No 8 nut wrench size.

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

PTAirco

Well-Known Member
Joined
Sep 20, 2003
Messages
3,509
Location
Corona CA
Ok, I confess something: I have no idea what size wrench fits on a No8 nut. Yes, yes, I know, stop laughing. But seriously - no socket or wrench (imperial) among the hundreds I have lying around fits a No8 nut. For decades I have always resorted to a 9mm . It's not 11/32" (big)and it's not 5/16" (small) . There is no consensus on this on the interwebs. Wrench sizes suggested vary from 1/4" to 3/8". I have plenty of 9mm sized sockets and wrenches plus a few I custom ground to fit. But what is the proper size? 21/64"??
 

nerobro

Well-Known Member
Log Member
Joined
Nov 6, 2011
Messages
1,111
Location
Northern Illinois
The sad answer, is that there "is no answer" You can order all sorts of "across the flats" sizes for various thread sizes. You can also order different nut thicknesses.

You'll need to guess and check.

Alternatively, the part you're trying to mess with, has an abused fastener, and you're just going to need to get something adjustable on it.
 

Dana

Super Moderator
Staff member
Joined
Apr 3, 2007
Messages
8,979
Location
CT, USA
Well, the MS20144 spec says an 8-32 nut is .336-.345 across the flats, so I'd say 11/32 (.344). But there are lots of non standard nuts out there, too.

Dana
 

Rockiedog2

Well-Known Member
Joined
Dec 11, 2012
Messages
2,319
I've been using 11/32 forever it's not a perfect fit but it's as close as a 3/8 on a #10 nut with my wrenches. a tiny bit of slop. I never gave it any thought; I just thought it was a given.
 

Eagle

Well-Known Member
Joined
Aug 31, 2015
Messages
83
Location
Good ole Usa
A box of #8 nuts I have measures about .336 and 11/32 is .3438 so an 11/32s wrench fits these perfectly.

I'm reasonably sure that you can get nuts that vary in external dimensions from different manufacturers.

I have been known to take a smaller wrench on occasion and file it to size to meet a special need.

DSCN4656.jpg
 

Dan Thomas

Well-Known Member
Joined
Sep 17, 2008
Messages
5,094
#8 nuts take an 11/32" wrench. Now, you need a decent wrench, too, since so many tools are made in countries that don't care too much for accuracy. When you get that small, a couple of thou can make a big difference in fit.
 

Daleandee

Well-Known Member
Joined
Sep 11, 2015
Messages
954
Location
SC
Ok, I confess something: I have no idea what size wrench fits on a No8 nut. Yes, yes, I know, stop laughing. But seriously - no socket or wrench (imperial) among the hundreds I have lying around fits a No8 nut. For decades I have always resorted to a 9mm.
Try an 8.5mm if you have such a thing, especially if the nut has some wear on it.

I have 4.5, 5.5, & 6.5 mm but no 8.5. Don't know how difficult it would be to find one to try. Like you, and most every one else, I grab all the ones that should fit and see what works at the time. Dan made an excellent point about being sure you have a quality tool.

Dale
N319WF
 

Victor Bravo

Well-Known Member
Joined
Jul 30, 2014
Messages
6,785
Location
KWHP, Los Angeles CA, USA
I always used 8/32 too... there has to be some gap or clearance so you can slide the wrench on under less than ideal conditions.

There is also the politically incorrect but completely technically valid issue of... wrench origin.
 

PTAirco

Well-Known Member
Joined
Sep 20, 2003
Messages
3,509
Location
Corona CA
Hm, i just got a batch of 8/32s from Aircraft Spruce and 11/32" fits just fine. I had a huge stock of older ones and they must have been something of an oddity, because these newer ones work fine with 11/32".
 

Pops

Well-Known Member
Log Member
Joined
Jan 1, 2013
Messages
7,701
Location
USA.
Ah, Ah.--- The all purpose adjustable metric wrench. Heck , I can't say that, metric now means "measurement". Wouldn't want to hurt someone's feeling when they are out of their safe space.



Dan


Yes, metric instead of "measurement", It sounds so European, has to be better. Same for using "tarmac" instead of ramp. Did you ever ask to taxie to the "tarmac" ? TARMAC - Airport Apron Area

Using these terms makes it easy to guess the users age.
 
2
Group Builder
Top