Locking nuts refer to the vast range of nuts that are used for providing some sort of locking arrangement in an assembly.
These could be nuts that are used singly or in tandem to provide the locking effect.
A variety of locking nuts available in ready stock with us.
Self Locking Nuts
These nuts have a self-contained arrangement that provides the locking mechanism. Prime examples are Nylon Lock Nuts and Metal Lock Nuts.
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 insert that resists turning.
Nylon lock nuts differ from a standard hex nut in that they have a nylon insert secured within the nut. The nylon insert is located in a tapered section located at the back of the nut.
Always fix a Nylock Nut with the metal thread going on first.
Inspect the nylon insert of the lock nut to ensure that it is intact after installation.
Caution – A nylock nut should only be used once and the nylon insert no longer performs its function to 100% of design. Therefore nylock nuts should be discarded and replaced after each use.
Metal Lock Nuts
All Metal lock nuts work on the principle of a slight deformation in the nut. Locking is achieved by deformation of the last thread. This is a top locking style nut.
Are also known as half-thickness nut or a split nut; these are used as a locknut or jam nut.
Often used in pairs or in conjunction with a hexagon full nut in a locking arrangement.
The thin nut must be put in place first and the full nut after that.
The thin lock nut should be used first and tightened to between 25% to 50% of the overall required torque.
The thin nut is then held in place while the second thicker nut is then installed and tightened to full torque.
Available as per DIN 439, ISO 4035 and ASME B18.2.2
It consists of a nut in a spring steel cage which wraps around the nut. The cage has two wings that when compressed allow the cage to be inserted into the square holes, for example, in the mounting rails of equipment racks. When the wings are released, they hold the nut in position behind the hole.
Cage nuts conforming to this description were patented in 1952 and 1953.This design requires insertion tools to install the cage nut into the hole. Newer designs featuring a squeeze-and-release tab allow for tool-less installation
Flange Nuts DIN 6923
Serrated flange nut or Flange lock nut has a flange shape above the hexagonal body surface which increases its bearing surface allowing them to be used with irregular oversized holes.
The ﬂange offers protection for the bolted component where the driving tool may otherwise scratch it’s surface. The ﬂange also lessens the need to use a washer.
Other Locking Nuts – Keps, Pal
Keps nut, (also called a k-lock nut or washer nut), is a nut with an attached, free-spinning washer.
It is used to make assembly more convenient.
The locking action is achieved when the nut is tightened against a bearing surface as the teeth of the lock washer dig into it.
Self-Locking Counter Nuts [PAL NUT]
Palnuts are made to DIN 7967 and most commonly referred to as counter nuts, stamped sheet metal check-nuts or self locking counter nuts. Used for axial locking.
These locknuts are made from a spring-like steel which allows them to distort under load pressure, before returning to their original shape in the threaded area.
The Pal Nut is screwed on the bolt on top of an ordinary nut, and has a series of protruding barbs that locks the nut in place when the nut is tightened
They are very lightweight and host a low profile and the ability to be tightened with an internal wrench or fingers.
This provides a vibration resistant locking action whilst remaining usable in small and tricky areas suffering from space restrictions.
These nuts may be used alone for load-carrying in light duty assemblies or they may be used on top of ordinary nuts to assure tightness of high-stress assemblies.
They offer impressive savings over alternative fasteners in initial cost, assembly time, weight and space.
They are removable, reusable, and self-cleaning. They are unaffected by temperatures up to 400 degrees.