China Suppliers Factory DIN 985 Nylon Lock Nut - Grade 4.8, 8.8, 10.9, 12.9 with Various Surface Treatments
Basic concepts products
- Other names: Root Nut, Anti loosening Nut, Nazi.
- Usage: Lock threaded external joints or other pipe fittings.
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 | |
A1: Lock nuts are also commonly referred to as Root Nuts, Anti-loosening Nuts, or Nazis.
A2: Lock nuts are primarily used to lock threaded external joints or other pipe fittings securely in place.
A3: The anti-loosening effect mainly depends on the interaction force between the nut and the bolt engagement threads. This can be enhanced by improving the thread structure, roughening the nylon nut, or applying surface treatments to the thread.
A4: When using power tools, you must appropriately adjust the torque to avoid potential dangers caused by over-tightening, and ensure you maintain vertical alignment during tightening.
A5: The system works by utilizing the frictional force between the nut and the bolt for self-locking. Because this reliability can decrease under dynamic loads, special lock nuts are used as an anti-loosening measure.
A6: Tighten the lock nut onto the bolt until snug, then tighten a second nut onto the lock nut so that the teeth of the lock nut bite into the thread of the bolt, locking it firmly in place.