Prevailing Torque Lock Nut Values - Metric - Self Locking Nuts & Industrial Nuts

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Prevailing Torque Lock Nut Values - Metric

Technical Information

All Metal Prevailing Torque Lock Nuts Performance Properties - Prevailing Torque Nm

Thread

Property Class 5,8

Property Class 10,12

Size

Pitch

First Installation Max

First Removal Min

Fith Removal Min

First Installation Max

First Removal Min

Fith Removal Min

M4

0.7

0.9

0.18

0.12

1.2

0.22

0.15

M5

0.8

1.6

0.29

0.2

2.1

0.35

0.24

M6

1

3.0

0.45

0.3

4

0.55

0.4

M8

1.25

6.0

0.85

0.6

8

1.15

0.8

M10

1.5

10.5

1.5

1

14

2

1.4

M12

1.75

15.5

2.3

1.6

21

3.1

2.1

M14

2.0

24

3.3

2.3

31

4.4

3

M16

2.0

32

4.5

3

42

6

4.2

M18

2.5

42

6

4.2

56

8

5.5

M20

2.5

54

7.5

5.3

72

10.5

7

M24

3.0

80

11.5

8

106

15

10.5

Torque Values and Friction Coefficient - All Metal Self Locking Nuts - Where Torque tightening equipment is used, account should be taken of the additional torque required to overcome the resistance of the prevailing torque locking nut. As a general guide, during initial experiments to determine the specific torque settings required to achieve the desired clamp load, the torque value should be increased by the “first removal minimum” value shown above.
All Metal Self Locking Nuts are usually supplied Zinc plated and passivated with anti seize wax. This reduces the Zinc plated friction coefficient and assists in maintaining consistent torque values. Alternative coatings will produce different friction coefficient values which must be considered when torque tightening equipment is used.  

Typical K values:
Waxed (e.g. pressure wax as supplied on prevailing torque and high strength nuts) = .10 - .125
Zinc Plated = .25 - .30
Plain non-plated = .20 - .25

 
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