Table of Contents
Locking Nuts Place the lock nut against the threaded end of the bolt, just as you would place an ordinary nut. Hand-tighten the lock nut until it’s securely threaded on to the bolt. Tighten the lock nut with a torque wrench until it reaches the specified torque.
How tight should a lock nut be?
Getting them off a journey when you have a flat could leave you stranded, so they should be nipped up a bit more than finger tight. If the locking nut comes loose, the other wheel nuts should be fully tightened and Torqued.
What is the difference between a nut and a lock nut?
Traditional nuts simply consist of a basic threaded hole, so constant exposure to vibrations can knock them loose from the bolt on which they are placed. Lock nuts protect against loosening, however, by featuring a design that increases the nut’s resistance to vibrations.
How do you tighten nylon nuts?
Slide the socket onto the nylon lock nut and turn the handle of the ratchet clockwise to turn the nylon lock nut onto the fastener. You will feel some resistance from the nylon lock nut as you turn it onto the fastener. This is created by the nylon insert and is completely normal.
What does a stop nut do?
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.
What is a Stover lock nut?
Stover® lock nuts are one-piece hex nuts which derive their prevailing torque characteristics from controlled distortion of their top threads from their normal helical form to a more elliptical shape.
Are lock nuts reusable?
They are able to be reused, but only if the prevailing torque meets certain specifications. Lock Nuts with a Nylon Insert are perhaps the most reliable lock nut, as it is only limited by the temperature of the application it has been used in.
How do Nylock nuts work?
Nyloc nuts feature a nylon collar in the top portion of the nut that locks the nut in place by essentially squeezing the threads of the bolt as the nut is tightened. In scientific terms, the friction that is created by the radial compressive force of the nut turning against the thread prevents it from loosening.
Do you tighten the nut or bolt?
There is no simple answer to this as in some instances, it is perfectly acceptable to tighten the bolt head while holding the nut in place. In other situations, it’s acceptable to tighten the nut. It all depends on the application and the condition of the product or material being worked with.
Should you use a lock washer with a lock nut?
Locking Washers Place the lock washer between the nut and the work surface if using a nut-and-bolt configuration, or between the fastener head and the work surface if using a tapped hole configuration. In other words, the bolt goes straight into the hole and doesn’t poke out the other end, so no nut is used.
Are lock nuts better than lock washers?
Here is the basic breakdown of when you will want to use a locknut over a lock washer: When you need something that can handle the pressure that comes with torquing down a bolt or screw, choose a lock washer. For those home projects that neither need nor can handle the torque required to tighten it, use a locknut.
Do you need to torque Nylock nuts?
Usually nuts are free spinning, but Nylock nuts have a plastic patch that causes resistance to nut turning. This resistance is called “prevailing torque”. Prevailing torque is the torque required to turn the nut. None of the prevailing torque goes toward tightening the bolt.
Which way round does a nut go?
The metal thread goes on first. If you’re talking about a nut with a built in fluid seal, due to its design, a Seal Nut will need to go on with the rubber element on the inside.
Can torque prevailing nut be reused?
The prevailing torque locknuts can be reused only for a limited number of times because each time the nut is used, there is a decline in its prevailing torque quality. That is why it is recommended to use thread lubricants and torque valves.
How many times can you use a Stover nut?
Yes, Stover lock nuts are reusable. Theoretically, the nut’s distorted thread’s elastic nature can allow the nut to be reused infinitely. In practice, the nut loses its elasticity slightly with each use.
What is a cone lock nut?
Conelock Nuts are one piece, all-metal prevailing torque hex nuts and have threads at the top of the nut that are imperfect and cause interference to allow them to lock and not vibrate and become loose. Conelock nuts are not temperature or chemical limited in applications.
What grade is a Stover nut?
Stover Locknuts are offered in grade C with a cadmium and wax finish; and in grade G with a black phos finish. Featuring controlled distortion of its top threads, stover locknuts can withstand high temperatures and severe vibration.
Can you’re use nylon nuts?
For example, Carroll Smith (Carroll Smith’s Nuts, Bolts, Fasteners, and Plumbing Handbook) notes that the nylon insert is not damaged by installation and therefore they can be reused many times, and a Federal Aviation Administration Advisory Circular allows nuts to be reused if the prevailing torque is within.
How many times can you use a Nyloc nut?
Nylock nuts are the most common and inexpensive self-locking aircraft nuts. These elastic insert nuts are inexpensive and almost infinitely reusable. Nylock nut tensile strength is rated at 125,000 psi with a 250°F temperature rating.
Can you reuse self locking bolts?
For self locking nuts, it is acceptable to reuse them as long as there is still some locking action. Because the nut insert hole is smaller than the bolt it creates so much friction between all of the threads that are in contact that the nut cannot vibrate loose.
