A nylock nut, 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. Nylock is the brand name of the most popular nylock lock nuts. Nyloc nuts can operate in temperatures up to 248˚F. Therefore, they are heat resistant. The material of Nylock nuts contains alloy steel and stainless steel.
A nylon pellet nut is identical to a nylock nut except that it uses one or smaller nylon inserts instead of a ring of nylon. They do not lock as strongly as nyloc nuts. Nyloc nuts are available in two types “P” and “T.” The difference between the two is that type “T” are shallower than type “P.” Nyloc nuts are available in a range of sizes in zinc-plated and stainless steel.
How does Nylock nut Function?
You place the nylon collar insert at the end of the Nut, with an inner diameter (ID) slightly smaller than the major diameter of the screw. The screw thread does not cut into the nylon insert; however, the insert deforms elastically over the threads as tightening pressure increases. The insert locks the Nut against the screw due to friction by the radial compressive force resulting from the deformation of the nylon. Nyloc nuts retain their locking ability up to 250 °F.
What are locknuts, and how do you use them?
The Nylock Nut is an economic locking nut ideal for applications where vibration or motion could loosen or undo the Nut. The Nut can also seal the bolt thread against seepage of oil, water, petrol, paraffin, and other liquids.
What is a KM Lock Nut?
A lock nut is a stiff nut that doesn’t loosen when vibrations occur. Earlier, people had to use two nuts in applications where vibrations were frequent. By using two nuts simultaneously, they controlled loosening due to vibrations. Later, manufacturing companies realized that the process could be more economical because using two nuts cost just double.
Types of self-locking nuts
There are two self-locking nuts: metal lock nuts and nylon insert lock nuts. The ball screw lock nuts have both a screw and a nut with matching grooves with ball bearings moving between them. Ball bearings are a critical part of ball screws since it increases power efficiency by reducing friction during the ball’s movement and Nut.
When should you use Nylock nuts?
We use Heavier nylon insert lock nuts in buildings, bridges, and railroad equipment because these nylon locknuts are unsuitable for applications requiring high temperatures or coming into contact with certain types of chemicals.
Can we reuse Nylock nuts?
Lock Nuts with a Nylon Insert are the most reliable lock nut, but the high temperature of the application adversely affects them. However, regulatory authorities differ on whether we should reuse lock nuts. You can reuse them if the prevailing torque meets certain specifications.
According to Carroll Smith Nuts, Bolts, and Fasteners handbook, the nylon insert doesn’t spoil because of installation, so that you can reuse them several times. Even Federal Aviation Administration Advisory Circular permits the reuse of nylock nuts if the prevailing torque is within specification.
However, US Air Force Technical Order strongly suggests replacing self-locking nuts in critical areas. There are specifications for aerospace-grade self-locking nuts requiring the running torque after several cycles of assembly but without preloading the fastener.
Do Nylock nuts affect torque?
There are Nylock, elastic stop nuts, and all-metal lock nuts. The general rule is to add the prevailing torque while applying torque to a Nylock nut because the prevailing torque doesn’t add to bolt tightening. We need to control the friction.
How do you fix Nylock Nut?
It’s a very simple process, just like you handle the end of the bolt. First, hand-tighten the lock nut and subsequently use a torque wrench to tighten it until the lock nut reaches the desired torque level.
Nylock nuts are made from which material?
Nylock Clinch Nuts are available in various thread sizes and are manufactured from electro-zinc plated carbon steel and 300 series stainless steel. These are suitable for installation in tensile steel and aluminum panels with a recommended maximum hardness of 70 HRB.
What grade are Nylock nuts?
Grade C nylon insert lock nuts are hex nuts with a nylon collar inserted in one end of the Nut. The nylon insert increases friction on the screw thread, which resists loosening. 16.6. ASME B18 governs dimensional specifications.
Nylock nuts vs. plain Self-locking nuts
A nylock nut is better at remaining on the thread, reducing the risk of self-disassembly and possibly giving an audible warning before a failure occurs.
Are Nylock nuts effective?
Nylon lock nuts, or stop nuts, as they’re also called, are economical and extremely effective. They have a nylon insert, or collar, smaller than the thread diameter. As you tighten the nylon insert lock nut, the collar deforms over the mating diameter, creating friction.
