Metric WMU® Plain Bearings

Part Number: WMU 50 55 40

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Details

Inner Diameter50
Outer Diameter55
Length40
Backing MaterialStandard Steel

Material Specification

StructureS.A.E. 1010 steel backing strip with sintered bronze and PTFE layers
Max PV – Dry (N/mm² x m/s)1.8
Max PV – Oiled (N/mm² x m/s)2.8
Max Static load (N/mm²)250
Max Dynamic load (N/mm²)140
Max Sliding speed – Dry (m/s)2.5
Max Sliding speed – With Oil (m/s)5
Operating temperature (°C)-200 to 280
Thermal Conductivity (W/mk)42
Coefficient of friction – Dry0.02 to 0.20
Coefficient of friction – With Oil0.02 to 0.15
Recommended shaft finish (Ra)0.04 max (N5)
Recommended shaft hardness (HB)200 min

Tolerances & Fittings (Metric)

MinMaxTolerance
Inside Diameter When Fitted49.9950.105
Recommended Housing Size5555.03H7
Overall Length39.7540.25
Shaft Diameter49.9549.975
Inside Chamfers0.21
Outside Chamfers1.22.4

PV Calculation

ValuesMaximum
Speed
rpm
1909.859 rpm
Load
kg
50968.4 kg
PV Factor
N/A
N/mm² x m/s
1.8 N/mm² x m/s

⚠ Maximum PV Factor is 1.8! Reduce speed or load.

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