GGB DU Cylindrical bushes

DU® Metal-Polymer Anti-Friction Plain Bearings

CHARACTERISTICS

  • DU self-lubricating bushings offer very good wear and low friction performance over a wide range of loads, speeds and temperatures in dry running conditions
  • Suitable for lubricated applications
  • Suitable for linear, oscillating and rotating movements

availability

Bearing forms available in standard dimensions
  • Cylindrical bushes
  • Flanged bushes
  • Thrust washers
  • Flanged washers
  • Sliding plates
Bearing forms made to order: standard bushing forms in special dimensions, half-bushings, special shapes obtained by stamping or deep drawing, customized bushing designs

STRUCTURE AND COMPOSITION

  • Metal-Polymer Composite Self-lubricating Bushing Material
  • Steel Back + Porous Bronze Sinter +
  • PTFE + Lead

MICROSECTION

 

Sliding layer

PTFE + Lead

 

Porous Bronze Sinter

Steel Backing

OPERATING PERFORMANCE
Dry Very Good
Oil lubricated Good
Grease lubricated Fair
Water lubricated Fair
Process fluid lubricated Fair
For superior / LEAD-FREE performance
Dry DP4 / DP11
Oil lubricated DP4 / DP31
Grease lubricated DP4 / DX
Water lubricated DP4-B
Process fluid lubricated DP4 / DP31

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

Normal to the surface

10-6/K

 

10-6/K

11

 

30

Dry      
Maximum sliding speed, U   m/s

2.5

Maximum pU factor   N/mm2 x m/s 1.8
Coefficient of friction    

0.02 - 0.25 *

OIL LUBRICATED      
Maximum sliding speed, U   m/s

5.0

Maximum pU factor   N/mm2 x m/s

5.0

Coefficient of friction    

0.02 - 0.12

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 AND COMPOSITION

  • Metal-Polymer Composite Bushing Material
  • Steel Back + Porous Bronze Sinter +
  • PTFE + Lead

MICROSECTION

 

Sliding layer

PTFE + Lead

 

Porous Bronze Sinter

Steel Backing

OPERATING PERFORMANCE
Dry Very Good
Oil lubricated Good
Grease lubricated Fair
Water lubricated Fair
Process fluid lubricated Fair
FOR SUPERIOR / LEAD-FREE PERFORMANCE
Dry DP4 / DP11
Oil lubricated DP4 / DP31
Grease lubricated DP4 / DX
Water lubricated DP4-B
Process fluid lubricated DP4 / DP31

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

50 000

Coefficient of friction    

0.02 - 0.25 *

OIL LUBRICATED      
Maximum sliding speed, U   fpm

1 000

Maximum pU factor   psi x fpm

143 000

Coefficient of friction    

0.02 - 0.12

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

Part Finder

Part Finder

Search Now