Bolt Pretension Force Result Unit conversion

Now I want to get bolt pretension force result and want to convert the unit to N.
But using units module to get the force unit is 'tonne mm sec^-1 sec^-1', I am't not sure my conversion codes is right or not?

import units
analysis = Model.Analyses[0]
reader = analysis.GetResultsData()
BoltPreForece = reader.GetResult('BOLT')
# BoltPreForece.GetComponentInfo('LOAD').Unit
# 'tonne mm sec^-1 sec^-1'
BoltPreForeceUnit = BoltPreForece.GetComponentInfo('LOAD').Unit
BoltPreForceConve = units.ConvertUnit(1.0, BoltPreForeceUnit, 'N', 'Force')