Single Row Deep Groove Ball Bearings (with shields or seals)

Boundary dimensions of the single row deep groove ball bearings given in the dimension tables with the exception of separable single row ball bearings of types E and BO, correspond to the international standard ISO 15. The snap ring groove dimensions comply with the international standard ISO 464.

The single row deep groove ball bearings with sealing on one or on both sides are manufactured with metallic shields (Z, -2Z or ZR, -2ZR) or with seals (RS, -2RS or RSR, -2RSR). Bearings with shields have a non-contact sealing. The bearings are manufactured in the original design with steps for shields on the inner ring (Z, -2Z) or, in the new design, with a shield and a smooth rib on the inner ring (ZR, -2ZR).

The sealing rings made of rubber, vulcanized on metallic reinforced rings, provide an effective friction type seal. The bearings are manufactured in the design with rounded steps on the inner ring (RS, 2RS) or, in a new design, with a seal and a smooth rib on the inner ring (RSR, -2RSR).

Bearings with seals can be used within the temperature range from -30°C to 110°C. Supplies of bearings with seals within the operating temperature range from -60°C to 180°C (RS2, 2RS2) should be negotiated with the supplier in advance. Shields and seals are firmly fixed in the groove of the outer ring and these are not removable.

Bearings with sealings 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 and can be used within the operating temperature range from -30°C to 100°C. The supply of bearings with a different grease should be negotiated with the supplier in advance.

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 of which indicate the operating temperature range (a symbol in accordance with STN 02 4608) and the third symbol identifies the grease name.

TL - Grease for low operating temperatures (from -60°C up to 100°C)​
TM - Grease for medium operating temperatures (from -30°C up to 110°C)​
TH - Grease for high operating temperatures (from -30°C up to 200°C)​
TW - Grease for low and high operating temperatures (from -40°C up to 150°C)
Note: The symbols of greases for medium operating temeperatures need not be marked on the bearings.

For some less demanding applications, 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.

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.

These bearings are produced with different types of cages for special applications. Namely, bearings with a solid polyamide cage (TNH, TNGH) and a machined brass cage (M). The supply of these bearings should be negotiated in advance.

The limiting values of the dimensional and running accuracy deviation correspond to ISO 492. An exception is made only for the Single row deep groove ball bearings are commonly manufactured within the tolerance class P0 and P6. For special applications requiring high accuracy or for applications with a high rotational speed, the bearings in the higher tolerance classes P6, P5 and P4 are used. The bearings in higher tolerance class P6E are used for rotating electric machines.

The limiting values of the dimensional and runing accuracy deviation correspond to ISO 492. An exception is made only for the separable single row ball bearings of types E or B0 the outer diameter D of which has the limiting deviation +0.01/0.00 mm.

The bearings in the tolerance classes P5 and P4 are made of higher quality materials such as electroslag or vacuum remelted bearing steels.

The commonly manufactured single row deep groove ball bearings have a normal radial clearance which is not indicated. For special arrangements the bearings with a reduced radial clearance (C2) or with an increased radial clearance (C3, C4, C5) are supplied.

The currently manufactured single row deep groove ball bearings have a normal vibration level determined by the manufacturer. For special applications with high requirements on noisless operation, bearings with reduced vibration level are supplied (C6).

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

P6 + C3 = P63                6004 P63

C3 + P6 = C36                6303-2RS C36

P6 + C3 + C6 = P636      6204-2Z P636

For arrangements with a higher operating temperature than 120°C, special heat treated-stabilised-single row deep groove ball bearings are supplied the form stability of which at operating temperature 150°C up to 400°C (S0, S1, S2, S3, S4, S5) is ensured.

The supply of stabilised bearings should be negotiated with the supplier in advance.

For single row deep groove ball bearings only small mutual misalignment of bearing rings is permissible, therefore alignment deviation of seating surfaces can be very small. Misalignment causes additional loading of the bearing and thus its life is shortened.

Values of permissible misalignment at normal operating conditions are shown in the table.

Bearing type                                         Load
                              light (Fr<0,15 Cor)            heavy (Fr ≥ 0.15 Cor)
618,619,160,60              2′ to 6′                                 5′ to 10′
62,63,64                        5′ to 10′                                8′ to 16′

Pr = Fr for Fa/Fr ≤ e

Pr = 0,56 Fr + YFa for Fa/Fr > e


Coeficients

Fa/Cor      e        Y

0.025     0.22     2
0.040     0.24    1.8
0.070     0.27    1.6
0.130     0.31    1.4
0.250     0.37    1.2
0.500     0.44     1

Por = 0,6 Fr + 0,5 Fa (Por ≥ Fr)

The bearing designation in the basic or current modified design is indicated in the dimension tables. The modification of the basic design is designated by additional symbols (prefixes and suffixes) in accordance with STN 02 4608. The meaning of the most frequently used symbols for the single row deep groove ball bearings is indicated in the table.