Lock Washers ーNord-Lock－ (Small O.D.) / Pack
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NLDF
Specification Table
| Part Number |
| NLDF3 |
| Part Number | Applicable Screw | D | d | t | |
| Type | No. | ||||
| NLDF | 3 | M3 | 7 | 3.4 | 2.2 |
| 4 | M4 | 7.6 | 4.4 | ||
| 5 | M5 | 9 | 5.4 | ||
| 6 | M6 | 10.8 | 6.5 | ||
| 8 | M8 | 13.5 | 8.7 | 2.0 | |
| 10 | M10 | 16.6 | 10.7 | ||
| 12 | M12 | 19.5 | 13 | ||
Part Number:
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Part Number
|
|---|
| NLDF3 |
| NLDF4 |
| NLDF5 |
| NLDF6 |
| NLDF8 |
| NLDF10 |
| NLDF12 |
| Part Number |
Standard Unit Price
| Minimum order quantity | Volume Discount | RoHS | I.D. d (mm) | Screw Nominal (M) | Thickness T (mm) | O.D. D (mm) | |
|---|---|---|---|---|---|---|---|---|---|
1.90 € | 1 |
Same day
Stock | 10 | 3.4 | 3 | 2.2 | 7 | ||
1.90 € | 1 |
Same day
Stock | 10 | 4.4 | 4 | 2.2 | 7.6 | ||
1.90 € | 1 | 5 Days | 10 | 5.4 | 5 | 2.2 | 9 | ||
2.03 € | 1 |
Same day
Stock | 10 | 6.5 | 6 | 2.2 | 10.8 | ||
2.16 € | 1 |
Same day
Stock | 10 | 8.7 | 8 | 2 | 13.5 | ||
2.40 € | 1 | Available |
Same day
Stock | 10 | 10.7 | 10 | 2 | 16.6 | |
3.67 € | 1 | Available | 5 Days | 10 | 13 | 12 | 2 | 19.5 |
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Specifications / Overview
■Principle of Lock Washers
A pair of washers with wedge cams on one side and radial ribs on the other side each to compose a self-locking arrangement.
Cam angle (α) is set to be larger than the thread lead angle (β).
When the screw begins to rotate loose, a force is generated by a cam member to push up and separate from the opposite cam member. The rotation is blocked by the wedge effect and the cams will not be separated by more than one thread pitch.
■Proper Installation
Set up correctly as shown in the image to the right.
Do not use together with other washers.
■Cautions on Repeated Use
NLDF can be used repeatedly with a lubricant. Use lubricant for repeated use.
■Heat Resistance Temperature
Temperature limit for NLDF is 500°C.
Do not use in an environment where the temperature limit is exceeded.
Junker Test Result
Example
Counterbore dia. does not need to be increased.
Correct
Incorrect
Incorrect
■About Mating Materials
On the surface of mating materials, there will be impression marks made by the radial teeth of the washers.
The hardness of the mating surfaces should not exceed the hardness of the Nord-Lock Washers.
■Recommended Tightening Torque and Tightening Force
Please refer to the values listed below as guidelines when securing a screw with a lock washer.
There is no self-locking effect when the values are far below recommended values.
If the tightened torque exceeds the recommended values, the screws may become hard to remove or Nord-Lock may be broken.
Screw Tightening Torque and Recommended Tightening Force when Lock Washer is Used.
(Lubricant GTP600)
| NLDF | Applicable Screw M × P | Screw Strength Class A2－70·A4－70 GF = 0.65 µg = 0.14, µw = 0.14 | Screw Strength Class A2－80·A4－80 GF = 0.65 µg = 0.14, µw = 0.14 | ||
| Torque Nm | Tightening Force kN | Torque Nm | Tightening Force kN | ||
| 3 | 3 × 0.5 | 0.9 | 1.5 | 1.2 | 2 |
| 4 | 4 × 0.7 | 2 | 2.6 | 2.7 | 3.4 |
| 5 | 5 × 0.8 | 3.9 | 4.1 | 5.3 | 5.5 |
| 6 | 6 × 1.0 | 6.9 | 5.9 | 9.2 | 7.8 |
| 8 | 8 × 1.25 | 17 | 11 | 22 | 14 |
| 10 | 10 × 1.5 | 33 | 17 | 43 | 23 |
| 12 | 12 × 1.75 | 56 | 25 | 75 | 33 |
" ! "GF: Coefficient at the Yield Point µg: Coefficient of Friction at Screw Thread µw: Coefficient of Friction in Washer
Basic information
| Type (Application) | Locking | Type | Nord-Lock | Material | Stainless Steel |
|---|---|---|---|---|---|
| Surface Treatment | Not Provided | Sales Unit | Low Quantity (Available beginning with 1 pc.) | Material: Stainless Steel | EN 1.4404 Equiv. |
| Surface Treatment (Detailed) | Not Provided |
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I.D. d(mm)
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