A distorted thread locknut,
[McMaster, p]
3139
is a type of
locknut
A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut,. stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that def ...
that uses a deformed section of
thread to keep the
nut
Nut often refers to:
* Nut (fruit), fruit composed of a hard shell and a seed, or a collective noun for dry and edible fruits or seeds
* Nut (hardware), fastener used with a bolt
Nut or Nuts may also refer to:
Arts, entertainment, and media Co ...
from loosening from vibrations or rotation of the clamped item. They are broken down into four types: elliptical offset nuts, centerlock nuts, toplock nuts and partially depitched (Philidas) nuts.
High temperature use
Because these nuts are solid metal, they are effective in elevated temperature settings, unlike
nyloc nut
A nyloc nut, also referred to as a nylon-insert lock nut, polymer-insert lock nut, or elastic stop nut, is a kind of locknut with a nylon collar that increases friction on the screw thread.
The nylon collar insert is placed at the end of the nut, ...
s. High
grade
Grade most commonly refers to:
* Grade (education), a measurement of a student's performance
* Grade, the number of the year a student has reached in a given educational stage
* Grade (slope), the steepness of a slope
Grade or grading may also ref ...
nuts can withstand temperatures up to .
Safety factors
High strength distorted thread nuts cannot be used with low strength fasteners because the hard nut will act like a
die
Die, as a verb, refers to death, the cessation of life.
Die may also refer to:
Games
* Die, singular of dice, small throwable objects used for producing random numbers
Manufacturing
* Die (integrated circuit), a rectangular piece of a semicondu ...
and destroy the threads on the fastener.
Elliptical offset nuts
Elliptical offset nuts is a catch-all category that encompasses designs known as oval locknuts
or non-slotted hex locknuts,. The salient feature is that the thread form has been deformed at one end so that the threads are no longer perfectly circular. The deformed end is usually shaped into an ellipse or
obround triangle. These are known as one-way nuts as the nut may be easily started on the male fastener from the bottom non-deformed portion, but are practically impossible to start from the deformed end. As the male fastener reaches the deformed section it stretches the threads of the nut
elastically back into a circle. This action increases the friction between the nut and the fastener greatly and creates the locking action. Due to the elastic nature of the deformation the nuts can be reused indefinitely.
[Smith, pp. 104–105.]
Centerlock nuts
Center lock nuts are similar to elliptical offset nuts, except that they are distorted in the middle of the nut. This allows the nut to be started from either side.
Toplock nuts
Toplock nuts are also similar to elliptical offset nuts, except that the whole thread on one end is not distorted. Instead only three small sections of the thread are deformed on one end.
Partially depitched nuts
Partially depitched nuts are commonly called
Philidas
Philidas Ltd. (previously named Infast Philidas) is a company based in Pontefract, West Yorkshire, England that manufactures nuts and components for automotive and industrial applications.
History
The company was established in 1942, and is a b ...
nuts,
[.] after their originator and current manufacturer, and differ from the above three nut types insofar as a portion of the thread is displaced axially, this being facilitated by one or more slots perpendicular to the axis.
See also
*
Split beam nut A split beam nut, also known as a split hex nut. or slotted beam nut, is a locknut with slots cut in the top that separate the outside end into two. or more sections that are bent slightly inward, making the thread diameter undersized in the slotted ...
References
Notes
Bibliography
*.
*.
{{Nuts (hardware)
Nuts (hardware)