Is there a definitive source of information/instruction on torque striping

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bushy's picture
Is there a definitive source of information/instruction on torque striping

Is there a definitive source of information/instruction on torque striping that gives the pros and cons, techniques, dangers, failures and limitations of this process please. Everyone seems to have their ideas but where are the Facts!

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john.schwaner's picture

I know of no ASTM, ISO, or MIL_SPEC process specification-- not to say that there might not be one somewhere.

We have used the product as a low-tech, somewhat insecure method to detect product tampering for over 50 years.

Description of product from manufacturer, Organic Products.

F-900 "TORQUE SEAL" An inexpensive method to detect warranty tampering; and vibration loosening. Used in production on compression fittings, studs, nuts, parts, and assemblies after they are in proper torque or position. Widely used as "Anti-Sabotage Lacquer". Inspectors can visually detect any movement or tampering; Torque Seal becomes brittle and will crack.

John Janiszewski
John Janiszewski's picture

I typically coat the threads of the bolt then tighten until it oozes out. Once it tries it hold well. Just kidding of course :)

No, but seriously..

I used stuff called anti-sabotage lacquer which I always thought was a funny name. Are we really worried about sabotage? Somebody sneaking around loosing hardware?

Another time while I was applying the "anti-sabotage lacquer", a fellow mechanic looked at me and said, oh, only the inspector is supposed to apply that". Probably had something to do with the fact I was on a army contract so common sense was not so common.

Another tip I learned that if the hardware is not cleaned properly, and you are applying the lacquer to a tail rotor drive shaft, it magically disappears after a ground run.

Oh and one more thing. I always get it all over me some how because 5 minutes after applying it, I forget about it and put my sleeve smack dab all over the hardware. I get nervous that people will start thinking im sabotaging aircraft because I'm covered in orange lacquer

Anonymous (not verified)
Anonymous's picture

I am also amused by the "anti sabotage" nomenclature.

As if the product is controlled, or only available to known non saboteurs. Anybody can get it,

Rich Slater (not verified)
Anonymous's picture

Continental requires it at engine O/H on certain bolts and nuts. Check SIL99-2B, dated 2005-10-20

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