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DIN 980 Hexagonal Locking Nut Grade 4.8-12.9 - China Suppliers & Factory for Reliable Bolt Connections
Product introduction introduction
There are threaded holes drilled through the outer surface of the nut to the inner threaded surface (usually 2, distributed 90 degrees on the outer surface), which are used to screw in small diameter countersunk screws. The purpose is to apply a centripetal force to the thread to prevent the locking nut from loosening. The high-quality locking nut sold in the market is embedded with a copper small piece on the inner circular surface of the nut that matches the thread of the locking nut, to avoid direct contact between the radial locking screw and the locked thread and damage to the latter. This type of locking nut is gradually being applied in shaft end locking situations of rotating motion parts, such as anti loosening of ball screw mounting end bearings.
A specialized locking nut needs to be used together with a locking gasket. The dedicated anti loosening nut is not a hexagonal nut, but a medium round nut with 3, 4, 6, or 8 notches on the circumference of the nut (depending on the size of the nut and the manufacturer's product series). These notches are not only the focus of tightening tools, but also the entry point of the anti loosening pad clamp.
Usage products
Lock nuts made of different metals can be applied to different temperature conditions; However, due to the deformation resistance of the metal material itself, the deformation of the all-metal nut is not easy to control, which will lead to a relatively large dispersion of the anti-loosening torque, which is easy to cause the assembly to be cized; In addition, after the assembly of this kind of lock nut, due to the effect of friction, it is easy to cause damage to the coating on the thread surface, which affects the anti-corrosion performance.
Precautions:
When assembling the all-metal lock nut, the speed of the assembled tool should not be too high; If it is a lock nut with galvanized, Dacromet and other surface treatments, it should be lubricated first when used; The all-metal lock nut can be reused, but should not be installed more than 5 times.
| Thread size | M3 | M4 | M5 | M6 | M7 | M8 | M10 | M12 | M14 | M16 |
| Pitch | 0.5 | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 |
| Fine teeth | - | - | - | - | - | 1 | 1 | 1.5 | 1.5 | 1.5 |
| Fine teeth | - | - | - | - | - | - | 1.25 | 1.25 | - | - |
| minimum | 6.01 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 |
| Maximum = Nominal value | 3.7 | 4.2 | 5.1 | 6 | 7 | 8 | 10 | 12 | 14 | 16 |
| minimum | 3.4 | 3.9 | 4.8 | 5.7 | 6.5 | 7.5 | 9 | 11 | 12 | 14 |
| Maximum = Nominal value | 5.5 | 7 | 8 | 10 | 11 | 13 | 17 | 19 | 22 | 24 |
| minimum | 5.32 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 |
| Thread size | M18 | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M39 | - |
| Pitch | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | - |
| Fine teeth | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | - |
| Fine teeth | 1.5 | 1.5 | 1.5 | - | - | - | - | - | - | - |
| minimum | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | - |
| Maximum = Nominal value | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | - |
| minimum | 16 | 18 | 20 | 22 | 25 | 28 | 31 | 34 | 37 | - |
| Maximum = Nominal value | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | - |
| minimum | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | - |
Frequently Asked Questions (FAQ)
Q:
What is the purpose of the threaded holes on the outer surface of the lock nut?
These holes are used to screw in small diameter countersunk screws, applying a centripetal force to prevent the locking nut from loosening.
Q:
How does a high-quality lock nut prevent damage to the locked thread?
It is embedded with a small copper piece on the inner circular surface of the nut, avoiding direct contact between the radial locking screw and the locked thread.
Q:
What are the notches on a specialized locking nut used for?
These notches act as the focus point for tightening tools and serve as the entry point for the anti-loosening pad clamp.
Q:
Why is the deformation of all-metal lock nuts difficult to control?
Due to the inherent deformation resistance of the metal material itself, which can cause a large dispersion of the anti-loosening torque and potential assembly issues.
Q:
How many times can an all-metal lock nut be safely reused?
All-metal lock nuts can be reused, but they should not be installed more than 5 times.
Q:
What precautions should be taken when using galvanized or Dacromet treated lock nuts?
Lock nuts with surface treatments such as galvanization or Dacromet should be lubricated first before they are used.