Hi, Phil,

Putting paint on the screwdriver tip won't prove a thing except that the
screwdriver tip has been inserted into the screw head (or not). It's no
guarantee that the screw has been torqued. We always used to use that
lovely purple locking varnish, applied from the crown of the screw head,
down one side of the head and onto the mating surface by an mm or 2. Again
no guarantee that a screw has been torqued, but it helps to retain the
screw in place. A little more visible and less fiddly than painting your
screwdriver tip. You'll clog up your driver and not get a very consistent
paint transfer to the screw.

I believe the locking varnish is resistant to most chemicals, including
hydraulic oil. Not very quick-curing, though. Nail polish would probably do
as well - and you can get some pretty garish colours these days, so they
should show up nicely.

Peter



Phil Nutting <[log in to unmask]> 28/12/2002 02:30 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Phil Nutting

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] marking torques screws








Hi everyone,

Do any of you have experience with marking screws that have been torqued?
We are thinking that there should be some "paint" on the screw driver tip
when it is inserted into the head so when completely torqued it can be
identified.  Just painting on some paint after the fact can let a loose
screw through inspection.

Just to make the whole project harder we need a material that will not
dissolve in Shell Diala AX transformer oil. Also long pot life, but quick
cure once applied would be good.  I know, that would be a good trick.

One thought was simply using finger nail polish.

What are your thoughts?

Thanks,

Phil Nutting

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