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02Jul

Introduction to Torque Part 5

Torque Conversion Factors

The below formulas and information provide guidance on different conversion factors e.g. the effect of torque wrench extensions.

 

Units to be converted

S.I. Units

Imperial Units

Metric Units

cN·m

N·m

ozf·in

lbf·in

lbf·ft

Kgf·cm

Kgf·m

1 cN·m =

1

0.01

1.416

0.088

0.007

0.102

0.001

1 N·m =

100

1

141.6

8.851

0.738

10.20

0.102

1 ozf·in =

0.706

0.007

1

0.0625

0.005

0.072

0.0007

1 lbf·in =

11.3

0.113

16

1

0.083

1.152

0.0115

1 lbf·ft =

135.6

1.356

192

12

1

13.83

0.138

1 kgf·cm =

9.807

0.098

13.89

0.868

0.072

1

0.001

1 kgf·m =

980.7

9.807

1389

86.8

7.233

100

1

 

 

 

 

 

 

 

 

Formulae

Accepted formulae relating torque and tension, based on many tests are: -

For Imperial Sizes

These formulae may be used for bolts outside the range of the tables.

Formula for Calculating the Effect of Torque Wrench Extensions

M1 = M2 x L1/L2

Where L1 is the normal length and L2 is the extended length, M1 is the set torque and M2 the actual torque applied to the nut.

Example

The required torque on the fastener is 130 N·m (M2) but what do you set on the torque wrench scale?
 
L1 = 500 L2 = 650
 
(units of length not important, this is ratio)
 
M1 = 130 x 500/650
 
M1 = 100

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Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas:

  1. Unit conversion to assist international measurement definitions.
  2. Torque extension for setting correct values
  3. Torque tension to identify precise levels of torque to be applied for individual applications.

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