Imperial WMU® Plain Bearings

Part Number: WMUI 04 05 06

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Details

Inner Diameter0.25
Outer Diameter0.3125
Length0.375
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 (Imperial)

MinMaxTolerance
Inside Diameter When Fitted0.24920.2518
Recommended Housing Size0.31220.3128
Overall Length0.3650.385
Shaft Diameter0.24810.249

PV Calculation

ValuesMaximum
Speed
rpm
381971.863 rpm
Load
kg
2.389 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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