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China Suppliers Factory DIN 985 Refined Nylon Lock Nut - Grade 4.8, 8.8, 10.9, 12.9, Various Materials Available
Basic concepts products
1. Other names: Root Nut, Anti loosening Nut, Nazi.
2. Usage: Lock threaded external joints or other pipe fittings.
The working principle of a nut is to use the frictional force between the nut and the bolt for self-locking. However, the reliability of this self-locking will decrease under dynamic loads. In some important occasions, we will take some anti loosening measures to ensure the reliability of nut locking. Locking nuts are one of the anti loosening measures.
The anti loosening effect of nylon locking nuts mainly depends on the interaction force between the nut and bolt engagement threads. There are many ways to improve the interaction force between the meshing threads, such as improving the thread structure of the Schbiler nut, roughening the nylon nut, and surface treatment of the thread.
Usage products
Nylon lock nuts are used as follows:
- 1Insert the nylon lock nut into the thread and turn it tightly by hand, taking care not to use force.
- 2When using power tools for tightening, the torque should be appropriately adjusted to avoid the danger caused by over-tightening.
- 3Attention should be paid to maintaining the vertical when tightening, so as to avoid unnecessary deviation and failure of the fastening force.
- 4Tighten the lock nut onto the bolt until it fits snugly against the material it is holding in.
- 5Then, tighten the second nut onto the lock nut so that the teeth of the lock nut bite the thread of the bolt, locking it in place.
- 6Install the washers at the threaded ends of the correctly sized stainless steel bolts or stud bolts first.
- 7Replace the nut or bolt that locks the bolt by hand until you encounter resistance so that the nylon is inserted.
- 8Tighten the lock nut firmly and, by using a wrench, replace the original nut and rotate clockwise.
- 9If the bolt head is tight, use the same second wrench to tighten it while tightening the nut.
| Thread size | M3 | M4 | M5 | M6 | M7 | M8 | M10 | M12 | M14 | M16 | M18 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pitch | Coarse teeth | 0.5 | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
| Fine teeth 1 | / | / | / | / | / | 1 | 1 | 1.5 | 1.5 | 1.5 | 2 | |
| Fine teeth 2 | / | / | / | / | / | / | 1.25 | 1.25 | / | / | 1.5 | |
| minimum | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 14 | 16 | 18 | |
| maximum | 3.45 | 4.6 | 5.75 | 6.75 | 7.75 | 8.75 | 10.8 | 13 | 15.1 | 17.3 | 19.5 | |
| minimum | 4.6 | 5.9 | 6.9 | 8.9 | 9.6 | 11.6 | 15.6 | 17.4 | 20.5 | 22.5 | 24.9 | |
| minimum | 6.01 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 | 29.56 | |
| Maximum = Nominal value | 4 | 5 | 5 | 6 | 7.5 | 8 | 10 | 12 | 14 | 16 | 18.5 | |
| minimum | 3.7 | 4.7 | 4.7 | 5.7 | 7.14 | 7.64 | 9.64 | 11.57 | 13.3 | 15.3 | 17.66 | |
| minimum | 2.4 | 2.9 | 3.2 | 4 | 4.7 | 5.5 | 6.5 | 8 | 9.5 | 10.5 | 13 | |
| minimum | 1.65 | 2.2 | 2.75 | 3.3 | 3.85 | 4.4 | 5.5 | 6.6 | 7.7 | 8.8 | 9.9 | |
| Maximum = Nominal value | 5.5 | 7 | 8 | 10 | 11 | 13 | 17 | 19 | 22 | 24 | 27 | |
| minimum | 5.32 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 | 26.16 | |
| 1,000 pieces weigh kg | 0.5 | 1 | 1.4 | 2.4 | 3 | 5.1 | 10.6 | 17.2 | 26 | 34 | 45 | |
| Thread size | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | |
| Pitch | Coarse teeth | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 |
| Fine teeth 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | |
| Fine teeth 2 | 1.5 | 1.5 | / | / | / | / | / | / | / | / | / | |
| minimum | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 | |
| maximum | 21.6 | 23.7 | 25.9 | 29.1 | 32.4 | 35.6 | 38.9 | 42.1 | 45.4 | 48.6 | 51.8 | |
| minimum | 27.7 | 29.5 | 33.2 | 38 | 42.7 | 46.6 | 51.1 | 55.9 | 60.6 | 64.7 | 69.4 | |
| minimum | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 72.09 | 76.95 | 82.6 | |
| Maximum = Nominal value | 20 | 22 | 24 | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 | |
| minimum | 18.7 | 20.7 | 22.7 | 25.7 | 28.7 | 31.4 | 34.4 | 37.4 | 40.4 | 43.4 | 46.4 | |
| minimum | 14 | 15 | 15 | 17 | 19 | 22 | 25 | 27 | 29 | 32 | 36 | |
| minimum | 11 | 12.2 | 13.2 | 14.8 | 16.5 | 18.2 | 19.8 | 21.5 | 23.1 | 24.8 | 26.5 | |
| Maximum = Nominal value | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | |
| minimum | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.8 | 68.1 | 73.1 | |
| 1,000 pieces weigh kg | 65 | 75 | 100 | 162 | 212 | 317 | 415 | 499 | 628 | 771 | 998 | |
Frequently Asked Questions
What are the other common names for lock nuts?
Lock nuts are also commonly referred to as Root Nuts, Anti loosening Nuts, or Nazis.
What is the primary usage and working principle of a lock nut?
Lock nuts are used to lock threaded external joints or other pipe fittings. They work by using the frictional force between the nut and the bolt for self-locking, which prevents loosening under dynamic loads.
How can the anti-loosening effect of nylon locking nuts be improved?
The anti-loosening effect depends on the interaction force between the engagement threads. This force can be improved by modifying the thread structure (such as the Schbiler nut), roughening the nylon nut, or applying surface treatments to the thread.
What precautions should be taken when using power tools to tighten nylon lock nuts?
When using power tools, the torque must be appropriately adjusted to avoid over-tightening. Additionally, care should be taken to maintain vertical alignment during tightening to prevent deviation and fastening force failure.
How do you ensure the nylon lock nut locks securely onto the bolt?
Tighten the lock nut onto the bolt until snug, and then tighten a second nut onto the lock nut. This allows the teeth of the lock nut to bite the thread of the bolt, locking it securely in place.