DRAKE STYLE ALL METAL LOCK NUTS
The Drake Style lock nut is a two piece free spinning lock nut that can be positioned anywhere along the length of the threaded part and then locked into place. It can also be installed by initially tightening into place the bottom portion of the nut (portion that looks like a castle nut), developing the desired clamp load on the bolt, and the top nut is then assembled onto the bottom nut to lock the nut to the thread. This special two piece design provides superior holding power as compared to “prevailing torque” style lock nuts in high vibration applications.
The Drake Nut is designed to be used on threaded fasteners up to 125,000 psi in tensile strength (ASTM A193 B7Threaded Rod and SAE J429 Grade 5 Cap Screws).
The Drake Nut’s proprietary two piece design and its heat treated carbon steel material develops higher clamping loads than a corresponding size of a Grade 5 jam nut. The wedging action that is developed when the top nut is tightened down onto the bottom nuts develops greater prevailing torque than are developed by standard lock nut designs.
The flexible slotted crown of the lower nut is compressed inwards toward the axis of the bolt by tightening the upper nut, thus clamping the lower nut to the bolt.
The faces of the top and bottom nut are not drawn completely together, since all contact between them is made on their mating beveled surfaces. This prevents the overheating and galling that occurs with standard lock nuts andalso makes this style nut reusable.
The Drake Nut is used in applications requiring high vibration resistance such as stationary power plant engines,diesel engine, aircraft engines and many other applications.
| Size. |
Light Series |
Regular (Medium) Series |
Heavy Series |
| |
ID |
OD |
Thickness* |
W |
ID |
OD |
Thickness* |
W |
ID |
OD |
Thickness* |
W |
| |
Min |
Max |
Min |
Nom |
Min |
Max |
Min |
Nom |
Min |
Max |
Min |
Nom |
| 1 5/8 |
1.633 |
2.487 |
.344 |
.391 |
1.633 |
2.553 |
.389 |
.424 |
1.633 |
2.694 |
.458 |
.491 |
| 1 3/4 |
1.758 |
2.613 |
.344 |
.391 |
1.758 |
2.679 |
.389 |
.424 |
1.758 |
2.820 |
.458 |
.491 |
| 2 |
2.008 |
2.840 |
.384 |
.393 |
2.008 |
2.936 |
.422 |
.427 |
2.008 |
3.144 |
.496 |
.526 |
| 2 1/4 |
2.262 |
3.195 |
.422 |
.427 |
2.262 |
3.221 |
.440 |
.442 |
2.262 |
3.398 |
.496 |
.526 |
| 2 1/2 |
2.512 |
3.145 |
.422 |
.427 |
2.512 |
3.471 |
.440 |
.442 |
2.512 |
3.648 |
.496 |
.526 |
| 2 3/4 |
2.762 |
3.758 |
.458 |
.458 |
2.762 |
3.824 |
.458 |
.491 |
2.762 |
3.910 |
.526 |
.532 |
| 2 3/4 |
3.012 |
4.008 |
.458 |
.458 |
3.012 |
4.074 |
.458 |
.491 |
3.012 |
4.160 |
.526 |
.532 |