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Mean diameter
d
m
mm
Lead
L
mm
Lead angle
λ
°
Angle
α
°
Normal angle
α
n
°
Friction coef.
μ
Force
F
N
Collar
Collar diameter
d
c
mm
Friction coef. Of collar
μ
c
Collar torque
T
C
N·m
Raising torque
T
R
N·m
Lowering torque
T
L
N·m
Efficiency
e