Prefix and Suffix of UGT bearings

Prefix and Suffix of UGT bearings

The commonly used supplementary codes by UGT Bearings are listed in the following and the meanings are explained as:

 

Prefix


L

Removable inner or outer ring of a separable bearing

R

Bearing without removable inner or outer ring (only suitable for needle roller bearings of type NA)

K

Roller and cage assembly

WS

Shaft washer of a cylindrical roller thrust bearings.

GS

Housing washer of a cylindrical roller thrust bearing

KOW

Thrust bearing without shaft washer

KIW

Thrust bearing without housing washer

LR

Bearing with removable inner ring or outer ring and rolling elements assembly

 

 

 

 

 

 

Suffix

 

Internal design

A

Deviating or modified internal design

B

Standard type (the design contents can be altered according to different bearing structures)

C Example:

B indicates nominal contact angle a = 40 for angular contact ball bearings.

D  

indicates the increased contact angle for tapered roller bearings. C indicates nominal

E          

contact angle a = 15 for angular contact ball bearings.  E indicates the reinforce bearings.

AC                

Nominal contact angle a =25  for angular contact ball bearings

D                  

Split bearings 

 

 

 

 

 

Codes of seats, shields and external designs

K               

Tapered bore, taper 1:12 on diameter

K30           

Tapered bore, taper 1:30 on diameter

R               

Bearing with flanged outer ring

N               

Bearing with snap ring groove in outer ring

NR             

Bearing with snap ring groove in outer ring and snap ring

-RS            

Embedded case rubber seal at one side of the bearing (rubbing seal)

-2RS          

Embedded case rubber seals at both sides of the bearing (rubbing seal)

-RZ            

Embedded case rubber seal at one side of the bearing(non-rubbing seal)

-2RZ          

Embedded case rubber seals at both sides of the bearing (non-rubbing seal)

-Z              

Bearing with shield at one side

-2Z             

Bearing with shields at both sides 

 

 

 

 

 

 

 

 

 

Codes of bearing materials

/HE       

Rings, rolling elements and cages, or only rings and rolling elements, made of electro slag refined bearing steel ZGCr15, ZGCr15SiMn

/HA       

Rings, rolling elements and cages, or only rings and rolling elements, made of vacuum arc-melted steel

/HU       

Rings, rolling elements and cages or only ring and rolling elements, made of unable hardening stainless steel lCr18Ni9Ti

/HV       

Rings, rolling elements and cages, or only ring and roiling elements, made of hardening stainless steel (/HV-9Crl8, /FM-9Crl8Mo)

/HN       

Rings and rolling elements, made of heat-resisting bearing steel  (/HN-Cr4Mo4V, /HNI-Cr 14Mc)4, /liN2-Crl5Mo4V, /1-fN3-Wl8Cr4V)

/HC       

Rings rolling elements, or only rolling elements, made of carburized steel (/HC-2OCr2Ni4 A, /HCI-2OCr2MoA, /liC2-15Mn)

/HP       

Rings and rolling elements, made of beryllium bronze or other anti-magnetic materials.

/HG

Rings and rolling elements, or only rings, made of other bearing steels     (HG-5CrmnMo, /HG1-55SiMoVA)

F           

Solid cage, made of steel, nodular cast iron or powder metallurgy, the additional figure indicates the different materials

            

Fl-carbon steel, F2-graphite steel, F3-nodular cast iron, F4-powder metallurgy

Q          

Bronze solid cage, the additional figure indicates the different materials

¡¡

Q1-ferro-aluminium manganese bronze, Q2-ferro-silicon zinc bronze,

¡¡

Q3-nichrome silicon bronze, Q4-alurninium bronze

M

Brass solid cage

L           

Light alloy solid cage, the additional figure indicates the different materials L-LY11CZ, L1-LY12CZ

T           

Phenolic resin solid cage

TH        

Glass-fiber-reinforced phenolic resin cage (basket type)

TN        

Molded cage with engineering plastic, the additional figure indicates the different

¡¡

materials   TNI-nylon, TN2-polysulfone, TN3-polyimide TN4-polycarbonate, TN5-polyfoffnal dehydez

J             

Pressed steel plate cage, the additional figure indicates the different materials

Y           

Pressed brass plate cage, the additional figure indicates the different materials

SZ         

Cage is made of spring steel wire or spring plate

V           

Full complement beating (without cage) 

 

 

Tolerance and clearance

/P6        

Tolerance class conforms to standard group 6

/P6X      

Tolerance class conforms to standard class 6x

/P5       

Tolerance class conforms to standard class 5

/P4       

Tolerance class conforms to standard class 4

/P2

Tolerance class conforms to standard class 2 

/Cl       

Internal clearance conforms to standard group 1

/C2       

Internal clearance conforms to standard group 2

/C3       

Internal clearance conforms to standard group 3

/C4       

internal clearance conforms to standard group 4

/C5       

Internal clearance conforms to standard group 5

/C9       

Bearing internal clearance differs from the present standard, the tolerance class and  clearance can be simplified into /P63R43, when they need to be expressed  simultaneously 

 

 

 

 

 

 

 

Codes of bearing arrangement 

/DB       

Back-to-back arrangement

/DF       

Face-to-face arrangement

/DT       

Tandem arrangement 

 

 

Other bearing features

/Z        

limited values of the vibration acceleration level, the additional figures indicate the different limited values, as Z1, Z2, Z3

/V        

Limited values of the vibration speed level, the additional figures express the different values, as V1, V2, V3

/S0       

The bearing rings are tempered through heat treatment, and the operating temperature is up to 150 C

/SI       

The bearing rings are tempered through heat treatment, and the operating temperature is up to 200 C

/S2       

The bearing rings are tempered through heat treatment, and the operating temperature is up to 250 C

/S3       

The bearing rings are tempered through heat treatment, and the operating temperature is up to 300 C

/S4       

The bearing rings are tempered through beat treatment, and the operating temperature is up to 350 C

/W20      

The bearing with three lubrication holes in outer ring

/W26

The bearing with six lubrication holes in outer ring 

/W33      

The bearing with a lubrication groove and six lubrication holes in outer ring

/W33X

The bearing with three lubrication holes and six lubrication holes in outer ring

/AS       

The beating with lubrication hole in outer ring, the additional figure shows the numbers of oil hole (used for needle roller hearings)

/IS

The bearing is filled with special grease for high temperature, grease quantities differ  from the standard filling are identified by an additional letter

/HT         

The bearing is filled with special grease for high temperature, grease quantities differ  from the standard filling are identified by an additional letter

¡¡

A:: grease quantity is less than standard filling

¡¡

B: grease quantity is more than standard filling

¡¡

C: full quantity of grease

/LT         

Bearing with the grease for lower temperature, the additional letter is the same meaning as /HT

/MT        

Bearing with the grease for medium temperature, the additional letter is the same meaning as /HT

/LHT        

Bearing with the grease for lower or higher temperature, the additional letter is the same meaning as /HT

/Y          

Combinations of the letter Y with another letter or figure can identify differences from the standard design which are not concluded by other established suffixes

¡¡

 /YA  Modification of structures (comprehensive expression)

¡¡

 /YA1 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA2 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA3 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA4 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA5 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA6 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA7 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA8 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA9 The outer surface of bearing outer ring differs from that of standard design

¡¡

 /YA10 The outer surface of bearing outer ring differs from that of standard design

  1. If suffix Y with another letter or additional figure are presented in bearing designations, the product drawings or the supplementary specifications must be looked up.
  2. In this catalog, UGT designations of inch size tapered roller bearings are basically corresponding to TIMKEN designations.

 

Tolerance class of UGT Bearings

UGT

0

6

5

4

2

ISO

0

6

5

4

2

ANSI

ABEC-1

ABEC-3

ABEC-5

ABEC-7

ABEC-9

SKF

0

P6

P5

P4

P2

DIN

0

P6

P5

P4

P2

JIS

0

6

5

4

 

 

Chemical Composition of Steels for UGT bearings (%)

Element

C

Si

Mn

Cr

Ni

Mo

P

S

Cu

GCr15

0.95~1.05

0.15~0.35

0.25~0.45 

1.40~1.64

<=0.025

<=0.025

GCr15SiMn

0.95~1.05

0.45~0.75

0.95~1.25 

1.40~1.64

<=0.025

<=0.025

G20CrNi2Mo

0.17~0.23

0.15~0.40

0.40~0.70 

0.35~0.65

1.60~2.00

1.60~2.00

<=0.030

<=0.030

<=0.25

G20Cr2Ni4

0.17~0.23

0.15~0.40

0.30~0.60 

1.25~1.75

3.25~3.75

<=0.030

<=0.030

<=0.25

50Mn

0.48~0.56

0.17~0.37

0.70~1.00 

42CrMo

0.38~0.45

0.17~0.37

0.50~0.80 

0.90~1.20

0.15~0.25

 

Equivalent Designations of UGT bearings

UGT (PRC-Germany)

ASTM(USA)

DIN(GERMANY)

JIS(JAPAN)

GCr15

AISI 52100

DIN100Cr6

JIS SUJ2

GCr15SiMn

 

DIN100CrMn67

 

G20CrNi2Mo

AISI 4320

 

JIS SNCM415

G20Cr2Ni4

AISI 3316

 

 

50Mn

AISI 1551

 

 

42CrMo

 

DIN 42CrMo4

JIS SCM 440

 

 

 

 

 

 

 

 

 

Radial Internal Clearances in Deep Groove Ball Bearings

Nominal bore diameter d (mm)

C2

Normal

C3

C4

C5

Over

Incl.

min

max

min

max

min

max

min

max

min

max

2.5

6

0

7

2

13

8

23

6

10

0

7

2

13

8

23

14

29

20

37

10

18

0

9

3

18

11

25

18

33

25

45

18

24

0

10

5

20

13

28

20

36

20

48

24

30

1

11

5

20

13

28

23

41

30

53

30

40

1

11

6

20

15

33

28

46

40

64

40

50

1

11

6

23

18

36

30

51

45

73

50

65

1

15

8

28

23

43

38

61

55

90

65

80

1

15

10

30

25

51

46

71

65

105

80

100

1

18

12

36

30

58

53

84

75

120

100

120

2

20

15

41

36

66

61

97

90

140

120

140

2

23

18

48

41

81

71

114

105

160

140

160

2

23

18

53

46

91

81

130

120

180

160

180

2

25

20

61

53

102

91

147

135

200

180

200

2

30

25

71

63

117

107

163

150

230

200

225

2

35

25

85

75

140

125

195

175

265

225

250

2

40

30

95

80

160

145

225

205

300

250

280

2

45

35

105

90

170

155

245

225

340

280

315

2

55

40

115

100

190

175

270

245

370

315

355

3

60

45

125

110

210

195

300

275

410

355

400

3

70

55

140

130

140

225

340

315

460

400

450

3

80

60

170

150

270

250

380

350

510

450

500

3

90

70

190

170

300

280

420

390

570

500

560

10

100

80

210

190

330

310

470

440

630

560

630

10

110

90

230

210

360

340

520

490

690

630

710

20

130

110

260

240

400

380

570

540

760

710

800

20

140

120

290

270

450

430

630

600

840

800

900

20

160

140

320

300

500

480

700

670

940

900

1000

20

170

150

350

330

550

530

770

740

1040

1000

1120

20

180

160

380

360

600

580

850

820

1150

1120

1250

20

190

170

410

390

650

630

920

890

1260

 

 

 

 

 

Radial Internal Clearances of Self-aligning ball Bearings with cylindrical bore (um)

Nominal bore
 diameter d (mm)

C2

Normal

C3

C4

C5

over

incl.

min

max

min

max

min

max

Min

max

min

max

10

14

2

10

6

19

13

26

21

35

30

48

14

18

3

12

8

21

15

28

23

37

32

50

18

20

4

14

10

23

17

30

25

39

34

52

24

30

5

16

11

24

19

35

29

46

40

58

30

40

6

18

13

29

23

40

34

53

46

66

40

50

6

19

14

31

25

44

37

57

50

71

50

65

7

21

16

36

30

50

45

69

62

88

65

80

6

24

18

40

35

60

54

83

76

108

60

100

9

27

22

48

42

70

64

96

89

124

100

120

10

31

25

56

50

83

75

114

105

145

120

140

10

38

30

68

60

100

90

135

125

175

140

160

15

44

35

80

70

120

110

161

150

210

 

 

Radial Internal Clearances of Self-aligning ball Bearings with tapered bore  (um)

Nominal bore
 diameter d (mm)

C2

Normal

C3

C4

C5

over

incl.

min

max

min

max

min

max

Min

max

min

max

18

24

7

17

13

26

20

33

28

42

37

55

24

30

9

20

15

28

23

39

33

50

44

62

30

40

12

24

19

35

29

46

40

59

52

72

40

50

14

27

22

39

33

52

45

65

58

79

50

65

18

32

27

47

41

61

56

80

73

99

65

80

23

39

35

57

50

75

69

98

91

123

80

100

29

47

42

68

62

90

84

116

109

144

100

120

135

56

50

81

75

108

100

139

130

170

120

140

40

68

60

98

90

130

120

165

155

205

140

160

45

74

65

110

100

150

140

191

180

240

 


 

 

 

 

 

 

Radial Internal Clearances in Cylindrical Roller Bearings with Cylindrical bore (um)

Nominal bore
 diameter  d (mm)

C2

Normal

C3

C4

C5

over

incl.

min

max

min

max

min

max

Min

max

min

max

 

10

0

25

20

45

35

60

50

75

10

24

0

25

20

45

35

60

50

75

65

90

24

30

0

25

20

45

35

60

50

75

70

95

30

40

5

30

25

50

45

70

60

85

85

105

40

50

5

35

30

60

50

80

70

100

95

125

50

65

10

40

40

70

60

90

80

110

110

140

65

80

10

45

40

75

65

100

90

125

130

165

80

100

15

50

50

85

75

110

105

140

155

190

100

120

15

55

50

90

85

125

125

165

180

220

120

140

15

60

60

105

100

145

145

190

200

2454

140

160

20

70

70

120

115

165

165

215

225

275

160

180

25

75

75

125

120

170

170

220

250

300

180

200

35

90

90

145

140

195

195

250

275

330

200

225

45

105

105

165

160

220

220

280

305

365

225

250

45

110

110

175

170

235

235

300

330

395

250

280

55

125

125

195

190

260

260

330

370

440

280

315

55

130

130

205

200

275

275

350

410

485

315

355

65

145

145

225

225

305

305

385

455

535

355

400

100

190

190

280

280

370

370

460

510

600

400

450

110

210

210

310

310

410

410

510

565

665

450

500

110

220

220

330

330

440

440

550

625

735

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Radial Internal Clearances of Spherical Roller Bearings with cylindrical bore (um)

Nominal bore
 diameter d (mm)

C2

Normal

C3

C4

C5

over

incl.

min

max

min

max

min

max

min

max

min

max

14

18

10

20

20

35

35

45

45

60

60

75

18

24

10

20

20

35

35

45

45

60

60

75

24

30

15

25

25

40

40

55

55

75

75

95

30

40

15

30

30

45

45

60

60

80

80

100

40

50

20

35

35

55

55

75

75

100

100

125

50

65

20

40

40

65

65

90

90

120

120

150

65

80

30

50

50

80

80

110

110

145

145

180

80

100

35

60

60

100

100

135

135

180

180

225

100

120

40

75

75

120

120

160

160

210

210

260

120

140

50

95

95

145

145

190

190

240

240

300

140

160

60

110

110

170

170

220

220

280

280

350

160

180

65

120

120

180

180

240

240

310

310

390

180

200

70

130

130

200

200

260

340

340

430

430

200

225

80

140

140

220

220

290

380

380

470

470

225

250

90

150

150

240

240

320

320

420

420

520

250

280

100

170

170

260

260

350

350

460

460

570

280

315

110

190

190

280

280

370

370

500

500

630

315

355

120

200

200

310

310

410

550

550

690

690

355

400

130

220

220

340

340

450

450

600

600

750

400

450

140

240

240

370

370

500

500

660

660

820

450

500

140

260

260

410

410

550

550

720

720

900

500

560

150

280

280

440

440

600

600

780

780

1000

560

630

170

310

310

480

480

650

650

850

850

1100

630

710

190

350

350

530

530

700

700

920

920

1190

710

800

210

390

390

580

580

770

770

1010

1010

1300

800

900

230

430

430

650

650

860

860

1120

1120

1440

900

1000

260

480

480

710

710

930

930

1220

1220

1570

1000

1120

290

530

530

780

780

1020

1020

1330

1330

1720

1120

1250

320

580

580

860

860

1120

1120

1460

1460

1870

1250

1400

350

640

640

950

950

1240

1240

1620

1620

2080