I'm getting ready to install my new OME suspension with MAF U-Bolt Flip Kit. What does the MUD brain trust say about where to put anti-seize and where not to?
Where to use/not use Anti-Seize
- Thread starter slcfj62
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dgangle
total rice
put never-sieze where there are things you want to take apart later and not on places you won't.
put loc-tite on places you don't want to come apart and not on places you do.
put loc-tite on places you don't want to come apart and not on places you do.
- Thread starter
- #3
So, no problem on the U-Bolt threads? I've always wondered about anti-seize on bolts that get torqued.
Technically any lubricant in the threads will increase the fastener tension resulting from a given torque. Whether that increase matters or not depends what lubricant (or not) the torque spec was figured for. Say the torque was figured with grease on the threads and would result in 1000 lbs of tension in the fastener, only you put it together dry. It might only have 800 lbs. of tension due to frictional losses.
OTOH if it was figured for clean & dry, but you use grease then you might have 1200 lbs. tension in the fastener. Whether the difference matters depends on the size and strength of the fastener.
With a U-Bolt I know that you can pull them down too tight. I have seen an axle tube slightly crushed from this. It took a Snap-On 2 foot long breaker bar and all of my leg strength to loosen those 5/8" U-Bolts.
As a practical matter I'd use anti-seize on those threads (I do) and be reasonable about how tight you take them.
OTOH if it was figured for clean & dry, but you use grease then you might have 1200 lbs. tension in the fastener. Whether the difference matters depends on the size and strength of the fastener.
With a U-Bolt I know that you can pull them down too tight. I have seen an axle tube slightly crushed from this. It took a Snap-On 2 foot long breaker bar and all of my leg strength to loosen those 5/8" U-Bolts.
As a practical matter I'd use anti-seize on those threads (I do) and be reasonable about how tight you take them.
As a general rule of thumb, when you use anti-seize, you should reduce the torque spec by about 15% ...
A more specific chart, depending on type of lubricant and fastener material :
LUBRICANT OR PLATING TORQUE CHANGES
Oil Reduce torque 15% to 25%
Dry Film (Teflon or moly based) Reduce torque 50%
Dry Wax (Cetyl alcohol) Reduce torque 50%
Chrome plating No change
Cadmium plating Reduce torque 25%
Zinc plating Reduce torque 15%
I use anti-seize on all fasteners that don't specifically call for a thread-locker, at 15% torque reduction, including U-bolts and spring pins, etc...
A more specific chart, depending on type of lubricant and fastener material :
LUBRICANT OR PLATING TORQUE CHANGES
Oil Reduce torque 15% to 25%
Dry Film (Teflon or moly based) Reduce torque 50%
Dry Wax (Cetyl alcohol) Reduce torque 50%
Chrome plating No change
Cadmium plating Reduce torque 25%
Zinc plating Reduce torque 15%
I use anti-seize on all fasteners that don't specifically call for a thread-locker, at 15% torque reduction, including U-bolts and spring pins, etc...
but that makes sense
always use it on caliper bolts and knockle studs
...And never use it on wheel studs.
So do I. Never had an issue with the lug nuts coming loose. Just take care to not get it on the conic seating surface of the lug nuts.
x2......
Yeah, I forgot to add that little detail.
Threads=no worries. Seat/taper= no bueno. I even happen to have some on my own studs right now. What can I say, it was late?
I use anti-seize on my Onion Bagels every morning.
Keeps my insides from freezing up.
Keeps my insides from freezing up.
That right there is a visual that I didn't need. Thanks Spike........
I've been hoping to pull out my torque calc ref sheet and see just how accurate those RoT's are, but I've had to actually work this morning.
I've been hoping to pull out my torque calc ref sheet and see just how accurate those RoT's are, but I've had to actually work this morning.
Randy, I have a saved page from some time ago with those valves (from a bolt place) ... I'll see if I can find the original page.
I use it on my girlfriend...
I use it on my girlfriend...
Then that's definitely a situation where you are not using your tools right ! (i.e. self-lubricating with sufficient warm up
)
x2 antiseize everything that doesn't specify loc-tite.
Makes retorquing things like ubolts more accurate if the nuts don't bind.