Marking on Bolt
Marking on Bolt
(OP)
Hi,
We need to manufacture a custom bolt and also we need to mark the part number on it. Previously we were etching the part number on the bolt shank. But analysis & testing showed that etching reduced the fatigue life of the bolt. The bolt has a very thin shank. Laser marking is not an alternative as the cost of marking will be very high.
Is there any cost effective marking methods?
Example of part marking "5555-0123".
Please advice.
Attached is bolt drawing
We need to manufacture a custom bolt and also we need to mark the part number on it. Previously we were etching the part number on the bolt shank. But analysis & testing showed that etching reduced the fatigue life of the bolt. The bolt has a very thin shank. Laser marking is not an alternative as the cost of marking will be very high.
Is there any cost effective marking methods?
Example of part marking "5555-0123".
Please advice.
Attached is bolt drawing





RE: Marking on Bolt
wire locking a tag ?
RE: Marking on Bolt
(b) If the Administrator finds that a part is too small or that it is otherwise impractical to mark a part with any of the information required by paragraph (a) of this section, a tag attached to the part or its container must include the information that could not be marked on the part. If the marking required by paragraph (a)(4) of this section is so extensive that to mark it on a tag is impractical, the tag attached to the part or the container may refer to a specific readily available manual or catalog for part eligibility information.
RE: Marking on Bolt
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RE: Marking on Bolt
Having the mark on the shank might protect it or might damage it on insertion/removal or vibration in service. Are you sure it's ok to obscure it in this way?
Our titanium nacelle primary structure parts used to be electro-etched without compromising their fatigue life.
PS: that *is* a small shank!
RE: Marking on Bolt
TTFN
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RE: Marking on Bolt
Regards, Wil Taylor
RE: Marking on Bolt
For fatigue sensitive parts, airgrit marking and laser bonding are suitable methods.
Airgrit still leaves an impression onto the part, although it is not deep and the radii are high, thus making the mark less of a stress raiser.
Laser bonding leaves the part virtually as it is. It shall not change its fatigue properties. It consists of a ceramic label cured by laser onto the surface of the part.
RE: Marking on Bolt
RE: Marking on Bolt
Mark the head with a colored dot. In whatever parts breakdown, bulletin, maintenance instructions can refer to this dot. 'Ensure that bolt is replaced with colored head. If no marking is visisble, discard and replace'
Reading the 1st couple of lines, laser etching popped into my head. But then I read the cost effectiveness part. I think this would be the cheapest solution....
RE: Marking on Bolt
You could try a single stamped dot, then painted (colour coded). The indentation will hold the paint and it will then not wear off. I have seen these on hex head and socket head cap screws and bolts.
RE: Marking on Bolt
when parts are to small or not economically feasible
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