Nylon insert locknuts vs. Loctite threadlocker
Nylon insert locknuts vs. Loctite threadlocker
(OP)
Anyone know the advantages/disadvantages of nylon insert locknuts vs. Loctite threadlocker used with standard nuts?
Thank you!
Thank you!
RE: Nylon insert locknuts vs. Loctite threadlocker
An assembly tech can't forget to put an nylon insert on a nut.
Contaminates on the bolt don't significantly change the performance of a nylon insert.
Nylon inserts don't require extra steps during assembly.
I've seen techs apply loctite, spin the nuts down finger tight, then go to lunch. Come back from lunch and torque the nuts, breaking the loctite bond in the process.
A nylon insert will be effective for a few install and remove cycles. Loctite is one-shot. So if it's a part the needs to be removed for maintenance, the maintainer will probably put the nylon nut back on. He probably won't clean and reapply loctite.
Loctite is theoretically better then nylon inserts, but there are more opportunities for assembly techs to mess it up. Nylon inserts are more real-world proof.
RE: Nylon insert locknuts vs. Loctite threadlocker
RE: Nylon insert locknuts vs. Loctite threadlocker
If I was wishing to make a joint vibration proof I would use these Nordlock washers.
I have seen these used in all sort of machinery with good effect.
http:/
desertfox
RE: Nylon insert locknuts vs. Loctite threadlocker
RE: Nylon insert locknuts vs. Loctite threadlocker
In the world of hired techies, I have to agree Nylocs have their advantages...
RE: Nylon insert locknuts vs. Loctite threadlocker
RE: Nylon insert locknuts vs. Loctite threadlocker
Chris Loughnane - Product Design
http://www.pdnotebook.com
http://www.twitter.com/DesignNotebook
RE: Nylon insert locknuts vs. Loctite threadlocker
And I know you didn't mention the deformed style of locknut. They are cheap, but they are not reusable. And bad nuts can damage the thread of the fastener.
ISZ
RE: Nylon insert locknuts vs. Loctite threadlocker
Liquid threadlockers can be preapplied via microencapsulation, which interferes less with assembly torque.
Mike Halloran
Pembroke Pines, FL, USA
RE: Nylon insert locknuts vs. Loctite threadlocker
Both nylocks and loctite are generally avoided in aircraft fasteners. However, given the choice between the two, a nylock nut would probably be better.
The reason for this is that the prevailing torque of the nylock nut can be verified at installation. So it is more reliable from a QA standpoint.
There is no way to verify the threadlock function of loctite without loosening the nut. So the use of loctite requires a carefully controlled process performed by trained personnel to guarantee quality assurance.
Regards,
Terry
RE: Nylon insert locknuts vs. Loctite threadlocker
RE: Nylon insert locknuts vs. Loctite threadlocker
RE: Nylon insert locknuts vs. Loctite threadlocker
Chris Loughnane - Product Design
http://www.pdnotebook.com
http://www.twitter.com/DesignNotebook
RE: Nylon insert locknuts vs. Loctite threadlocker
For a blind tapped hole application they will work if you can't use loctite for one of the reasons noted above.
Castle nuts aren't very good.
It's common that the specified torque doesn't happen when the holes are lined up. Then you don't know what the assembly tech will do. More tighter might yield the fasteners. More looser will not have the necessary preload.
There will be clearance between the hole through the bolt, the slots in the nut and whatever pin you use. Therefor there can be relative rotation and loss of preload.
Castle nuts are ok for applications where the bolt is used as a pin and all you need to do is keep the nut from falling off. They are no good for maintaining preload.
RE: Nylon insert locknuts vs. Loctite threadlocker
from mcmaster...
Flex-Top Expanding Hex Locknuts
Stronger than nylon-insert locknuts of the same size, these nuts are made from a single piece of metal. Also known as Flexloc nuts, they have a slotted top that expands when the nuts are tightened—locking them in place and providing superior vibration resistance. Nuts are not rated for hardness. Inch sizes have a Class 2B thread fit; metric have a Class 6H thread fit. Cadmium-plated steel nuts are made from low strength steel.
Chris Loughnane - Product Design
http://www.pdnotebook.com
http://www.twitter.com/DesignNotebook
RE: Nylon insert locknuts vs. Loctite threadlocker
Harold
SW2010 SP3.0 OPW2010 SP1.0 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: Nylon insert locknuts vs. Loctite threadlocker
1) You don't need MSDS sheets for Nylock nuts.
2) Loctite will attack and crack some polymers. When using plastics, and in doubt, leave the Loctite out.
Charlie
www.facsco.com