Using self locking nuts on drilled shank bolts
- Thread starter sdischer
- Start date
mike mcs repair
Registered User
chugiak AK
Doesn’t bother me as long as not a rotating joint.
But much more expensive bolt than undrilled bolt.
I stock both in good quantities finally.
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COLLEGE STATION, TX
Shear.
I just ordered the wrong boltS and I don’t want to wait three more days for them to come in LOL
Charlie Longley
MEMBER
Anchorage, AK
No issue at all using self locking nuts on a drilled bolt.
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
So long as the drilled hole is not in the grip portion of the nut. 43.13 as something on this, that is more exactly stated.
Charlie Longley
MEMBER
Anchorage, AK
Can you point to the exact section of AC43.13 that states this Gordon?
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
Well, I may have egg on my face. I can't seem to find a pertinent reference. I know I've read that stipulation somewhere - maybe not 43.13. Seems section 7-34 and following sections would apply. Anybody able to help clarify this?
Charlie Longley
MEMBER
Anchorage, AK
Yeah I can clarify it. It’s standard practice to use a bolt with a drilled shank and a self locking nut if a bolt without a drilled shank isn’t available. As Mike pointed out it’s slightly more expensive. But it moves things along.
Charlie
A&P/IA
Last edited:
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
Agree. How can it possibly be wrong? But it still bugs me to find an official reference. Arlington and Toledo aren't that terribly distant - we should touch base one of these days.
skywagon8a
MEMBER
SE Mass MA6
"Here is another reminder about self-locking fiber nuts (reminders are sort of rules, too). Do not make a habit of using a self-locking fiber insert type of nut on a drilled bolt smaller than 5/16" in diameter. If you do use a drilled bolt, be sure that there are no burrs around the cotter pin hole that could tear into the elastic insert. Maybe they make too much of this rule but then again, who wants to drive around with slashed tires even if they do hold air?"
http://dad.walterfamily.org/rv/TonyBingelis/Are%20You%20Using%20Aircraft%20Hardware%20Correctly_.html
S2D
MEMBER
Montana
Charlie Longley
MEMBER
Anchorage, AK
I think we were both at the aviation trade show in Puyallup a few years ago. I ran into Eric there but didn’t see you. Stop by my hangar in Arlington sometime and check out my project. I am right next to the Castle & Cooke gas pump.
Steve Pierce
BENEFACTOR
Graham, TX
Piper did it when they moved from castle nuts to self locking nuts. After seeing some bolts in tension fail at the cotter pin hole I make sure I don't do it.
skywagon8a
MEMBER
SE Mass MA6
I too have seen that, but generally consider the bolt was too short for the application. As long as the cotter pin hole is outside of the threads of the nut even though inside the elastic stop, the bolt should not break.
Steve Pierce
BENEFACTOR
Graham, TX
I don't remember the application, many years ago on a warbird. I have a good collection of hardware so try and use the corresponding bolt to match the nut.
Charlie Longley
MEMBER
Anchorage, AK
Yeah I have a pretty good collection of hardware too. When I run across it I’ll try and change the hardware cause it hurts my eyes.
Steve Pierce
BENEFACTOR
Graham, TX
mike mcs repair
Registered User
chugiak AK
does not look like a nylock to me.......
