Whats with the red square?

[jake]

All ten carrier bolts have the red stamping on them, could someone tell me why?

 

[commando1]

Manufacturer's ID mark, that's all.
Auto manufacturers require a Manufacturer's ID mark on every single nut and bolt they use.

Look at every nut and bolt you have removed from a car. You can find out who made them from directories printed just with identification marks.

 

[jake]

Thanks, I just never seen them painted red before.

 

[commando1]

Me neither. Maybe it was some kind of QC mark applied when installed. Or the assembly line lady was doing her nails on break and was bored.

I bet that guy on Graveyard Cars even knows who that manufacturer was and what dates they were used. Lol.

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[65 500]

If the nuts were tight and you had to use a wrench or socket to turn them all of the way off of the threads the dimples are probably because they are self-locking nuts. I don't know if they were used on the carrier or not, but I know they were used on the u-bolts that hold the leaf springs to the rear-end housing. The dimple crushes the nut a little so that the threaded hole is no longer round and the nuts won't back off.

 

[commando1]

To me, the red marking is what's unusual.

 

[bulldogchesty]

Looks to me that the red plastic is a locking feature, and I now a lot about nuts, I have 10, make that 9 brothers and sisters.

 

[bluefury361]

Looks to me that the red plastic is a locking feature, QUOTE]

Gold star on your forehead ....... :icon_thumleft:

 

[bulldogchesty]

Was someone being sarcastic?:laughing4:

 

[commando1]

If the nuts were tight and you had to use a wrench or socket to turn them all of the way off of the threads the dimples are probably because they are self-locking nuts.

I forgot all about that from my aircraft days...
I had to learn every fastener FAA approved.

Still, that red, though....

 

[commando1]

I know.
When torqued to the required spec, it was a Q/A dab...
And probably showing they are NOT to be reused.
Yes. that's it. It's coming back to me.

 

[bluefury361]

Was someone being sarcastic?:laughing4:

NO ..... thats exactly right. The nut is drilled and that red is a thread locker. It's not a paint dab.
Paint dabs are usually a means for a production inspector to determine that a fastener has been properly torqued.

 

[commando1]

NO ..... thats exactly right. The nut is drilled and that red is a thread locker. It's not a paint dab.

I want on the scene verification that someone drilled holes in the center of the side crimp of hex nuts , to insert Loctite Red....
Jake???

Looks like a paint dab...

 

[65 500]

I want on the scene verification that someone drilled holes in the center of the side crimp of hex nuts , to insert Loctite Red....
Jake???

Looks like a paint dab...

I think what bluefury is talking about is a nylon insert as a means of making the nut self-locking, as opposed to a hole to put Loctite in, but I have never seen a self-locking nut with the nylon insert that went all of the way through the nut, with that said, there are a lot of things that I have never seen. :icon_biggrin: I have no idea why it would be red.

Oops, I went back and reread the thread and that was Bulldog that mentioned the insert.ops:

 

[bulldogchesty]

At our aircraft site we used torque stripe to verify that the nut or bolt was not removed.