DP4 Antifriction plain bearing developed by GGB

GGB DP4 Cylindrical bushes

DP4® Metal-Polymer Low Friction Plain Bearings

CHARACTERISTICS

  • DP4 low friction bushings offer good wear and low friction performance over a wide range of loads, speeds and temperatures in dry running conditions
  • Very good performance in lubricated applications
  • Good performance in greased applications
  • Suitable for linear, oscillating and rotating movements
  • Lead-free material compliant to EVL, WEEE, and RoHS specifications
  • Approved to standard DIN EN 1797: 2002-02 and ISO 21010: 2004-04 (Cryogenic Vessels – Gas/Material Compatibility) for piping, valves, fittings and other components in both gaseous and liquid oxygen for up to maximum temperature of 60°C and oxygen pressure of 25 bars. Contact GGB for further details.
  • Approved to standard FAR 25.853 and FAR 25.855 - Federal Aviation Regulations – making it suitable for interior aircraft applications 

availability

Bearing forms available in standard dimensions
  • Cylindrical bushes
  • Flanged bushes
  • Sliding plates
  • Thrust washers
  • Flanged washers
Metric bearings and imperial bushings made to order: Standard bushing forms in special sizes, half-bushings, stamped/deep drawn shapes, bearings with locating notches, lubricant holes and grooves, customized designs

STRUCTURE & COMPOSITION

  • Metal-Polymer Composite Bushing Material
  • Steel back + Porous  Bronze Sinter +
  • PTFE + Fillers

MICROSECTION

Microsection of GGB DP4 plain bearings in metal-polymer composite material

Sliding layer

PTFE + Fillers

Porous Bronze Sinter

Steel Backing

OPERATING PERFORMANCE
Dry Good
Oil lubricated Very Good
Grease lubricated Good
Water lubricated Fair
Process fluid lubricated Good

 

For superior performance
Water lubricated DP4-B

 

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

N/mm2

N/mm2

250

140

Operating temperature

Min

Max

°C

°C

- 200

280

Coefficient of linear thermal expansion

Parallel to the surface

10-6/K

11

Normal to the surface 10-6/K 30
DRY      
Maximum sliding speed, U   m/s

2.5

Maximum pU factor  

N/mm2 x m/s

1.0

Coefficient of friction    

0.04 - 0.25 *

OIL LUBRICATED      
Maximum sliding speed, U   m/s

5.0

Maximum pU factor   N/mm2 x m/s

10.0

Coefficient of friction    

0.02 - 0.08

RECOMMENDATIONS      

Shaft surface roughness, Ra

Dry

Lubricated

µm

µm

0.3 - 0.5

0.05 - 0.4 *

Shaft surface hardness

Unhardened acceptable, improved bearing life > 200HB

 

* Depending on operating conditions

STRUCTURE & COMPOSITION

  • Metal-Polymer Composite Bushing Material
  • Steel back + Porous  Bronze Sinter +
  • PTFE + Fillers

MICROSECTION

Microsection of GGB DP4 plain bearings in metal-polymer composite material

Sliding layer

PTFE + Fillers

Porous Bronze Sinter

Steel Backing

OPERATING PERFORMANCE
Dry Good
Oil lubricated Very Good
Grease lubricated Good
Water lubricated Fair
Process fluid lubricated Good

 

FOR SUPERIOR PERFORMANCE
Water lubricated DP4-B

 

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

psi

psi

36 000

20 000

Operating temperature

Min

Max

°F

°F

- 328

536

Coefficient of linear thermal expansion

Parallel to the surface

10-6/F

6

Normal to the surface 10-6/F 17
DRY      
Maximum sliding speed, U   fpm

500

Maximum pU factor  

psi x fpm

29 000

Coefficient of friction    

0.04 - 0.25 *

OIL LUBRICATED      
Maximum sliding speed, U   fpm

1 000

Maximum pU factor   psi x fpm

286 000

Coefficient of friction    

0.02 - 0.08

RECOMMENDATIONS      

Shaft surface roughness, Ra

Dry

Lubricated

µin

µin

12 - 20

≤ 2 - 16 *

Shaft surface hardness

Unhardened acceptable, improved bearing life > 200HB

 

* Depending on operating conditions

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