SOLUTION OF COMPOSITE BEARING

MOSTUF

Filament wound
Composite
Bearings

Maintenance-free

www.soltri.com / info@ soltri.com

SOLTRI CORP.

11-88, Songrim-Dong, Dong-Gu, Incheon, KOREA 401-076 Tel : 82-32-761-2323 / Fax : 82-32-761-2322

CATALOG No. ST-N04-0907

Designed by IN&DESIGN COMMUNITY, Korea

Contents
1. Introduction .......................................... 4 p
2. Features & Benefits ............................. 4 p
3. Material Structure ................................ 5 p
4. Applications ......................................... 6 p

MOSTUF T
- Standard type
- Specially woven (PTFE + synthetic fiber)
bearing layer
- Ideal for low speed/high load application

5. Bearing Performance .......................... 7 p

6. Design Consideration .......................... 11 p
7. Installation ........................................... 14 p
8. Size Table ............................................ 14 p
9. Machining ............................................ 19 p

MOSTUF P
- Standard type
- Filled PTFE bearing layer
- Very good friction and wear properties

MOSTUF S
- Machinable bearing layer
- Filament wound synthetic fiber with
graphite additions
- Suitable for large size composite bush

MOSTUF F
- Lower frictional coefficient and wear rate
than MOSTUF T
- Filament wound twisted (PTFE+synthetic
fiber) layer with graphite additions

2/3

SOLTRI
Introduction
The demands for environmentally friendly sliding bearing which is maintenance-free
even under harsh conditions and free from contaminations caused by grease or oil
are increasing gradually.
MOSTUF composite bearings are self-lubricating sliding materials with high loadcarrying capacity to be applied under slow speed rotating, oscillating and
reciprocating movements.
MOSTUF composite bearings have excellent sliding performance when they are
applied to some place where lubrication is not possible or not allowed since they
maintain good wear resistance and low coefficient of friction.

Features & Benefits

MOSTUF composite bearings have excellent self -lubricating and wear resistance
during non-lubricated conditions since they have various types of low frictional
bearing layers as per each application. Backing layer which is composed of filament
wound fiberglass-epoxy is non-corrosive entirely and can support maximum
140MPa of dynamic load. They have strong resistance against shock, vibration load
and there is negligible stick-slip.
Self-lubricating
Maintenance-free dry operation
Low frictional coefficient and low wear rate
High load-carrying capacity
Multiple motion capability
Light weight
Non-sensitive to impact and shock load
Negligible stick-slip
Non-corrosive material
Non-metallic material
Non-conductive material
Low swelling

Material Structure
MOSTUF composite bearings have two layers that
are manufactured by a filament winding process.
And various bearing layers are available as per
applied conditions
Bearing layer of MOSTUF T is composed of a
proprietary designed woven structure of PTFE and
high strength synthetic fibers with specially
formulated solid lubricant additions.

Backing Layer

MOSTUF T

Bearing Layer

MOSTUF P

MOSTUF S

Backing Layer

MOSTUF F

Bearing Layer
Fig.1 - Microstructure of MOSTUF composite bearings

These PTFE fiber and solid lubricant are the main

mechanism for allowing the MOSTUF T product to
operate in a self-lubricating condition.
MOSTUF composite bearings maintain high
compressive strength with fiberglass-epoxy backing
layer which is manufactured at a specific angle by
filament winding process.

Composites / Bearings / Technologies

4/5

Bearing Performance

Applications

Mechanical Properties

MOSTUF composite bearings are sliding

bearing to be applied in the condition of non-

Mechanical properties of MOSTUF T composite bearing is shown in Table 1.

Fig.2 shows the test device for the testing of load-deformation of MOSTUF T bearing in
accordance with MIL-B-85560 specifications.

lubricated high load. They have excellent

mechanical properties and fatigue strength.
MOSTUF composite bearings are suitable for
rotating, oscillating and reciprocating

Material Handling Equipment,

Forklifts, Scissor lift

Generally, composite bearing accompanies permanent deformation in addition to the

elastic deflection under radial load. This permanent deformation results from
compaction between bearing layer and backing layer. Fig.3 shows the relation between
elastic deflection and permanent set under radial load.

movements under slow speed. And they

exhibit excellent performance in vacuum and
Properties

Units

Values

Maximum compressive strength

MPa

430

Static loading strength

MPa

240

Radial rupture strength

MPa

550

Hardness

HRM

95

Density

g/cm3

2.0

underwater circumstance.
Valves and Actuators
Hydraulic & Pneumatic
cylinders, Linear slide,
Butterfly valves

Table 1. - Mechanical properties of MOSTUF T composite bearing

Construction Equipment
Excavators, Cranes,
Street sweepers

Recreation Applications
Ski lifters, Snow mobiles,
Fitness equipment, Golf carts

Fig.2 - Typical static radial load test setup of MOSTUF bearing

Test method : MIL-B-85560
Specimen : 25.50x 38.16x12.70L
Apparatus : Dynamic UTM MTS-322.41

Agricultural Equipment
Tractors, Combines,
Seed-treatment units

Marine Equipment
Underwater robots,
Stern drive on speed motors
Fig.3 - Permanent set and deflection of MOSTUF T bearing

6/7

Bearing Properties

Bearing Wear
Units

MOSTUF T

MOSTUF P

static

MPa

240

140

dynamic

MPa

140

35

m/sec

0.2

2.5

MPa x m/sec

1.8

2.0

0.03~0.12

0.03~0.08

Maximum operating temp.

160

180

Minimum operating temp.

-100

-100

Maximum load
Maximum sliding speed
Maximum PV value
Frictional coefficient(dry)

Table 2. - Bearing properties of MOSTUF composite bearings

Bearing wear occurs due to many kinds of factors. Fig.6 shows the test results under
bearing pressure of 60 MPa at room temperature. There shows rapid wear during
initial thousands of cycles. During this period, there happens transfer of PTFE on the
surface of shaft and redistribution of fiber on the sliding direction, resulting into
smooth bearing surfaces. After some initial wear, wear rate shows steady progress.
Direct wear stays under 0.12mm after 256,000 cycles.

Fig.6 - Direct wear of MOSTUF T bearing

(Tested by Powertech Labs Inc., B.C, Canada)

Fig.4 - Over view of bearing tester

Fig.7 - MOSTUF T test

bushing and journal

Coefficient of Friction
The dynamic coefficient of friction for MOSTUF composite bearing is between 0.03 ~ 0.12,
depending upon load, type of movement, sliding speed, operating temperature, micro finish
of mating surface. Fig.5 shows the change of dynamic coefficient of friction under oscillating
load. At the beginning of test, coefficient of friction is being kept up on steady-state
conditions

Fig.7 shows the shaft and bearing after finishing all test cycles.
Fig.8 shows contact area which was highly polished and journal
contact surface had a significant amount of wear debris(lubricant
film) adhering to the contact face. Fig.9 shows close up view of
bushing center of contact surface. There did not appear to be any
damage to the bearing surface other than minor polishing.
Fig.8 - Close up view of
MOSTUF T journal
contact surface.

Fig.5 - Dynamic coefficient of friction of MOSTUF T bearing

(Tested by Powertech Labs Inc., B.C, Canada)

Fig.9 - Close up view of bushing

center of contact surface
8/9

Design Considerations

Thermal Properties
Operating temperature of MOSTUF composite bearing is between -100 ~ +160C. And coefficient of
thermal expansion is similar to the coefficient of thermal expansion of steel. So the bearing can exhibit its
performance without separating from housing even though exposed extreme temperature change.

MOSTUF material manufactured by filament winding process is a

sliding bearing for many applications by utilizing various kinds of
bearing layers and configurations.

MOSTUF T

Coefficient of thermal
expansion(25~150 )

Unit

MOSTUF
Bearing

Steel

Aluminum

/m

13 10-6

11 10-6

24 10-6

Composite Bearing

Standard type
Specially woven (PTFE+synthetic fiber)
bearing layer
Ideal for high load, low speed applications

Table 3. - Coefficient of thermal expansion for MOSTUF bearing composites, steel, and aluminum
MOSTUF P

Chemical Properties
MOSTUF composite bearings have resisting power to various kinds of chemical substances. Also they have
dimensional stability even after exposed into sea water or fresh-water for a long time.
Alcohols
Methanol
Ethyl alcohol
Allyl alcohol
Butyl alcohol
Propyl alcohol
Isopropanol
Hydroxy aceton
Solvents
Aceton
Toluene
Methyl ethyl keton
Trichloroethane
Benzene
Acids(10%)
Hydrochloric acid
Boric acid
Acetic acid
Sulphuric acids
Nitric acids
Carbonic acids
Hydrofluoric acid
Oils
Gear oil
Motor oil
Hydraulic oil
Linseed oil
Fuels
Kerosene
Jet fuel
Diesel
Petroleum
Sodium hydroxid

Table 4. - Chemical resistance of MOSTUF bearing composites

Salts
Sodium acetate
Sodium carbonate
Ammonium nitrate
Ammonium chloride
Magnesium sulphate
Gases
Butane
Ozone
Nitrogen
Natural gas
Acetylene
Hydrogen
Fluorine
Chlorine gas

Filled PTFE bearing layer

Excellent dry movement performance
Very good friction and wear properties

MOSTUF S

Composite Bearing

ID & OD of bearing can be machined

Suitable for large size bushing over I.D. 200

MOSTUF F

Composite Bearing

Filament wound twisted PTFE/synthetic

fiber layer with graphite additions
Low coefficient of friction and excellent
wear resistance

Alkalies(10%)
Sodium hydroxide
Calcium hydroxide
Ammonium hydroxide
Magnesium hydroxide
Others
Freon
Formaldehyde
Sodium nitrate
Ethylene glycol
Ammonia
100% water

resistant

Composite Bearing

Bearing Proportions
Optimum performance for MOSTUF composite bearing can be
achieved by specifying a length to inside diameter ratio(L/d) ranging
from 0.5 to 2.0. When the values of L/d are between above ranges,
wear debris can escape from the bearing easily and the bearing
became less sensitive to shaft deflection and misalignment.

non resistant

L/d values of more than 2.0 are not recommended but where long
bearing has been indicated it is advisable to consider using two
bearings with a small gap between them. If the value of the L/d is less
than 0.5, there would a possibility for some cracking on the edge of
bearing due to stress concentrations.

10 / 11

Bearing Pressure
Bearing pressure is defined as maximum load operated on the projected bearing
area. Load capacity will be declined as temperature rises and it will be increased as
temperature goes down. And load capacity will be affected by the type of operated
load. Generally, load capacity of MOSTUF composite bearing is 140MPa when
uniform load is operated on the bearing and 100MPa under dynamic or oscillating
load that cause fatigue stress.

Bearing Speed
Allowable maximum speed for MOSTUF T composite bearing is 0.2m/s. It exhibits
excellent performance when it operates at a slow speed under high load. In case
bearing speed is very high, too much of frictional heat would be occurred and
allowable bearing pressure would be decreased accordingly.

Bearing Pressure

P(MPa) =
d

Bearing Speed
Rotation
V(m/s)=5.24 10-5dN

Filament wound Bearing Composites

Oscillation
V(m/s)=5.82 10-7dc
SOLUTION OF COMPOSITE BEARING

where

W = radial load(N)
L = bearing length(mm)
c = cycling rate(cycles/min)

d = bearing ID(mm),
N = rotation speed(revs/min),
= half turning angle(degree)

MOSTUF

Bearing PV
The value of PV can be calculated by multiplying bearing pressure by bearing
velocity and it indicates surface running speeds and loads under which a bearing
can safely operate. Allowable PV limit for MOSTUF T composite bearing is 1.8MPa.
m/s. Frictional heat and wear rate would be increased rapidly in case of over PV limit.

Shaft Material & Lubrication

The hardness and micro finish of shaft have important effect on the performance of
bearing. The hardness of shaft should be minimum 35 HRc and micro finish should
be minimum 0.2~0.4 Ra in order to minimize wear rate while keeping low frictional
coefficient. When roughly finished shaft is applied to a bearing, bearing wear rates
would be increased rapidly.
Because MOSTUF bearing does not require lubrication there is no need to worry
about lubrication and shaft seizure. We recommend shafts of chromium plated steel
or stainless steel. The best way to increase durability of equipment is to use nitrified
shaft.
If lubricants are used with MOSTUF bearings, they can emit heat on contact surface
easily and they can extend the life cycle of bearing by sending out wear particles
which were flowed in from outside. And we recommend to use hydrocarbon oils and
greases. But do not use fluorocarbon oils and greases, as they may soften the PTFE
fibers, increasing the bearing's wear rate.
12 / 13

Installation

M O S T UF M e tr i c S i z e

MOSTUF bearing is installed into a housing by press fit method.

Bearing Sizes
ID

+0.070
+0.040

15, 20, 25

12h7

0
- 0.018

17H7

+0.018
0

0.022~0.070

0.020~0.136

15

+0.145
+0.095

20

+0.075
+0.045

15, 20, 25

15h7

0
- 0.018

20H7

+0.021
0

0.024~0.075

0.020~0.139

16

+0.145
+0.095

21

+0.075
+0.045

15, 20, 25

16h7

0
- 0.018

21H7

+0.021
0

0.024~0.075

0.020~0.139

18

+0.195
+0.115

23

+0.095
+0.045

15, 20, 25

18h7

0
- 0.018

23H7

+0.021
0

0.024~0.095

0.020~0.189

20

+0.196
+0.116

25

+0.096
+0.046

15, 20, 30

20h7

0
- 0.021

25H7

+0.021
0

0.025~0.096

0.020~0.192

22

+0.196
+0.116

27

+0.096
+0.046

15, 20, 30

22h7

0
- 0.021

27H7

+0.021
0

0.025~0.096

0.020~0.192

25

+0.196
+0.116

30

+0.096
+0.046

20, 30, 40

25h7

0
- 0.021

30H7

+0.021
0

0.025~0.096

0.020~0.192

28

+0.200
+0.120

34

+0.100
+0.050

20, 30, 40

28h7

0
- 0.021

34H7

+0.025
0

0.025~0.100

0.020~0.196

30

+0.200
+0.120

36

+0.100
+0.050

20, 30, 40

30h7

0
- 0.021

36H7

+0.025
0

0.025~0.100

0.020~0.196

35

+0.200
+0.120

41

+0.100
+0.050

30, 40, 50

35h7

0
- 0.025

41H7

+0.025
0

0.025~0.100

0.020~0.200

40

+0.200
+0.120

48

+0.100
+0.050

30, 40, 60

40h7

0
- 0.025

48H7

+0.025
0

0.025~0.100

0.020~0.200

45

+0.230
+0.130

53

+0.105
+0.055

30, 40, 60

45h7

0
- 0.025

53H7

+0.030
0

0.025~0.105

0.025~0.230

50

+0.230
+0.130

58

+0.105
+0.055

40, 50, 60

50h7

0
- 0.025

58H7

+0.030
0

0.025~0.105

0.025~0.230

55

+0.245
+0.145

63

+0.120
+0.070

40, 55, 70

55h7

0
- 0.030

63H7

+0.030
0

0.040~0.120

0.025~0.235

60

+0.245
+0.145

70

+0.120
+0.070

40, 60, 80

60h7

0
- 0.030

70H7

+0.030
0

0.040~0.120

0.025~0.235

65

+0.245
+0.145

75

+0.120
+0.070

50, 60, 80

65h7

0
- 0.030

75H7

+0.030
0

0.040~0.120

0.025~0.235

70

+0.245
+0.145

80

+0.120
+0.070

50, 70, 90

70h7

0
- 0.030

80H7

+0.030
0

0.040~0.120

0.025~0.235

75

+0.275
+0.175

85

+0.125
+0.075

50, 70, 90

75h7

0
- 0.030

85H7

+0.035
0

0.040~0.125

0.050~0.265

80

+0.275
+0.175

90

+0.125
+0.075

60, 80, 100

80h7

0
- 0.030

90H7

+0.035
0

0.040~0.125

0.050~0.265

85

+0.275
+0.175

95

+0.125
+0.075

60, 80, 100

85h7

0
- 0.035

95H7

+0.035
0

0.040~0.125

0.050~0.270

90

+0.275
+0.175

105

+0.125
+0.075

60, 80, 120

90h7

0
- 0.035

105H7

+0.035
0

0.050~0.135

0.050~0.270

XX

95

+0.310
+0.185

110

+0.135
+0.085

60, 80, 120

95h7

0
- 0.035

110H7

+0.035
0

0.050~0.135

0.050~0.295

100

+0.310
+0.185

115

+0.135
+0.085

80, 100, 120

100h7

0
- 0.035

115H7

+0.035
0

0.050~0.135

0.050~0.295

110

+0.315
+0.190

125

+0.135
+0.085

80, 100, 120

110h7

0
- 0.035

125H7

+0.040
0

0.050~0.140

0.050~0.300

120

+0.340
+0.215

135

+0.165
+0.090

100, 120, 150

120h7

0
- 0.035

135H7

+0.040
0

0.050~0.165

0.050~0.325

130

+0.340
+0.215

145

+0.165
+0.090

100, 120, 150

130h7

0
- 0.040

145H7

+0.040
0

0.050~0.165

0.050~0.330

140

+0.340
+0.215

155

+0.165
+0.090

100, 150, 180

140h7

0
- 0.040

155H7

+0.040
0

0.050~0.165

0.050~0.330

150

+0.340
+0.215

165

+0.165
+0.090

120, 150, 180

150h7

0
- 0.040

165H7

+0.040
0

0.050~0.165

0.050~0.330

MOSTUF Bearing Parts Numbering System

1. Metric Size

MM

Ex ; MMT 708050 ( MOSTUF T Bearing, ID70

OD80

50mm Long)

XX

OD
XX

2. Inch Size
INCH SIZE
BM

Ex ; BMT 323608 ( MOSTUF T Bearing, ID 2

Bearing Layer

T:
P:
S:
F:

Bearing Layer
T, P, S, F
X

OD 2.25

1 Long)

ID
in 1/16

OD
in 1/16

L
in 1/8

XX

XX

XX

woven PTFE/synthetic fiber

filled PTFE tape
filament wound synthetic fiber with graphite
filament wound twisted PTFE/synthetic fiber with graphite

Housing

Running
Clearance

17

Fig.11 - Drawing of MOSTUF composite bearings

ID

Shaft

Interference
Fit

+0.140
+0.090

Size Table

Bearing Layer
T, P, S, F
X

Recommended Sizes

12

Fig.10 - Installation of MOSTUF composite bearings

METRIC SIZE

OD

Standard
Length

Size not listed above may be quoted upon request

14 / 15

M O ST U F T B e a r i n g s / St a n d a r d W a l l - 1 /8
Bearing Nominal Size
Part No.
ID OD

Standard
Length

BMT 0812

1/2 3/4

1/2, 3/4,1

BMT 1014

5/8 7/8

1/2, 3/4,1

BMT 1216

3/4 1

1/2, 3/4,1

BMT 1418

7/8 1-1/8

3/4, 7/8, 1-1/4

BMT 1620

1 1-1/4

3/4, 1, 1-1/2

BMT 1822

1-1/8 1-3/8

3/4, 1, 1-1/2

BMT 2024

1-1/4 1-1/2

1, 1-1/4, 1-1/2

BMT 2226

1-3/8 1-5/8

1, 1-1/4, 1-1/2

BMT 2428

1-1/2 1-3/4

1-1/4, 1-1/2, 2

BMT 2630

1-5/8 1-7/8

1-1/4, 1-1/2, 2

BMT 2832

1-3/4 2

1-1/4, 1-1/2, 2

BMT 3236

2 2-1/4

1-1/2, 2, 3

BMT 3640

2-1/4 2-1/2

1-1/2, 2, 3

BMT 3842

2-3/8 2-5/8

1-1/2, 2, 3

BMT 4044

2-1/2 2-3/4

2, 2-1/2, 3

BMT 4246

2-5/8 2-7/8

2, 2-1/2, 3

BMT 4448

2-3/4 3

2, 2-1/2, 3

BMT 4852

3 3-1/4

2, 2-1/2, 3

BMT 5256

3-1/4 3-1/2

2, 2-1/2, 3

BMT 5660

3-1/2 3-3/4

2, 4

BMT 6064

3-3/4 4

2, 4

BMT 6468

4 4-1/4

2, 4

BMT 6872

4-1/4 4-1/2

2, 4

BMT 7276

4-1/2 4-3/4

2, 4

BMT 7680

4-3/4 5

2, 4

BMT 8084

5 5-1/4

2, 4

Size not listed above may be quoted upon request

M O S T U F T B e a r i n g s / H ea v y W a l l - 1 / 4

Recommended Size

ID

Interference Fit

OD
Housing

Shaft

0.5040
0.5020
0.6290
0.6270
0.7555
0.7525
0.8805
0.8775
1.0055
1.0025
1.1335
1.1305
1.2555
1.2525
1.3830
1.3790
1.5080
1.5040
1.6330
1.6290
1.7580
1.7540
2.0080
2.0040
2.2580
2.2540
2.3850
2.3810
2.5100
2.5060
2.6370
2.6330
2.7620
2.7580
3.0140
3.0100
3.2640
3.2600
3.5140
3.5100
3.7640
3.7600
4.0140
4.0100
4.2640
4.2600
4.5140
4.5100
4.7640
4.7600

0.7515
0.7505
0.8765
0.8755
1.0025
1.0005
1.1275
1.1255
1.2525
1.2505
1.3785
1.3765
1.5025
1.5005
1.6285
1.6265
1.7535
1.7515
1.8785
1.8765
2.0035
2.0015
2.2535
2.2515
2.5040
2.5020
2.6290
2.6270
2.7540
2.7520
2.8790
2.8770
3.0040
3.0020
3.2540
3.2520
3.5040
3.5020
3.7540
3.7520
4.0040
4.0020
4.2540
4.2520
4.5040
4.5020
4.7540
4.7520
5.0040
5.0020

0.7500
0.7495
0.8750
0.8745
1.0000
0.9995
1.1250
1.1245
1.2500
1.2495
1.3750
1.3745
1.5000
1.4995
1.6250
1.6245
1.7500
1.7495
1.8750
1.8745
2.0000
1.9995
2.2505
2.2495
2.5005
2.5020
2.6255
2.6245
2.7505
2.7495
2.8755
2.8745
3.0005
2.9990
3.2505
3.2490
3.5010
3.4990
3.7510
3.7490
4.0010
3.9990
4.2510
4.2490
4.5010
4.4990
4.7510
4.7490
5.0010
4.9990

0.4990
0.4985
0.6240
0.6235
0.7490
0.7485
0.8745
0.8740
0.9990
0.9985
1.1250
1.1245
1.2490
1.2485
1.3745
1.3735
1.4995
1.4990
1.6245
1.6240
1.7495
1.7490
1.9995
1.9985
2.2490
2.2485
2.3750
2.3740
2.4995
2.4985
2.6245
2.6235
2.7495
2.7485
2.9995
2.9985
3.2495
3.2485
3.4995
3.4985
3.7495
3.7485
3.9995
3.9985
4.2495
4.2485
4.4995
4.4985
4.7495
4.7485

0.0020
0.0005
0.0020
0.0005
0.0030
0.0005
0.0030
0.0005
0.0030
0.0005
0.0040
0.0015
0.0030
0.0005
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0010
0.0045
0.0015
0.0045
0.0015
0.0045
0.0015
0.0045
0.0015
0.0050
0.0015
0.0050
0.0015
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0015
0.0050
0.0010
0.0050
0.0010

5.0140
5.0100

5.2540
5.2520

5.2510
5.2490

4.9995
4.9985

0.0050
0.0010

Bearing Nominal Size

Part No.
ID OD

Standard
Length

BMT 0816

1/2 1

1/2, 3/4,1

BMT 1018

5/8 1-1/8

1/2, 3/4,1

BMT 1220

3/4 1-1/4

1/2, 3/4,1

BMT 1422

7/8 1-3/8

3/4, 7/8, 1-1/4

BMT 1624

1 1-1/2

3/4, 1, 1-1/2

BMT 1826

1-1/8 1-5/8

3/4, 1, 1-1/2

BMT 2028

1-1/4 1-3/4

1, 1-1/4, 1-1/2

BMT 2230

1-3/8 1-7/8

1, 1-1/4, 1-1/2

BMT 2432

1-1/2 2

1-1/4, 1-1/2, 2

BMT 2634

1-5/8 2-1/8

1-1/4, 1-1/2, 2

BMT 2836

1-3/4 2-1/4

1-1/4, 1-1/2, 2

BMT 3240

2 2-1/2

1-1/2, 2, 3

BMT 3644

2-1/4 2-3/4

1-1/2, 2, 3

BMT 3846

2-3/8 2-7/8

1-1/2, 2, 3

BMT 4048

2-1/2 3

2, 2-1/2, 3

BMT 4250

2-5/8 3-1/8

2, 2-1/2, 3

BMT 4452

2-3/4 3-1/4

2, 2-1/2, 3

BMT 4856

3 3-1/2

2, 2-1/2, 3

BMT 5260

3-1/4 3-3/4

2, 2-1/2, 3

BMT 5664

3-1/2 4

2, 4

BMT 6068

3-3/4 4-1/4

2, 4

BMT 6472

4 4-1/2

2, 4

BMT 6876

4-1/4 4-3/4

2, 4

BMT 7280

4-1/2 5

2, 4

BMT 7684

4-3/4 5-1/4

2, 4

BMT 8088

5 5-1/2

2, 4

Size not listed above may be quoted upon request

Recommended Size

ID

Interference Fit

OD
Housing

Shaft

0.5040
0.5020
0.6290
0.6270
0.7555
0.7525
0.8805
0.8775
1.0055
1.0025
1.1335
1.1305
1.2555
1.2525
1.3830
1.3790
1.5080
1.5040
1.6330
1.6290
1.7580
1.7540
2.0080
2.0040
2.2580
2.2540
2.3850
2.3810
2.5100
2.5060
2.6370
2.6330
2.7620
2.7580
3.0140
3.0100
3.2640
3.2600
3.5140
3.5100
3.7640
3.7600
4.0140
4.0100
4.2640
4.2600
4.5140
4.5100
4.7640
4.7600

1.0025
1.0005
1.1275
1.1255
1.2525
1.2505
1.3785
1.3765
1.5025
1.5005
1.6285
1.6265
1.7535
1.7515
1.8785
1.8765
2.0035
2.0015
2.1285
2.1265
2.2535
2.2515
2.5040
2.5020
2.7540
2.7520
2.8790
2.8770
3.0040
3.0020
3.1290
3.1270
3.2540
3.2520
3.5040
3.5020
3.7540
3.7520
4.0040
4.0020
4.2540
4.2520
4.5040
4.5020
4.7540
4.7520
5.0040
5.0020
5.2540
5.2520

1.0000
0.9995
1.1250
1.1245
1.2500
1.2495
1.3750
1.3745
1.5000
1.4995
1.6250
1.6245
1.7500
1.7495
1.8750
1.8745
2.0000
1.9995
2.1255
2.1245
2.2505
2.2495
2.5005
2.4995
2.7505
2.7495
2.8755
2.8745
3.0005
2.9990
3.1255
3.1240
3.2505
3.2490
3.5010
3.4990
3.7510
3.7490
4.0010
3.9990
4.2510
4.2490
4.5010
4.4990
4.7510
4.7490
5.0010
4.9990
5.2510
5.2490

0.4990
0.4985
0.6240
0.6235
0.7490
0.7485
0.8745
0.8740
0.9990
0.9985
1.1250
1.1245
1.2490
1.2485
1.3745
1.3740
1.4995
1.4990
1.6245
1.6240
1.7495
1.7490
1.9995
1.9985
2.2490
2.2480
2.3750
2.3740
2.4995
2.4990
2.6245
2.6240
2.7495
2.7485
2.9995
2.9985
3.2495
3.2485
3.4995
3.4985
3.7495
3.7485
3.9995
3.9985
4.2495
4.2485
4.4995
4.4985
4.7495
4.7485

0.0030
0.0005
0.0030
0.0005
0.0030
0.0005
0.0040
0.0015
0.0030
0.0005
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0010
0.0045
0.0015
0.0045
0.0015
0.0045
0.0015
0.0050
0.0015
0.0050
0.0015
0.0050
0.0015
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010

5.0140
5.0100

5.5040
5.5020

5.5010
5.4990

4.9995
4.9985

0.0050
0.0010
16 / 17

Machining

M O ST U F T B e a r i n g s / T h in W a l l - 1 / 1 6
Bearing Nominal Size
Part No.
ID OD

Standard
Length

BMT 0810

1/2 5/8

1/4, 1/2,1

BMT 1012

5/8 3/4

1/4, 1/2,1

BMT 1214

3/4 7/8

1/2, 3/4,1

BMT 1416

7/8 1

3/4, 7/8, 1-1/4

BMT 1618

1 1-1/8

3/4, 1, 1-1/2

BMT 1820

1-1/8 1-1/4

3/4, 1, 1-1/2

BMT 2022

1-1/4 1-3/8

1, 1-1/4, 1-1/2

BMT 2224

1-3/8 1-1/2

1, 1-1/4, 1-1/2

BMT 2426

1-1/2 1-5/8

1-1/4, 1-1/2, 2

BMT 2638

1-5/8 1-3/4

1-1/4, 1-1/2, 2

BMT 2830

1-3/4 1-7/8

1-1/4, 1-1/2, 2

BMT 3234

2 2-1/8

1-1/2, 2, 3

Size not listed above may be quoted upon request

Recommended Size

ID

Interference Fit

OD

0.5040
0.5020
0.6290
0.6270
0.7555
0.7525
0.8805
0.8775
1.0055
1.0025
1.1335
1.1305
1.2555
1.2525
1.3830
1.3790
1.5080
1.5040
1.6330
1.6290
1.7580
1.7540
2.0080
2.0040

0.6265
0.6255
0.7515
0.7505
0.8765
0.8755
1.0025
1.0005
1.1275
1.1255
1.2525
1.2505
1.3785
1.3765
1.5025
1.5005
1.6285
1.6265
1.7535
1.7515
1.8785
1.8765
2.1285
2.1265

ID

OD

Housing

Shaft

0.6250
0.6245
0.7500
0.7495
0.8750
0.8745
1.0000
0.9995
1.1250
1.1245
1.2500
1.2495
1.3750
1.3745
1.5000
1.4995
1.6250
1.6245
1.7500
1.7495
1.8750
1.8745
2.1255
2.1245

0.4990
0.4985
0.6240
0.6235
0.7490
0.7485
0.8745
0.8740
0.9990
0.9985
1.1250
1.1245
1.2490
1.2485
1.3745
1.3735
1.4995
1.4990
1.6245
1.6240
1.7495
1.7490
1.9995
1.9985

0.0020
0.0005
0.0020
0.0005
0.0020
0.0005
0.0030
0.0005
0.0030
0.0005
0.0030
0.0005
0.0040
0.0010
0.0030
0.0005
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0010

Machining of OD
We recommend to grind the outside diameter of composite bearing which is composed
of filament wound fiberglass-epoxy.

Machining of ID
Machining of Mostuf bearing ID depends on the material of bearing layer. MOSTUF T
and MOSTUF F bearing can not be machined because their bearing layers consist of
PTFE fiber. MOSTUF P bearing which consists of filled PTFE Tape and MOSTUF S
bearing which consists of high strength synthetic fiber can be machined by lathe.

Cutting of Bearing
It is desirable to utilize a diamond wheel in order to cut composite bearing materials. In
case of cutting MOSTUF composite bearing on a lathe, it should be cut from inside
diameter in order to prevent any damage in bearing layer.

SOLTRI

M O ST U F P Be a r in g s
Bearing Nominal Size
Part No.
ID OD

Standard
Length

BMP 0812

1/2 3/4

1/2, 3/4,1

BMP 1014

5/8 7/8

1/2, 3/4,1

BMP 1216

3/4 1

1/2, 3/4,1

BMP 1418

7/8 1-1/8

3/4, 7/8, 1-1/4

BMP 1620

1 1-1/4

3/4, 1, 1-1/2

BMP 1822

1-1/8 1-3/8

3/4, 1, 1-1/2

BMP 2024

1-1/4 1-1/2

1, 1-1/4, 1-1/2

BMP 2226

1-3/8 1-5/8

1, 1-1/4, 1-1/2

BMP 2428

1-1/2 1-3/4

1-1/4, 1-1/2, 2

BMP 2832

1-3/4 2

1-1/4, 1-1/2, 2

BMP 3236

2 2-1/4

1-1/2, 2, 3

BMP 3240

2 2-1/2

1-1/2, 2, 3

BMP 4044

2-1/2 2-3/4

2, 2-1/2, 3

BMP 4048

2-1/2 3

2, 2-1/2, 3

BMP 4852

3 3-1/4

2, 2-1/2, 3

BMP 4856

3 3-1/2

2, 2-1/2, 3

BMP 5664

3-1/2 4

2, 4

BMP 6472

4 4-1/2

2, 4

BMP 8088

5 5-1/2

2, 4

Size not listed above may be quoted upon request

Recommended Size

0.5040
0.5020
0.6290
0.6270
0.7555
0.7525
0.8805
0.8775
1.0055
1.0025
1.1335
1.1305
1.2555
1.2525
1.3830
1.3790
1.5080
1.5040
1.7580
1.7540
2.0080
2.0040
2.0080
2.0040
2.5100
2.5060
2.5100
2.5060
3.0140
3.0100
3.0140
3.0100
3.5140
3.5100
4.0140
4.0100
5.0140
5.0100

0.7515
0.7505
0.8765
0.8755
1.0025
1.0005
1.1275
1.1255
1.2525
1.2505
1.3785
1.3765
1.5025
1.5005
1.6285
1.6265
1.7535
1.7515
2.0035
2.0015
2.2535
2.2515
2.5040
2.5020
2.7540
2.7520
3.0040
3.0020
3.2540
3.2520
3.5040
3.5020
4.0040
4.0020
4.5040
4.5020
5.5040
5.5020

Interference Fit
Housing

Shaft

0.7500
0.7495
0.8750
0.8745
1.0000
1.9995
1.1250
1.1245
1.2500
1.2495
1.3750
1.3745
1.5000
1.4995
1.6250
1.6245
1.7500
1.7495
2.0000
1.9995
2.2505
2.2495
2.5005
2.4995
2.7505
2.7495
3.0005
2.9990
3.2505
3.2490
3.5010
3.4990
4.0010
3.9990
4.5010
4.9990
5.5010
4.4990

0.4995
0.4985
0.6245
0.6235
0.7490
0.7485
0.8745
0.8735
0.9995
0.9985
1.1245
1.1235
1.2495
1.2485
1.3745
1.3735
1.4995
1.4990
1.7495
1.7480
1.9995
1.9980
1.9995
1.9980
2.4995
2.4975
2.4995
2.4975
2.9995
2.9975
2.9995
2.9975
3.4995
3.4965
3.9995
3.9965
4.9995
4.9960

0.0020
0.0005
0.0020
0.0005
0.0030
0.0005
0.0030
0.0005
0.0030
0.0005
0.0040
0.0015
0.0030
0.0005
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0040
0.0015
0.0045
0.0015
0.0045
0.0015
0.0050
0.0015
0.0050
0.0015
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010
0.0050
0.0010

Limited Warranty
For a period of 6 months from the date of first sale, Soltri Corporation warrants this product(s) to be
free defects in manufacturing. Our only obligation will be to provide replacement product for any
portion proving defective, or at our option, to refund the purchase price thereof. User assumes all
other risks, if any, including the risk of injury, loss or damage, whether direct or consequential, arising
out of the use, misuse, or inability to use this product(s). SOLTRI CORPORATION DISCLAIMS ANY
AND ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

NOTE
Soltri Corporation does not assume any responsibility or liability for any advice furnished by it, or for
the performance or results of any installation or use of the product(s) or of any final product into
which the product(s) may be incorporated by the purchaser and/or user. The purchaser and/or user
should perform its own tests to determine the suitability and fitness of the product(s) for the particular
purpose desired in any given situation.

18 / 19