equipment, canned food processing equipment, pipe heat exchanger, driving, roots pump, drop test machine, bar code equipment, refining equipment, flash drying machine, calender, knitting machine, pressing machine, handle, iron machine, pre-treatment equipment, metal welding machine, dyeing and printing machinery and equipment

Material	Gcr15(stainless steel) Material/stainless steel
Quality	P0,P6,P5,P4,P2
Cage,Retainer	MB , CA , CC ,E
size	50*90*20mm
type	angular contact ball bearing
Certificate	SGS
Service	OEM&ODM
Market	America,Europe,Africa,Oceania,Asia
Application	Washing, drying equipment, electric welding, cutting equipment, canned food processing equipment, pipe heat exchanger, driving, roots pump, drop test machine, bar code equipment, refining equipment, flash drying machine, calender, knitting machine, pressing machine, handle, iron machine, pre-treatment equipment, metal welding machine

2.More Products

boundary dimensions(mm)			Basic Load ratings(KN)		Limiting speeds(r/min)		Bearing No.	Weight(kg)
d	D	B	Cr	Cor	grease lub	oil lub
10	26	8	3.78	2.15	19000	28000	7000C	0.018
10	26	8	3.66	2.02	19000	28000	7000AC	0.018
10	30	9	4.18	2.24	18000	26000	7200C	0.03
10	30	9	4	2.28	18000	26000	7200AC	0.03
10	30	14.3	7.95	5.88	12000	17000	3200	0.054
10	35	11	5.4	2.61	20000	26000	7300AC	0.053
10	35	11	7.87	4.93	20000	26000	7300B	0.054
50	80	16	20.5	17.2	6700	9000	7010C	0.25
50	80	16	19.5	16.2	6700	9000	7010AC	0.25
50	90	20	32.8	26.8	6300	8500	7210C	0.46
50	90	20	31.5	25.2	6300	8500	7210AC	0.46
50	90	20	28.8	22.8	6300	8500	7210B	0.49
50	90	30.2	46	46.8	6300	6000	3210	0.78
50	110	27	53.5	47.2	5600	7500	7310C	1.08
50	110	27	55.5	44.5	5600	7500	7310AC	1.32
50	110	27	52.5	40.8	5600	7500	7310B	1.15
50	110	44.4	88	88.2	4000	7500	3310	1.96

basic conception
Angular Contact Ball Bearings
Single row angular contact ball bearings can only carry axial load in one direction, when bear radial load, will cause the additional axial force.And only limit shaft or shell axial displacement in one direction.Angular contact ball bearing contact Angle of 40 degrees, so it can bear a large axial load.Angular contact ball bearings are separated type design, inside and outside the circle of the shoulder on both sides of the high and low.In order to improve the load capacity of bearing, it will get on one shoulder and processing is low, so that the bearing can be loaded into the ball more.
Double row angular contact ball bearings can withstand the big radial direction load primarily radial and axial load and torque load, limit shaft of both axial displacement.Is mainly used for two-way axial displacement limit shaft and the shell parts of double row angular contact ball bearing can be skewed between inner and outer ring is limited, allowing Angle depends on the bearing internal clearance, bearing on the size, in the role of interior design, and the bearing force and moment, and the maximum allowable slope Angle should guarantee won't produce high additional stress in the bearing.If the Angle between bearing inner and outer ring, will affect the service life of bearing, falling bearing running accuracy at the same time, the running noise increases.Double row angular contact ball bearing usually use nylon cage entity or brass cage.Double row angular contact ball bearing should be paid attention to when installation, although the bearing can be subject to bi-directional load, but if one side has put the ball gap, should be paid attention to, don't let the noise of main axial load through a gap on one side of the river bank.In bearing should be paid attention to when using makes without ball gap on one side of the race carry the main load.
Double ball bearing in pairs
If double installed in pairs, make a pair of bearing outer ring relative, namely the wide end facing the wide end face, the narrow end face the narrow end.This can avoid the additional axial force, but also can be in two directions the shaft or shell limits in the range of the axial clearance.
Because of its outer ring raceway can have relative displacement in the horizontal axis, so can bear radial load and axial load at the same time, joint load (single row angular contact ball bearings can only carry axial load of single direction, therefore is generally installed in pairs) is often used to.
Retainers made of brass, synthetic resins, according to the bearing form, the conditions of use and distinguish.
Angular contact ball bearing is bearing manufacturer manufacturing abroad, more domestic more applied to imported equipment such as 3204 rs, angular contact ball bearing, etc.
Think back to back, back across the contact contact easier, the narrow side, wide edge, another side, wide, narrow edge in the outside, is back to back contact.
character
1, general with set of bearing
General distribution group of bearing is through special processing, when the bearing is installed close to each other , any combination can be established internal clearance or preload, and average load distribution, without having to use gaskets or similar device.
Paired bearings used in: when a single bearing load bearing capacity is insufficient configuration mode (using the channeling al) or when the bear joint load or effect of the axial load in both directions (use back to back or face-to-face way configuration).
2, the basic design of the bearing (cannot be used as a general group), configuration mode for a single bearing
The basic design of the single row angular contact ball bearing is mainly used in each position is only one bearing configuration.The width and the outstanding amount for common tolerance.Therefore not suitable for the two single row angular contact ball bearing close to install.
Precision
Angular contact ball bearing precision grade includes dimensional tolerance and revolving tolerance.From low to high precision is expressed as P0 (ordinary), P6 (P6X), P5, P4, P2.In addition, in the European and American brands also expressed in P3, P7 and P9 precision grade, P3 level equivalent to ISO and JIS standard P6, P7 is equal to the P4 level, P9 level equal to P2.
Related to the type
Angular contact ball bearings are: the type 7000 c (∝ = 15 °), type 7000 ac (∝ = 25 °) and 7000 b (∝ = 40 °) several types.This kind of lock on the outer ring of bearing, general inside and outside the circle cannot be separated, can bear radial and axial load and axial load in one direction.Carry axial load capacity is determined by contact Angle, the larger the contact Angle, is the ability to carry axial load.This kind of bearing can limit shaft or shell axial displacement in one direction.
Contact ball bearing limit rotational speed is higher, can bear radial load and axial load at the same time, also can withstand pure axial load, its axial load capacity is determined by contact Angle, and with the contact Angle increases.
Single row angular contact ball bearings
Single row angular contact ball bearings can only carry axial load in one direction, when bear radial load, will cause the additional axial force, must be applied to the corresponding reverse load, therefore, this kind of bearings are generally used in pairs.Double row angular contact ball bearings can withstand the bigger radial direction load primarily radial, axial two-way joint load and torque load, it can limit shaft or shell two-way axial displacement, the contact Angle of 30 degrees.[1]
7 bearing code:
Installation Angle contact ball bearing in pairs
Installation Angle contact ball bearing in pairs can afford to two-way joint mainly consisting of radial load, axial load, also can withstand pure radial load.Serial configuration can only carry axial load in single direction, the other two configurations can carry axial load in either direction.This type of bearings in general by submitting users, manufacturers matching combination pairs after installation preloading interference, ring and ball in the axial preload charge state, thus increasing the entire group bearing support stiffness and rotation as a single fine degrees.
Rear back-to-back configuration, code-named DB (such as 70000 / DB), back-to-back pairs of bearing load to the bearing axis line separate.Role can withstand axial load in both directions, but on the direction of each load only by a bearing.Back-to-back installed bearings provide relatively high bearing configuration rigidity, and can withstand the overturning moment.
Across the surface configuration, rear code-named DF (such as 70000 / DF), face to face of load bearing of pairs of lines to the bearing axis convergence.Role can withstand axial load in both directions, but on the direction of each load only by a bearing.This configuration as back-to-back pairs of high rigidity, and is not suitable for under negative moment.This configuration rigidity and the ability to withstand the overturning moment than the DB configuration form, the bearing can be subject to bi-directional load load;
Rear tandem configuration, code-named DT (such as 70000 / DT), serial configuration, load line parallel to the radial and axial load Shared by bearing the uniform.However, the group can only carry on a direction axial load.If the effect of axial load in the opposite direction, or if there is a composite load, you must add a third bearing relatively series matching bearing adjustment.This configuration can also be in the same series of three or more bearings, bearing place but can only carry axial load in single direction.Usually, in order to balance and limit shaft axial displacement, another supporting point should be installed to withstand another direction axial load bearing.
Bearing code: 0
Structure deformation types
The characteristics of double row angular contact ball bearing can be also bear the combined load of radial and axial load, limit shaft of both axial displacement.Compared with bidirectional Thrust Ball Bearing, this kind of bearing limit rotational speed is higher, the contact Angle is 32 degrees, good rigidity, affordable overturn torque, widely used in the car of the front wheel hub (some models with same size also double row circular cone roller bearings).
Deformation of the structure of double row angular contact ball bearing has four kinds:
Type A: the standard design of the bearing outside diameter less than or equal to 90 mm.No ball gap, so can bear equal two-way axial load.Using light glass fiber reinforced nylon 66 cage, bearing temperature rise is small.
Type A: outer diameter greater than the standard design of the 90 mm bearing.Side with ball gap, equipped with z steel plate stamping cage or entity brass cage.
E: reinforced structure, the side with the ball gap, can hold more ball, therefore higher bearing capacity.
Sides with dust cover and two sides with seals, type A and type E design of double row angular contact ball bearings can carry dust cover (non-contact) or sealing ring on both sides (contact).The interior of the sealed bearing have rust lithium grease filling, operating temperature generally between 30 degrees to 110 degrees.Don't need to use lubrication, no longer heating before installation.
Double row angular contact ball bearing should be paid attention to when installation, although the bearing can be subject to bi-directional load, but if one side has put the ball gap, should be paid attention to, don't let the noise of main axial load through a gap on the side of the river bank.
main application
Single row angular contact ball bearings, machine tool spindle, high frequency motor, gas turbine, centrifugal separator, small car front wheel, differential pinion shaft, booster pump, drilling platform, food machinery, dividing head, filling machine, low noise type cooling tower, electrical equipment, coating equipment, machine tool trough plate, arc welding machine
Double row angular contact ball bearing, oil pump, roots blower, air compressor, all kinds of transmission, fuel injection pump, printing machinery, planetary reducer, extraction equipment, cycloid reducer, food packaging machinery, electric welding machine, electric, square box, gravity type spray gun, wire stripping machine, axle shaft equipment, chemical machinery, testing analysis
Installation techniques
High speed precision angular contact ball bearing, mainly used for high speed rotating load lighter, bearings and high precision, high speed, low temperature rise, low vibration and service life.Often for high speed motorized spindle Bearing parts installed in pairs, is the key to the high-speed motorized spindle surface grinding machine fittings.
The main technical indicators:
1. The bearing precision index: more than GB / 307.1 94 P4 level precision
2. High speed performance indicators: dmN value 1.3 ~ 1.3 x 106 / min
3. The service life (on average) : > 1500 h
High speed precision angular contact ball bearing service life had a lot to do with the installation, the following should be paid attention to
1. The bearing installation should be clean, clean room, bearing should be carefully selected, bearing with baffle passes through grinding, and in keeping the baffle on inner and outer contour under the premise of baffle parallelism should be controlled below 1 um.
2. Bearing should be cleaned before installed and when cleaning inner ring ramp up, flexible hand induction, no stagnation, air-dried, into the specified amount oil, if oil mist lubrication oil should be in a small amount of oil mist;
3. The bearing installation should use specialized tools, force uniform, do not knock;
4. Bearing deposit should be clean and ventilated, non-corrosive gas, relative humidity is not more than 65%, long-term storage should be rust on a regular basis.
Maintenance method
1, when the bearing running to a period of time (or the guaranteed maintenance period), all bearing down;[2]
2, clean with clean diesel oil or kerosene soaking bearing, if you have open the sealing cover cleaning best technological conditions;
3, dry cleaning oil after cleaning, appearance inspection for damage;
4, with a 150 mm or so, angular contact ball bearing inner diameter equal diameter rods (best is a hollow tube), one end fixed a bearing;
5, rapidly rotating bearing at the same time with the hand, will stick (wind) on the other end against the ear microphone or audio amplifier on the apology to bearing rotation noise;
After 6, fixed bearing transverse strike sticks, check whether the bearing wear loose phenomenon;
7, loose, the rotation noise is too big, have serious defect bearings should be eliminated, with the same generation;
Eight, take a bucket will right amount of grease (high quality p redictors oil) gently melt (not hot), will be tested to no bubble overflow bearings in the bucket.Cooling before take out the bearing grease, residual grease quantity is little.Cools remove grease angular contact ball bearings, residual amount of grease.According to the need to determine how much grease residues.
9, with a soft cloth or tissue wipe the grease outside bearings on the same assembly to the pulley, the maintenance work is come to an end.

Main products ,Packing&Testing

Packing details	1 piece/Transparent plastic bag/inner box,1 plastic bag/carton/medium package,60 pieces/master carton 1 pc net weight:0.015kg,gross weight:0.016kg medium package:10*25*9mm master carton:20*75*90mm
Delivery details	5-25 working days after payment

Company and factory information
we made industry and trading company integrated.meaning have our own factory,manufacturing Deep Groove Ball Bearing,Tapered Roller Bearing, Pillow Block bearingand spherical roller bearing,professionally
engaged in imported bearings sales, which main imported products of NSK,NTN,KOYO,and TIMKEN and so on. We also have products
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c.our products were produced under strict quality test system.
d.More than many years industry experience
e.Accept OEM, customization, customers' logo
f.Our factory has various sizes bearing in stock.So we will arrange to send delivery within 3 days  after received the payment from the buyers.
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Products are inspected qualified when they leave the factory as stipulated in the national standard and customer requirements. The service life of bearing reached the international standard and customer requirements. According to the national standard regulations and customer requirements for bearing inner and outer packing, Ensure that no problem during the transit. Any quality problem appeared in the bearing products, it should be solved according to the provisions of the customer service commitment in time. If customer have any special quality requirement to the bearing products
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