This might be a dumb question but, Does anti seize effect torque specs?

As far as I know, it makes them more accurate. The bolt doesn't bind giving the illusion of a higher torque. Make sense?

I hope not..Been using it all my life.....:thumbsup: But if your talking about head bolts best to use a thread sealer..Robert

Dino,
Its a good question and the answer is YES it certainly does. If you use Anti Seize on a fastener, you would have to torque it LESS than without it. It is usually not a good idea to use anti seize on any critical fasteners unless the manufacturer specifies it.

When you tighten a bolt with a torque wrench, you have to use the proper lubricant, if any, that the manufacturer specifies. The reason fpr this is that all the torque wrench is really measuring is friction. The manufacturer wants a bolt to be stretched a certain amount so it can hold properly. When they publish a torque spec, it is so that the bolt will be stretched the amount they want. If you use a different lubricant that they did when they developed the torque spec, you will either not stretch the bolt enough, or stretch it too much.

So once again, yes the AntiSeize wil affect the torque required, and probably should not be used on a critical fastener such as rod bolts.

I set through a 4 hour bolt torque presentation by Lawson Bolts. Anti seize/ Never Seize does effect bolt torque. In the two brands tested it actually took more torque to achieve the same clamping force. Never seize is not a lubricant. Other brands may have different results.

Dino,
Its a good question and the answer is YES it certainly does. If you use Anti Seize on a fastener, you would have to torque it LESS than without it. It is usually not a good idea to use anti seize on any critical fasteners unless the manufacturer specifies it.

When you tighten a bolt with a torque wrench, you have to use the proper lubricant, if any, that the manufacturer specifies. The reason fpr this is that all the torque wrench is really measuring is friction. The manufacturer wants a bolt to be stretched a certain amount so it can hold properly. When they publish a torque spec, it is so that the bolt will be stretched the amount they want. If you use a different lubricant that they did when they developed the torque spec, you will either not stretch the bolt enough, or stretch it too much.

So once again, yes the AntiSeize wil affect the torque required, and probably should not be used on a critical fastener such as rod bolts.




What would be your judgement if specs called for motor and you use antiseize? I ask this cause I see all the time to subtract 5-10lbs if using motor-oil. Are the properties close enogh to use same chart???? I ask this cause of aluminum prducts like intake to aluminum heads..Thanks Robert

Heard too many times similar to Bill, anti seize changes the readings. 10 lbs seems to be the consensus. Im no scientist though...

All I can say is when Im using it bolts thread in much smoother and easier than without it. Bet theres something to it.

1st off thanks everyone, I use permatex 133A. And i was wondering about areas like brake caliper bolts and such. Also should i use it on body bolts?

I do not use Anti-Seize for internal motor bolts but will use the recommended Molly-Lub by specific Mfgr's and Lock Tight or RTV where required; however, for some External Motor Bolts and ALL Chassis Bolts Anti-Seize is a MUST in my Book.

1st off thanks everyone, I use permatex 133A. And i was wondering about areas like brake caliper bolts and such. Also should i use it on body bolts?

I've ALWAYS used anti-seize on those 2 fasteners specifically.

Never use anti sieze on any bolt that comes in contact with oil inside the engine or you'll have bad bearings in short order.
I'll never forget when young Mikey rebuilt his first complete small engine at the shop. Mounted on a test stand that we had and rolled it outside. Fired it up and boy did it run good, for about 5 mins. Then it seized up tight as can be. I guess he'd put liberal amounts of anti seize on the rod bearings. He thought it actually meant anti seize and Lord knows he didn't want his first rebuild to have any problems.......... l:)l:)

I set through a 4 hour bolt torque presentation by Lawson Bolts. Anti seize/ Never Seize does effect bolt torque. In the two brands tested it actually took more torque to achieve the same clamping force. Never seize is not a lubricant. Other brands may have different results.
Now, that's interesting. I attended a presentation by Lawson; this would have been years ago. At that time, the general consensus was to reduce bolt torque by ~20%.

Someday I'm going to just have to break down and start measuring stretch as an experiment.

laughing at the comment about the rebuilder with antisezie..A friend did the same thing, coated his bearings with it. Car lasted all of about a half hour and cam back in the driveway with a spun bearing. :thumbsup:
Some people dont listen.

Now, that's interesting. I attended a presentation by Lawson; this would have been years ago. At that time, the general consensus was to reduce bolt torque by ~20%.

Someday I'm going to just have to break down and start measuring stretch as an experiment.

I don't know that there ever was a general consensus. They made the point that anti seize from brand to brand differ. Their strain gauge showed on what ever particular brand of anti seize they used that the clamping force was down for the same torque. They stressed not using ANY anti seize on ANY critical fastener.