Sealing the bolt thread from corrosion
Sealing the bolt thread from corrosion
(OP)
Hello, Is there a thread sealant that allows to seal the metal from corrosion and keep the tightening torque unaltered? I have to use torque-to-yield bolts, for a car subframe and engine mount, this bolts are designed to stretch during the torquing.
I think about threadlocker, grease, silicone but they are all liquid and I guess they reduce the friction in the threads changing the torque specs
I think about threadlocker, grease, silicone but they are all liquid and I guess they reduce the friction in the threads changing the torque specs
RE: Sealing the bolt thread from corrosion
Loctite 290 would be the perfect match for the requirements you have provided as it can be applied after installation.
TTY, however, eliminates the problems associated with friction as you're tightening to an angle and not a torque. Galling should be of concern for TTY bolts as they have more degree of rotation under high stress than conventional torquing. Automotive fasteners come with a lubricating coating pre-applied to prevent galling.
RE: Sealing the bolt thread from corrosion
does the air that remains trapped between the various grooves of the thread cause corrosion?
I think the best is to completely cover the thread with something but I’m not sure if the torque values will change
RE: Sealing the bolt thread from corrosion
If you specify a specific sealant you can adjust your torque procedure to work with that sealant. However, with TTY, this should be unnecessary. The fastener itself sets the clamp load regardless of friction.
Have you considered using capped nuts? There are a few options including weld and adhesive mount nuts.
RE: Sealing the bolt thread from corrosion
RE: Sealing the bolt thread from corrosion
RE: Sealing the bolt thread from corrosion
Exactly?
RE: Sealing the bolt thread from corrosion
RE: Sealing the bolt thread from corrosion
There are also bonded seal washers that prevent fluid ingress with an elastomer seal on the washer itself.