Single row deep groove ball bearings

The single row deep groove ball bearings have relatively deep raceways on both rings without a filling slot and they are non-separable. By optimum size of balls and by their conformity to the raceways high load ratings are achieved.

They can carry axial and radial loads in both directions and are suitable even for high rotation speeds. These bearings are manufactured in a broad selection of types and are the most common rolling bearing type.

Single row deep groove ball bearings


 

Design specifications

Main dimensions

Main dimensions of single row deep groove ball bearings specified in the dimension tables are in accordance with the international standards ISO 15. Snap ring groove dimensions comply with the international standards ISO 464.

Single row deep groove ball bearings

Bearings with shields or seals

Single row deep groove ball bearings with sealing on one or on both sides are manufactured with metal shields (Z, -2Z, or ZR, -2ZR) or with seals (RS, -2RS or RSR, -2RSR). The shields create a non-contact sealing.

The bearings are manufactured in the original design with shoulders for shields on the inner ring (Z, -2Z) or in the new design with a shield and a flat collar of the inner ring (ZR, -2ZR).

Single row deep groove ball bearings


The sealing rings made of rubber, vulcanized on metal reinforcing ring, provide an effective friction type sealing. The bearings are manufactured in the design with rounded shoulders on the inner ring (RS, -2RS) or in a new design with a seal and a flat collar of the inner ring (RSR, -2RSR). Bearings with seals are suitable for usage within the temperature range from -30°C to 110°C. Bearing deliveries with sealing capacity within 180°C (RS2, -2RS2, resp. RSR2, -2RSR2), or eventually delivery of bearings with other sealing design, must be negotiated in advance. Shields and seals are inserted in the recess of the outer ring and these are not removable.

Bearings sealed on both sides (-2Z, -2RS, or -2ZR, -2RSR) are filled with a quality grease the properties of which usually ensure the lubrication during the whole bearing life under normal operating conditions. The bearings of this design cannot be relubricated. They can be used within the operating temperature range from -30°C to 110°C. The delivery of bearings with different grease should be discussed with the supplier in advance.

Single row deep groove ball bearings


Grease

For bearings sealed on both sides, the designation of the grease filling different from standard grease is indicated by a symbol combination. The first two letters indicate the operating temperature range (a symbol in accordance with STN 02 4608) and the third identifies the grease name.

TL – Grease for low operating temperatures (from -60°C to 100°C)
TM – Grease for medium operating temperatures (from -35°C to 140°C)
TH – Grease for high operating temperatures (from -30°C to 200°C)
TW – Grease for low and high operating temperatures (from -40°C to 150°C)
Note: The symbols of grease for medium operating temperatures need not to be marked on the bearings.

Bearings with snap ring groove

The single row deep groove ball bearings with a snap ring groove (N) can be easily axially fixed in the housings and without high requirements on the space simplifying the arrangement design. For bearings with a groove in the outer ring, snap rings corresponding to STN 02 4605 are used (commercial designation R and the number indicating the outside diameter D of the corresponding bearing, e. g. R47). Bearings with a snap ring groove and a snap ring are designated by the suffix NR, e. g. 6204NR. Snap rings for the bearings with a snap ring groove are delivered separately. The bearings with a snap ring groove can also be delivered in the modification with shields or seals (ZN, -2ZN or RSN, -2RSN). The delivery of these bearings must be discussed in advance.

Single row deep groove ball bearings


Tapered bore

For some less demanding arrangements, e. g. in agricultural machines, etc., some sizes of single row deep groove ball bearings of type 62 and 63 with a tapered bore (K), taper 1:12 are manufactured. These bearings are also manufactured in a design with shields on both sides. The bearings are fixed on the cylindrical shaft by means of adapter sleeves of types H2, H3 or directly on the tapered shaft.

Cage

The single row deep groove ball bearings of the basic design are equipped with a pressed cage made of steel sheet, guided on balls, which is not designated. Bearings can be shipped also with massive steel (mark: F), or with massive brass (mark: M), cage, guidance of which may be on balls or some of the rings. In special cases the bearings are produced with different types of cages: bearings with a solid polyamide cage (TNH, TNGH), with a solid cage of textite (TB). The supply of these bearings should be discussed in advance.

Tolerances

Single row deep groove ball bearings are produced in tolerance classes P0 and P6. For special arrangements requiring high precison or for arrangements with a high rotation speed, the bearings in higher tolerance classes P5 and P4 are used. The bearings in higher tolerance class P6E are used for rotating electric machines. The limit values of deviations in tolerances and the operation are specified in ISO 492.

Radial clearance

Commonly produced single row deep groove ball bearings have normal radial clearance which is not indicated. In specific cases bearings with radial clearance C2 (smaller than normal clearance) or with the radial clearance C3, C4, C5 (greater than normal clearance) can be produced (ISO 5753).

Vibration level

Commonly manufactured single row ball bearings have a normal vibration level checked by the manufacturer. For special arrangements bearings with reduced vibration level (C6) are produced.

Combination of symbols

The symbols for the tolerance classes, internal bearing clearances and vibration levels are combined with the simultaneous omission of the symbol C for the second and the following special bearing characteristics e.g.:

P6 + C3 = P63
C3 + C6 = C36
P6 + C3 + C6 = P636

6202 P63
6305-2RS C36
6204-2Z P636


Stabilisation for operation at higher temperature

For operating temperature higher than 120°C specially stabilized single row deep groove ball bearings with stabilized dimensions for operating temperature from 150°C to 400°C (S0, S1, S2, S3, S4,S5) are produced. Delivery of stabilized bearings should be discussed in advance.

Misalignment

For single row ball bearings only small mutual misalignment of bearing rings is permissible, therefore alignment deviation of seating surfaces can be very small. Misalignment causes additional load of the bearing and thus its life is shortened. Values of permissible misalignment at normal operating conditions are shown in the table.

Bearing TypeLoad
low (Fr < 0,15.Cor) heavy (Fr ≥ 0,15.Cor)
618,619,160,60 2´ až 6´5´ až 10´
62,63,64 5´až 10´8´ až 16´

Radial equivalent dynamic load

Single row deep groove ball bearings:

Pr = Fr
Pr = 0,56.Fr + Y.Fa

for Fa/Fr ≤ e
for Fa/Fr > e


Factors

Fa/CoreY
0.0250.222
0.0400.241.8
0.0700.271.6
0.1300.311.4
0.2500.371.2
0.5000.441

Single row deep groove ball bearings


Factor Y values are valid, if the bearings on the journal and in the housing will be fitted in tolerances recommended for small and medium loads and during operation significant reduction of radial clearance due to operating temperature does not come into being (temperatures difference between inner and outer ring max 10°C).

Radial equivalent static load

Single row deep groove ball bearings:

Por = 0,6.Fr + 0,5.Fa

for (Por ≥ Fr)


Designation

The designation of basic designs and common modifications of the bearings are specified in the dimension tables. Modification of the basic design is designated with additional symbols according to STN 02 4608. The meaning of the most used symbols for single row deep groove ball bearings is in the table.

SymbolExample of designationMeaning
RS6009RSSeal on one side
RSR6205RSRSeal on one side adhering to flat surface of inner ring
-2RSR6212-2RSRSeal on both sides adhering to flat surface of inner ring
Z6206ZMetal shield on one side
ZN6305ZNMetal shield on one side and snap ring groove in outer ring opposite to metal shield
-2Z6308-2ZMetal shield on both sides
-2ZR6005-2ZRMetal shields on both sides adhering to flat surface of inner ring
K6204-2ZKTapered bore, taper 1:12
N6407NSnap ring groove in outer ring
NR6307NRSnap ring groove in outer ring and inserted snap ring
TNH6207TNHPlastic cage guided on balls
TB6210TBMachined cage made of textite guided on the inner ring
P66205 P6Higher tolerance class than standard
P6E6204-2Z P6EHigher tolerance class for rotating electric machines
P56203 P5Higher tolerance class than P6
P46004 P4Higher tolerance class than P5
C26213 C2Radial clearance less than normal
C36305-2ZR C3Radial clearance greater than normal
C46007-2RS C4Radial clearance greater than C3
C56302-2ZR C5Radial clearance greater than C4
C66315 C6Reduced vibration level
R...6211 R10-20Radial clearance in non-standardized range
SO6205 SOStabilisation for operating temeprature to 150°C
S16304 S1Stabilisation for operating temeprature to 200°C
S26302 C5S2Stabilisation for operating temeprature to 250°C
S36310 C5S3Stabilisation for operating temeprature to 300°C
S46306 C5S4Stabilisation for operating temeprature to 350°C
S56309 C5S5Stabilisation for operating temeprature to 400°C
TP6205-2Z P6E TPBearings produced according to special technical conditions agreed with the customer