Metric WMU® Plain Bearings

Part Number: WMU 280 285 100

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Details

Inner Diameter280
Outer Diameter285
Length100
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 Fitted280.07280.222-
Recommended Housing Size285285.052H7
Overall Length99.75100.25-
Shaft Diameter279.919280-
Inside Chamfers0.21-
Outside Chamfers1.22.4-

PV Calculation

ValuesMaximum
Speed
rpm
341 rpm
Load
kg
713557.6 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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