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China DIN 985 Nylon Lock Nut Suppliers - Factory Direct Quality Nuts in Grades 4.8, 8.8, 10.9, 12.9
Basic concepts products
Other names: Root Nut, Anti loosening Nut, Nazi.
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:
- Insert the nylon lock nut into the thread and turn it tightly by hand, taking care not to use force.
- When using power tools for tightening, the torque should be appropriately adjusted to avoid the danger caused by over-tightening.
- Attention should be paid to maintaining the vertical when tightening, so as to avoid unnecessary deviation and failure of the fastening force.
- Tighten the lock nut onto the bolt until it fits snugly against the material it is holding in.
- Then, 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.
- Install the washers at the threaded ends of the correctly sized stainless steel bolts or stud bolts first.
- Replace the nut or bolt that locks the bolt by hand until you encounter resistance so that the nylon is inserted.
- Tighten the lock nut firmly and, by using a wrench, replace the original nut and rotate clockwise.
- If 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 (FAQ)
What are the alternative names for a lock nut?
Lock nuts are also commonly referred to as Root Nuts, Anti-loosening Nuts, or Nazis.
How does a nylon lock nut prevent loosening?
It relies on the interaction force between the nut and bolt engagement threads. Frictional force is created between the nylon insert and the bolt thread, which provides self-locking, especially under dynamic loads.
Can I use power tools to tighten nylon lock nuts?
Yes, but the torque must be appropriately adjusted to avoid over-tightening, and vertical alignment must be maintained to prevent fastening force failure.
What methods improve the thread interaction in lock nuts?
Common methods include improving the thread structure (such as in Schbiler nuts), roughening the nylon nut material, or applying surface treatments directly to the thread.
What thread sizes are covered under the standard specifications?
The standard specifications support thread sizes ranging from M3 up to M48, detailing coarse and fine pitch variations, dimensions, and standard weights.