engineered polymer bearings

GGB, an EnPro Industries, Inc. company

GGB Germany GmbH & Co. KGPostfach 18 62 . D-74008 Heilbronn

Ochsenbrunnenstraße 9 . D-74078 HeilbronnIndustriegebiet Böllinger Höfe

Tel. +49 (0)7131 269-0 . Fax +49 (0)7131 269-500eMail: [email protected] . www.ggbearings.com

EPEngineered Polymer Bearings

Designer´s Handbook

I

QualityAll the products described in this handbook are manufactured under DIN ISO 14001 or ISO/TS 16949 approved qualitymanagement systems.

II

Formula Symbols and Designations

FormulaSymbol Unit Designation

aB - Bearing size factor

aE - High load factor

aI - Intermittant operation factor

aM - Mating material factor

aQ - Speed/Load factor

aS - Surface finish factor

aT - Temperature application factor

aU - Rubbing speed factor

aW - Wear factor

B mm Nominal bush length

Bfl mm Nominal flange thickness

C 1/min Oscillating movement frequency

CD mm Installed diametral clearance

C0 mm OD chamfer length

Ci mm ID chamfer length

DH mm Housing Diameter

Di mm Nominal bush ID/nominal thrust washer ID

Di,a mm Bush ID when assembled inmiddle H7 housing

Do mm Nominal bush OD/nominal thrust washer OD

Dfl mm Flange diameter

DJ mm Shaft diameter

dD mm Dowel hole diameter

dP mm Pitch circle diameter for dowel hole

Et N/mm2 Elastic modulus in tension

F N Bearing load

f - Coefficient of friction

KW - Material wear constant

k1 - Heat dissipation factor

k2 - Heat dissipation factor

LH h Bearing service life

N 1/min Rotational speed

N 1/min Rotational speed for oscillating motion

p N/mm2 Specific load

psta,lim N/mm2 Maximum static load

pdyn,lim N/mm2 Maximum dynamic load

Ra mm Surface roughness (DIN 4768, ISO/DIN 4287/1)

s mm Bush wall thickness

T °C Temperature

Tamb °C Ambient temperature

toff s or min down time

ton s or min operating time

Ts,max °C Maximum temperature

Ts,min °C Minimum temperature

TM °C mean bearing temperature

TS °C Sliding surface temperature

∆T - Temperature difference

U m/s Sliding speed

Ulim m/s Maximum sliding speed

α1 1/106K Coefficient of linear thermal expansion

σc N/mm2 Compressive Yield strength

σf N/mm2 Bending strength

σt N/mm2 Tensile strength

∆sa - Permissible radial wear (0.2 mm)

∆sh - Rubbing wear rate

τ - Application correction exponent

λ W/mK Thermal conductivity

λB W/mK Thermal conductivity of bearing material

λJ W/mK Thermal conductivity of shaft material

ϕ ° Angular displacement

Θ - amplitude either side of a mean position

η Ns/mm2 Dynamic Viscosity

ZT - Total number of osscillating movements

FormulaSymbol Unit Designation

3

Content

ContentQuality . . . . . . . . . . . . . . . . . . . . . IFormula Symbolsand Designations . . . . . . . . . . . . . II

1 Introduction . . . . . . . . . . . 41.1 Characteristics

and Advantages . . . . . . . . . . . . . 4

2 Materials . . . . . . . . . . . . . . 42.1 Standard Stock Products . . . . . 4

EP . . . . . . . . . . . . . . . . . . . . . . . . 4Basic Forms . . . . . . . . . . . . . . . . . 5

3 Compositionand Structure . . . . . . . . . . 6EP . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Chemical Resistance . . . 7

5 Material Properties . . . . . 8

6 Wear and life calculationsunder dry runningconditions . . . . . . . . . . . . 9Effect of specific bearing load p . 10Effect of sliding speed . . . . . . . . 10Effect of surface finish . . . . . . . . 11

Effect of bearing diameter . . . . . 11Effect of intermittent operation . . 12Effect of specific load p andsliding surface temperature . . . . 12Correction factor for mating material aM . . . . . . . . . . . 13Correction factors for heatdissipation qualities of bearing design . . . . . . . . . . . . . . 13Thermal conductivity of mating surfaces λJ . . . . . . . . . . . 13Sliding friction coefficient for lubricated applications . . . . . 13Calculation Procedure . . . . . . . . 14Worked Example . . . . . . . . . . . . 15

7 Bearing Design . . . . . . . 16Housings . . . . . . . . . . . . . . . . . . 16Journals . . . . . . . . . . . . . . . . . . . 16Bearing Clearance . . . . . . . . . . . 16Installation . . . . . . . . . . . . . . . . . 16Machining . . . . . . . . . . . . . . . . . . 16

8 Product Size Tables . . . 178.1 EP Cylindrical bushes . . . . . . . 178.2 EP Flanged bushes . . . . . . . . . 19

9 Technical Data Sheet . . 20

1 Introduction

4

1 IntroductionThe purpose of this handbook is to providecomprehensive technical information onthe characteristics of GGB maintenance-free, self-lubricating, injection mouldedthermoplastic bearing materials. The infor-mation given permits designers to estab-lish the appropriate material required for aparticular application. GGB applicationsand development services are available toassist with unusual design problems.

GGB is continually refining and extendingits experimental and theoretical knowledgeand, therefore, when using this brochure itis always worthwhile to contact the Com-pany should additional information berequired. As it is impossible to cover all conditions ofoperation which arise in practice, custom-ers are advised to carry out prototype test-ing wherever possible.

1.1 Characteristics and AdvantagesEP offers the following advantages:• Maintenance free operation• No external lubrication required• Seizure resistant• Good frictional properties

• Corrosion resistant• Compact assembly• Simple installation• Low noise

2 MaterialsGGB thermoplastic injection mouldedbearings are complementary to GGB’smaintenance free metal-polymer bearing

materials for dry and pre-lubricated appli-cations.

2.1 Standard Stock Products EPEP is a homogeneous composite materialbased on an aromatic polyamide with solidlubricant polytetrafluorothylene (PTFE)and glass fibre fillers specially formulatedto provide excellent wear resistance andlow friction over a wide range of light dutyoperating conditions.

EP bearings are self lubricating and main-tenance free with excellent dimensionalstability, low coefficient of friction, highcompressive strength and creep resist-ance, low thermal expansion and goodthermal conductivity.

2Materials

Basic FormsEP materials are available from stock asstandard components, manufactured to

standard dimensions in the followingforms:

Metric Sizes• Cylindrical Bushes• Flanged BushesThese standard dimensions are designedsuch that EP is directly interchangeable

with the standard range of DU metal-poly-mer bearings.For more severe duty application referenceshould be made to the DU/DU-B Dry Bear-ings Designers’ Handbook.

Fig. 1: Standard Components

Non Standard Components not available from stockThese products can also be manufacturedto customers‘ requirements with or withoutGGB recommendations, including forexample:• Modified standard components

• Spherical bearings and components• Thrust washers• Complex components suitable for manu-

facture by injection moulding

Fig. 2: Non Standard Components

Thermoplastic Injection Moulded Materials not available from stockAlso available from GGB is an extensiverange of alternative injection moulded ther-moplastic bearing materials formulated tomeet specific application requirements.These materials are not available fromstock but can be manufactured to thesame dimensions as the standard stockmaterial ranges of cylindrical and flangedbushes in addition to special componentsto customer’s requirements.GGB are able to supply multi-layer injec-tion moulded bearing components in which

different materials are used for the slidingand supporting layers. The properties ofeach material can thus be optimised tomeet the tribological and structural require-ments of the application. For applicationswhere the bearing is greased on assemblyit is possible to provide a bearing surfacewith a uniform moulded pattern of indents,which thus act as a grease reservoir.GGB are also able to supply injectionmoulded bearings complete with integralsealing elements.

5

3 Composition and Structure

6

The materials available include the following:

Table 1: Other Thermoplastic Bearing Materials

ApplicationsGGB injection moulded thermoplasticbearings are suitable for rotating, oscillat-ing, reciprocating and sliding movements,and typical applications include: • Domestic appliances• Office equipment• Automotive components• Valves

• Presses• Electric motors • Machine tools• Mechanical handling equipment• Printing machines• Food and pharmaceutical handling

equipment

3 Composition and StructureEPEP is a polyamide resin containing botharomatic and aliphatic elements with theaddition of solid lubricant and glass fibrefillers formulated to provide the optimumcombination of physical and mechanicalproperties and bearing performance.EP, as for all the injection moulded bearingmaterials described here, has a homoge-neous structure and hence the wear per-formance is uniform throughout. Theallowable wear is limited only by the bear-ing wall thickness and the mechanical con-straints of the application.

Fig. 3: EP Microstructure

MaterialGrade Polymer Fillers Comments

Torlon 4203 Poly(amide-imide) (PAI)

PTFE +TiO2High strength material, good che-mical resistance.

Torlon 4301 Poly(amide-imide) (PAI) graphite + PTFE Good for dry applications at eleva-

ted temperatures.

4Chemical Resistance

4 Chemical Resistance

Table 2: Chemical Properties

ChemicalConcen-tration

[%]

Tempe-rature[°C]

Rating

EP Torlon4203

Torlon4301

Strong Acids

Hydrochloric Acid 5 23 - + +

Nitric Acid 5 23 - + +

Sulphuric Acid 5 23 - + +

Weak Acids

Acetic Acid 5 23 - + +

Formic Acid 5 23 - + +

Bases

Ammonia 10 23 + - -

Sodium Hydroxide 5 23 + - +

Solvents

Acetone 23 + + na

Carbon Tetrachloride 23 + + +

Lubricants and fuels

Paraffin 23 + + +

Gasolene 23 + + +

Kerosene 23 + + +

Diesel fuel 23 + + +

Mineral Oil 70 + + +

HFA-ISO46High Water fluid 70 + + +

HFC-Water-Glycol 70 + + +

HFD-Phosphate Ester 70 na + +

Water 20 + + +

Sea Water 20 + + +

+ Satisfactory: Damage is unlikely to occur.

-Unsatisfactory: Damage will occur and is likely to affect either the structural integrity and/or the tribological performance of the material.

na Not Available:This information is not available.

7

5 Material Properties

8

5 Material Properties

Table 3: Physical, Mechanical and Bearing Properties

Material Type EP TORLON 4203 TORLON 4301

BASIC POLYMER+ Fillers

PA6.6T + GF

+ PTFE+ Graphite

PAI+ TIO2+ PTFE

PAI+ Graphite

+ PTFE

PHYSICAL PROPERTIESColour black yellow brown dark brown

Thermal conductivity λB [W/mK]

0.40 0.26 0.54

Coeff. of linear thermal expansion α1 [10-5/k] 2.2 3.1 2.5

Density [g/cm3] 1.52 1.38 1.45

Water absorption [%]Water vapour[50 % rH/24h] 0.26 0.33 0.2

MECHANICAL PROPERTIESTensile strength σt

[N/mm²]100 190 160

Modulus of elasticity in tension Et [N/mm²] 11000 5000 6600

BEARING PROPERTIESMaterial Wear Constant

KW1 6.25 1

Max. specific loadpstat max [N/mm²] 80 200 150

Max. sliding speedUlim [m/s]

Dry, rotating 1 2.5 2.5Dry, sliding 3 5 5

Max. pU [N/mm² x m/s]- dry 1.0 4.0 4.0

Min./max. sliding surface temperature Ts lim [°C]

-40+140

-200+260

-200+260

Unloaded, short-time max. temperature +240 +260 +260

Dynamic coefficientof friction f

Dry against steel 0.15 - 0.25 0.10 - 0.20 0.08 - 0.15lubricated 0.04 - 0.12

6Wear and life calculations

6 Wear and life calculations under dry running conditions

Because the operating conditions of abearing can rarely be defined with absoluteprecision it is difficult to forecast wear ratesexactly. However the following formulae,

diagrams and tables will enable a usefulapproximations of the total wear rate ∆sh

and life LH to be calculated.

Description Formula symbol Unit Value

Internal diameter Di [mm]

Outer diameter Do [mm]

Bush width B [mm]

Wall thickness s [mm]

Bearing load F [N]

Rotational speed N [1/min]

Average Rotational speed for oscillating motion

N [1/min]

where Θ = amplitude either side of a mean posi-tion [°]

and C = frequency in cycles per minute [1/min]

Ambient temperature Tamb [°C]

Maximum specific load (Table 3) p [N/mm2]

Maximum sliding velocity (Table 3) Ulim [m/s]

Coefficient of friction Dry (Fig. 4) f [-]

Correction factor for rubbing speed (Fig. 5) aU [-]

Correction factor for mating material (Table 4) aM [-]

Correction factor for surface finish (Fig. 6) aS [-]

Correction factor for bearing size (Fig. 7) aB [-]

Correction factors for heat dissipation qualities of bearing design (Table 5)

k1, k2

Thermal conductivity

Bearing material (Table 3) λB [W/mk]

Shaft material (Table 6) λJ [W/mk]

Correction factor for intermittant operation (Fig. 8) ai [-]

Wear factor (Fig. 9) aW [-]

Material Wear Constant (Table 3) KW [-]

N 4 Θ C⋅ ⋅360

---------------------=

9

6 Wear and life calculations

10

Effect of specific bearing load pThe coefficient of friction depends uponthe specific load p and the surface rough-ness of the mating surface. Fig. 4 shows

the relationship between the specific loadand the coefficient of friction for matingsurface roughness of Ra = 0.4-0.8 µm.

Fig. 4: Friction coefficient f vs specific load p

Effect of sliding speedThe wear rate increases with sliding speedunder constant pU conditions. Fig. 5

shows the relationship between rubbingspeed factor aU and sliding speed U.

Fig. 5: Correction factor for sliding speed aU as function of rubbing speed U

Specific load p

00

0.5 0.75 1.0

0.1

0.3

0.2

0.25

Maximum specific load pstat,lim (Table 3, Page 8)

Fric

tion

coef

ficie

nt f

EPTorlon 4203/4301

Torlon 4301

00

0.5 0.75 1.0

2

6

4

0.25

Sliding speed UMaximum sliding speed

Cor

rect

ion

fact

or fo

r rub

bing

spe

ed a

U

3

1

5


Effect of surface finishThe finish of the mating surface signifi-cantly affects the bush wear rate. Both

excessively fine and coarse finishes canproduce heavy wear.

Fig. 6: Correction factor for surface finish aS

Effect of bearing diameterThe temperature rise due to frictional heat-ing is dependent upon the bearing diame-ter. Fig. 7 shows the relationship between

the bearing size correction factor aB andthe bearing diameter Di.

Fig. 7: Correction factor for bearing size aB

0.050

0.2 1.0 2.0

1

3

2

0.1

Average peak-to-valley height Ra [µm]

Cor

rect

ion

fact

or fo

r sur

face

fini

sh a

s

0.5

1.1

1.21.31.41.51.61.71.81.9

2.2

2.4

2.62.7

2.5

2.3

2.1

EPTorlon 4301

Torlon 4203

20

4 30 60

2.0

1.0

3

Bearing bore Di [mm]

Cor

rect

ion

fact

or fo

r bea

ring

size

aB

20

0.1

0.2

0.3

0.4

0.50.60.70.80.9

1.21.41.61.51.31.1

5 6 7 8 910 40 50

11


12

Effect of intermittent operationThe temperature rise due to frictional heat-ing is generally lower for a bearing operat-ing intermittently than one operatingcontinuously under the same pU condi-tions.Fig. 8 shows the relationship between theintermittent operation correction factor aiand the operating cycle ratio toff/ton.

For example:down time toff = 40 secoperating time ton = 20 secoperating cycle ratio = 40/20 = 2For 20 seconds operation the correctionfactor aI = 2.7 can be read off curve 2.

Fig. 8: Correction factor for intermittent operation aI as function of load duration

Effect of specific load p and sliding surface temperatureThe wear rate depends upon the specificload p and the sliding surface temperatureTs. Fig. 9 shows the relationship between

wear rate correction factor aW, specificload p and sliding surface temperature Ts.

Fig. 9: Wear factor aW as function of specific load p and sliding surface temperature Ts

00

2 30 9

16

10

1

Operating period ton

Cor

rect

ion

fact

or fo

r int

erm

itten

t ope

ratio

n a I

20

2

4

6

8

12

3 4 6 810 750 1 2 3 54

14

seconds minutes

1

2

3

4

down timeoperating time

toffton

=

00

0.6 0.8 1.0

0.4

0.8

0.2

Sliding surface temperature TsMaximum temperature Ts,max

0.6

0.2

1.0

0.4

aw=

2

5

10

20

Spe

cific

load

pM

axim

um s

peci

fic lo

ad p

stat

,lim


Correction factor for mating material aM

Table 4: Correction factor for mating material aM

Correction factors for heat dissipation qualities of bearing design

Table 5: Correction factors for heat dissipation qualities of bearing design

Thermal conductivity of mating surfaces λJ

Table 6: Thermal conductivity of mating surfaces λJ

Sliding friction coefficient for lubricated applications

Table 7: Sliding friction coefficient for lubricated applications

Material Correction factor aM

Iron 2.5

Other materials are cur-rently being tested!

Carbon steel 1

Alloy steel 1

Stainless steel 0.8

Bush wall thickness s3 [mm]Correction factors

k1 k2

2 0.5 0.042 k1 and k2 are factors, which take into account how heat dissipation is

affected by bearing design>2 0.75 0.058

Material Thermal conductivity λJ [W/mK]

Cast iron 60

Carbon steel 46

Low alloy steel 55

Stainless steel 14.5

Aluminium alloy 150

Bronze 46

Phosphor bronze 75

Brass 80

Aluminium bronze 120

Type of lubrication Sliding friction coefficient

Initial grease lubrication 0.12 Mixed lubrication is present when:

in which:η = dynamic viscosity in cP

V = bearing volume

Grease reservoir 0.09

Oil mist 0.09

Water lubrication (mixed lubrication) 0.04

Oil lubrication

0.04

NtrF 105⋅η V⋅

----------------- min 1–[ ]<

VDi

2 π B⋅ ⋅4

------------------------= mm3[ ]

13


14

1. Specific bearing load p

2. Sliding speed U [m/s]

or

3. pU Value [N/mm² x m/s]

4. Temperature rise ∆T [°C

where τ is the correctioτ = 1.4 for rotational moτ = 1.3 for oscillating mτ = 1.2 for oscillating mτ = 1.0, amplitude Θ < 1in which

and ai = 1 for continuou

5. Mean bearing temperat

6. Sliding surface tempera

7. Wear rate ∆sh [µm/h]

8. Life LH [h]

with ∆sa as permissible(for which 0.2 mm can b

9. The above calculations

Flanged bushes

where Dfl = Flange diam

Thrust washers

where Do = Thrust wash

p FDi B⋅--------------=

UDi π N⋅ ⋅60000

----------------------=

UDi π N⋅ ⋅60000

----------------------=

p U⋅

T∆pU( )τ 1000 f a⋅ ⋅ ⋅

π AB AJ+( ) aB⋅ ⋅ ⋅-----------------------------------------------=

ABλB k1⋅

sB----------------= and

TM T∆ Tamb+=

TS Tamb 1 15⋅TM17------+⎝

⎛+=

sh∆ p U KW aW a⋅ ⋅ ⋅ ⋅=

LHsa∆ 103⋅

sh∆-----------------------=

Di12--- Dfl Di+( )⋅=

Di12--- Do Di+( )⋅=

Calculation ProcedureEquations Calculations

[N/mm²]

]

n exponent for the following conditionsvementovement, amplitude Θ > 22.5°ovement, amplitude 12.5° ≤ Θ ≤ 22.5°2.5°

s operation (for intermittant operation see Fig. 8)

ure TM[°C]

ture Ts [°C] (Ts,max = 140 °C)

radial wear in mme assumed for normal applications)

are modified as follows:

eter and Di = Internal diameter

er OD and Di = Thrust washer ID

Sai----- 1

2 5⋅--------⋅

AJλJ k2⋅2 B⋅

----------------=

0----⎠

⎞ T∆⋅

U aM a⋅ S⋅

B π2--- Dfl Di–( )⋅=and

B π2--- Do Di–( )⋅=and


Given:

unlubricated

Bush 2015 EP

Bush ID Di 20 mm

Bush OD D0 23 mm

Wallthickness

sB 1.5 mm

Bush length B 15 mm

Bearing load F 40 N

Rotational speed

N 750 1/min

Ambienttemperature

Tamb 20 °C

Shaft material

Steel HRC 50

Surface finish Ra 0.6 µm

Establish: whether proposed bearing size is adequate, expec-ted life of bearing and appro-priate bearing clearance

Worked ExampleCalculation

ResultShould the calculated life of 397 hours beinsufficient, increase the bearing lengthand/or diameter.

The sliding surface temperature is <80 °C,so no increase in bearing clearance is nec-essary (see section 7).

Equations Results

1. Specific bearing load p [N/mm²]0.133 N/mm²

2. Sliding speed U [m/s]0.785 m/s

3. pU Value [N/mm² x m/s]0.105W/mm²

4. Temperature rise ∆T [°C], in which:τ = 1.4 for rotational movementf = 0.3 from Fig. 4aS = 1 from Fig. 6aB = 0.5 from Fig. 7ai = 1 for continuous operation k1 = 0.5 from Table 5k2 = 0.042 from Table 5λJ = 46 from Table 6, λB = 40 from Table 6

0.133

0.064

16.407 °C

5. Mean bearing temperature TM [°C]36.41 °C

6. Sliding surface temperature Ts [°C] (TS lim = 140 °C)42.38 °C

7. Wear rate ∆sh [µm/h], in whichaW = from Fig. 9aU = from Fig. 5aM = from Table 4aS = from Fig. 6KW = from Table 3

0.504 µm/h

8. Life LH [h]in which ∆sa = 0.2 mm

397 h

p FDi B⋅-------------- 40

20 15⋅-----------------==

UDi π N⋅ ⋅60000

---------------------- 20 π 750⋅ ⋅60000

-----------------------------==

p U 0 133⋅ 0 785⋅⋅=⋅

ABλB k1⋅

sB---------------- 0 40⋅ 0 5⋅⋅

1 5⋅------------------------------==

AJλJ k2⋅2 B⋅

---------------- 46 0 042⋅⋅2 15⋅

--------------------------==

T∆pU( )τ 1000 f aS⋅ ⋅ ⋅

π AB AJ+( ) aB ai⋅ ⋅ ⋅---------------------------------------------------- 1

2 5⋅-------- 0 105⋅( ) 1 4⋅ 1000 0 3⋅ 1⋅ ⋅ ⋅

π 0 133⋅ 0 064⋅+( ) 0 5⋅ 1⋅ ⋅ ⋅------------------------------------------------------------------------------ 1

2 5⋅--------⋅=⋅=

TM T∆ Tamb 16 41⋅ 20+=+=

TS Tamb 1 15⋅Tm170----------+⎝ ⎠

⎛ ⎞ T 20 1 15⋅ 36 41⋅170

-----------------+⎝ ⎠⎛ ⎞ 16 407⋅⋅+=∆⋅+=

sh∆ p U KW aW aU aM aS 0 105⋅ 1 1 48⋅ 1 1⋅ ⋅ ⋅ ⋅=⋅ ⋅ ⋅ ⋅ ⋅ ⋅=

LHsa∆ 103⋅

sh∆----------------------- 0 2, 1000⋅

0 504⋅---------------------------== .

15

7 Bearing Design

16

7 Bearing DesignHousingsGGB injection moulded bearings are man-ufactured suitable for press fitting intohousings machined to H7 tolerance. Thepress fit interference is 0.5-1.5 % depend-ing upon the diameter.For GGB injection moulded thermoplasticbearings the interference is maintained at

temperatures between -40 °C and themaximum temperature, although somereduction in the press-fit force will occur attemperatures above 100 °C.The bore of installed bushes will generallylie within the following tolerance range: EPbushes D11-D12.

JournalsJournals finished to h7 tolerance are pre-ferred. For EP and MF bearings optimumwear performance is obtained with a jour-nal surface finish ground to Ra 0.4-0.8 µm.

A minimum shaft hardness of HRC 50 isrecommended.

Bearing ClearanceThe bearing clearance is designed forbush operating temperatures in the range -10 °C to +80 °C. Attention should be paidto the effect of thermal expansion. Where

the normal operating temperature is above80 °C, the clearance should be increasedby about 0.15 o/oo per 10 °C increment.

InstallationA GGB injection moulded bearing shouldbe assembled into its housing with the aidof a stepped mandrel, preferably madefrom case-hardened mild steel.To assist assembly a lead-in chamfershould be machined according to Fig. 10.

The bush, mandrel and housing must becorrectly aligned during assembly.Recommended mandrel and chamferdimensions are given in Fig. 10.

Fig. 10: Fitting instructions for bushes and flanged bushes

MachiningGGB injection moulded bushes can bemachined with conventional tools at nor-mal speeds.For materials containing glass fibres, suchas EP, machining of the running surfaces is

not recommended due to the increasedexposure of glass fibre to the bearing sur-face which may result in excessive wear ofthe mating surface.

45°

DH+ 2 C

DiDo

Dfl + 1

Di - 0,2

Break sharp edge

C

R

Di - 0.2

B -1

Chamfer C

DH C

≤12 0.8

>12 ≤65 1.2

>65 2.3

DH DH

C45

°

8Product Size Tables

Rz 16

Di

s Co R1 max1.0 0.5 0.1

1.5 - 2 0.8 0.2

Recommended Shaft Tolerance h7

8 Product Size Tables8.1 EP Cylindrical bushes

All dimensions in mm

IT 10

_

30˚Co

R1m

ax R1m

ax

Do

ZB h13

s

Detail Z

Cav

ity N

umbe

r

Part No.

Dimensions [mm]

Weight[g]

Installed tolerance [H7]

ID-∅Di

OD-∅Do

WidthB

Housing-∅DH [H7]

Bush bore Di,a after ass. in middle H7 housing

0505 EP5 7

5 0.14

+0.0150

+0.105+0.030

0508 EP 8 0.220510 EP 10 0.280606 EP

6 86 0.20

0608 EP 8 0.260610 EP 10 0.330806 EP

8 10

6 0.25

+0.130+0.040

0808 EP 8 0.340810 EP 10 0.420812 EP 12 0.500815 EP 15 0.631004 EP

10 12

4 0.20

+0.0180

1006 EP 6 0.311008 EP 8 0.411010 EP 10 0.511015 EP 15 0.771020 EP 20 1.021210 EP

12 14

10 0.60

+0.160+0.050

1212 EP 12 0.731215 EP 15 0.911220 EP 20 1.211415 EP

14 16

15 1.051420 EP 20 1.401425 EP 25 1.741515 EP

15 1715 1.12

1520 EP 20 1.491525 EP 25 1.86

17

18

8 Product Size Tables

2015 EP20 23

15 2.25

+0.0210

+0.195+0.065

2020 EP 20 3.002030 EP 30 4.502515 EP

25 2815 2.77

2520 EP 20 3.702530 EP 30 5.553020 EP

30 3420 5.95

+0.0250

+0.240+0.0803030 EP 30 8.93

3040 EP 40 11.90

Part No.

Dimensions [mm]

Weight[g]


ID-∅Di

OD-∅Do

WidthB

Housing-∅DH [H7]

Bush bore Di,a after ass. in middle H7 housing

8Product Size Tables

) 100

s Co R1 max1.0 0.5 0.1

1.5 - 2 0.8 0.2

s R (mm)≤1 0.3>1 0.5

ecommended Shaft Tolerance h7

8.2 EP Flanged bushes

All dimensions in mm

_

Rz 16 ( Rz

Rz 100

IT 10

Bflh13

30˚

ZCo

A

R1m

ax

IT 9

R

A

A

B h13

s

Do

Dfl

h13

Di

Detail ZC

avity

Num

ber

R

Part No.

Dimensions [mm]Flange Thick-ness

Bfl

Weight[g]


ID-∅Di

OD-∅Do

Flange-∅Dfl

WidthB

Housing-∅DH [H7]

Bush bore Di,a after ass. in

middle H7 housing

BB 0505 EP 5 7 11 5 1 0.22

+0.0150

+0.105+0.030

BB 0604 EP

6 8 12

4

1

0.22BB 0606 EP 6 0.29BB 0608 EP 8 0.35BB 0610 EP 10 0.42BB 0806 EP

8 10 156

10.38

+0.130+0.040

BB 0808 EP 8 0.46BB 0810 EP 10 0.54BB 1007 EP

10 12 18

7

1

0.57

+0.0180

BB 1009 EP 9 0.57BB 1012 EP 12 0.82BB 1015 EP 15 0.97BB 1017 EP 17 1.08BB 1207 EP

12 14 20

7

1

0.66

+0.160+0.050

BB 1209 EP 9 0.78BB 1212 EP 12 0.96BB 1215 EP 15 1.15BB 1217 EP 17 1.27BB 1220 EP 20 1.46BB 1412 EP

14 16 2212

11.10

BB 1417 EP 17 1.45BB 1509 EP

15 17 23

9

1

0.95BB 1512 EP 12 1.17BB 1517 EP 17 1.54BB 1520 EP 20 1.76BB 1617 EP 16 18 24 17 1 1.70BB 2012 EP

20 23 3012

1.52.37

+0.0210

+0.195+0.065

BB 2017 EP 17 3.12BB 2022 EP 22 3.87BB 2512 EP

25 28 3512

1.52.89

BB 2517 EP 17 3.82BB 2522 EP 22 4.74

19

20

9 Technical Data Sheet

Quantity

Dimensions in mm

Inside Diameter

Width Outside Diameter

Flange DiameterFlange ThicknessLength of slideplateWidth of slideplate Thickness of slideplate

Radial load F or specific load p [N/mm

Axial load F or specific load p [N/mm

Oscillating frequency Nosz [1/m

Rotational speed N [1/mSpeed U [mLength of Stroke LS [mFrequency of Stroke [1/m

Oscillating cycle ϕ

Continuous operation

Load

Service hours per day

Days per yearOperating timeIntermittent operation

Movement

Rotational movement Ste

Cylindrical Bush Fla

Existing Design

B

Di

Do

Customer DataCompany:Street:

CP

9 Technical Data SheetApplication:

Di

BDo

Dfl

Bfl

LWsS

[N]²]

[N]²]

in]

in]/s]m]in]

[°]

Shaft DJ

Bearing Housing DH

Fits and Tolerances

Ambient temperature Tamb [°]

Operating Environment

Non metal housing with poor heat transfer properties

Light pressing or insulated housing with poor heat transfer properties

Housing with good heat transferproperties

Material

Mating surface

Surface finish Ra [µm]Hardness HB/HRC

Process FluidLubricant

Alternate operation in water and dry

Dry

Lubrication

Process fluid lubrication

Continuous lubrication

Initial lubrication only

Hydrodynamic conditions

Dynamic viscosity η

Required service life LH [h]

Service life

ady load Rotating load Oscillating movement

nged Bush Thrust Washer Slideplate

New Design

Special(Sketch)

Linear movementD

i

Dfl

DiDo D0

Ws S

BBfl sT

L

Project:Name:Tel.:

Date:Signature:Fax:

ity:ost Code:

©2007 GGB. All rights reserved.www.ggbearings.com

This handbook was designed by Profidoc Silvia Freitag

www.profidoc.de

06-07

GGB warrants that products described in this brochure are free from defects in workmanship and material but unless expressly agreed in wri-ting GGB gives no warranty that these products are suitable for any par-ticular purpose of for use under any specific conditions notwithstanding that such purpose would appear to be covered by this publication. GGB accepts no liability for any loss, damage, or expense whatsoever arising directly or indirectly from use of its products. All business undertaken by GGB is subject to its standard Conditions of Sale, copies of which are available upon request. GGB products are subject to continual develop-ment and GGB reserves the right to make changes in the specification and design of its products without prior notice.

GGBTM is a trademark of GGB.

EPTM is a trademark of GGB.

Torlon© is a registered trademark of Solvay Advanced Polymers, LLC, USA.

Declaration on the RoHS Directive

On 1 July 2006, the EU directive 2002/95/EC (“RoHS-directive,Restriction of Hazardous Substances”) became effective. It forbids placing products into circulation that contain lead, cadmium, chromium (VI), mercury or PBB/PBDE-containing flame retardants.All GGB products, except DU and DUB, comply with the EU directives 2002/96/EG (End of Life directive for electric and electronic devices) and 2002/95/EG (constraint of certain hazardous materials in electric and electronic devices).As an environmentally conscious company, GGB worked within itsguidelines on a conversion to environmentally friendly materials.Today, the entire product range is lead-free.

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www.ggbearings.com

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