Screws: Number Of Turns Engagement For Full Strength?

[(PeteCresswell)]

M5, .80 pitch screw connects into a barrel-shaped piece.

Full engagement is 7 or 8 turns.

Anybody know how many turns are required for full strength?
(i.e. how far can I back it out without risk?).
--
PeteCresswell

[jim beam]

Jambo wrote:
> "jim beam" <spamvortex@bad.example.net> wrote in message
> news:g5KdnTNKv9bpUn_bnZ2dnUVZ_u_inZ2d@speakeasy.ne t...
>> need more info - barrel-shaped piece of /what/? in what application?
>
> As if you'd know, ****tard.

oh dear, mr. modulus is back. won any boeing materials contracts lately?

[A Muzi]

> "jim beam" <spamvortex@bad.example.net> wrote
>> need more info - barrel-shaped piece of /what/? in what application?

Jambo wrote:
> As if you'd know, ****tard.

Without regard to the merits I have never seen nor heard that word
outside r.b.t.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

[jim beam]

(PeteCresswell) wrote:
> M5, .80 pitch screw connects into a barrel-shaped piece.
>
> Full engagement is 7 or 8 turns.
>
> Anybody know how many turns are required for full strength?
> (i.e. how far can I back it out without risk?).

need more info - barrel-shaped piece of /what/? in what application?

[Chalo]

PeteCresswell wrote:
>
> M5, .80 pitch screw connects into a barrel-shaped piece.
>
> Full engagement is 7 or 8 turns.
>
> Anybody know how many turns are required for full strength?

Full axial load on a fastener can be carried by three threads,
usually. But the three threads on the tip of a screw are not usually
uniform enough to be the three that can do this. Throw any bending
load into the mix, even small, and you'll need more threads engaged,
just so that your critical three don't get damaged as you torque the
fastener. (Sounds like the "barrel shaped piece" is a special nut
designed to keep excessive bending loads off of the screw in a pinch
clamp application. Friction between barrel and bore will still leave
you with some bending load on the screw, so grease the cylindrical
surface if you can.)

> (i.e. how far can I back it out without risk?).

I'd look for 5 threads of engagement. Better yet, I'd look for a
longer screw. M5x0.8 isn't exactly rare or difficult to find. Is it
a special spherical-headed screw or something?

Chalo

[Jambo]

"jim beam" <spamvortex@bad.example.net> wrote in message
news:g5KdnTNKv9bpUn_bnZ2dnUVZ_u_inZ2d@speakeasy.ne t...
>
> need more info - barrel-shaped piece of /what/? in what application?

As if you'd know, ****tard.

[(PeteCresswell)]

Per Chalo:
>I'd look for 5 threads of engagement. Better yet, I'd look for a
>longer screw. M5x0.8 isn't exactly rare or difficult to find. Is it
>a special spherical-headed screw or something?

Nothing special. M5x0.8 socket head @50mm.

Definitely gonna go the right-length route.

Tried the local hardware... then tried Lowe's...

Was about to turn off to try Home Depot and a little voice
whispered "You dummy!!!! This is a textbook case for buying via
somebody's web page."

Prolly dropped 2 man hours and 50 vehicle miles into it.

--
PeteCresswell

[carlfogel@comcast.net]

On Sat, 08 Sep 2007 13:42:59 -0500, A Muzi <am@yellowjersey.org>
wrote:

>> "jim beam" <spamvortex@bad.example.net> wrote
>>> need more info - barrel-shaped piece of /what/? in what application?
>
>Jambo wrote:
>> As if you'd know, ****tard.
>
>Without regard to the merits I have never seen nor heard that word
>outside r.b.t.

Dear Andrew,

I had not suspected that a local bike shop owner might lead a life
even more sheltered than mine:

http://www.google.com/search?as_q=****tard&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=images

In contrast to such tiresome snarling, the most original vituperation
that I've seen lately was in Susan Wenger's parody of O'Brian's
Aubrey-Maturin Royal Navy novels, where Wenger out-did O'Brian's
frequently masterful insults ("Incest is nothing to them!") in a
passage exaggerating O'Brian's stock scene about the foul sailor's
language picked up by Captain Aubrey's innocent little twin daughters:

"Mama," screeched Carlotta, her wet hair streaming down her chubby
cheeks, "That goddamned bosun's hemorrhoid Fancy has took my goddamned
toy boat!"

--"The Port-Wine Sea," p. 39

For more delicate souls, Wenger includes several puns so awful that
even O'Brian dared not put them in Aubrey's mouth.

Cheers,

Carl Fogel

[Hank Wirtz]

On Sep 8, 11:42 am, A Muzi <a...@yellowjersey.org> wrote:
> > "jim beam" <spamvor...@bad.example.net> wrote
> >> need more info - barrel-shaped piece of /what/? in what application?
> Jambo wrote:
> > As if you'd know, ****tard.
>
> Without regard to the merits I have never seen nor heard that word
> outside r.b.t.

Seriously? My buddies and I used to call each other that all the time
back in college, which seems to coincide with its first appearance on
usenet in 1994, but in alt.music.alternative, not R.B.T.

[andresmuro@aol.com]

On Sep 8, 12:42 pm, A Muzi <a...@yellowjersey.org> wrote:
> > "jim beam" <spamvor...@bad.example.net> wrote
> >> need more info - barrel-shaped piece of /what/? in what application?
> Jambo wrote:
> > As if you'd know, ****tard.
>
> Without regard to the merits I have never seen nor heard that word
> outside r.b.t.
> --
> Andrew Muziwww.yellowjersey.org
> Open every day since 1 April, 1971

That is one that I've heard from my son about a year ago. I thought
that was a pretty funny insult and congratulated him for his
creativity, and so did my wife. Then, my step daughter informed me
that it was a k-12 standard now.

Andres

[Chalo]

PeteCresswell wrote:
>
> Was about to turn off to try Home Depot and a little voice
> whispered "You dummy!!!! This is a textbook case for buying via
> somebody's web page."
>
> Prolly dropped 2 man hours and 50 vehicle miles into it.

When all else fails, or if you just can't be bothered to look in more
than one place:

http://www.mcmaster.com

Chalo

[jim beam]

carlfogel@comcast.net wrote:
> On Sat, 08 Sep 2007 13:42:59 -0500, A Muzi <am@yellowjersey.org>
> wrote:
>
>>> "jim beam" <spamvortex@bad.example.net> wrote
>>>> need more info - barrel-shaped piece of /what/? in what application?
>> Jambo wrote:
>>> As if you'd know, ****tard.
>> Without regard to the merits I have never seen nor heard that word
>> outside r.b.t.
>
> Dear Andrew,
>
> I had not suspected that a local bike shop owner might lead a life
> even more sheltered than mine:
>
> http://www.google.com/search?as_q=****tard&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=images
>
> In contrast to such tiresome snarling, the most original vituperation
> that I've seen lately was in Susan Wenger's parody of O'Brian's
> Aubrey-Maturin Royal Navy novels, where Wenger out-did O'Brian's
> frequently masterful insults ("Incest is nothing to them!") in a
> passage exaggerating O'Brian's stock scene about the foul sailor's
> language picked up by Captain Aubrey's innocent little twin daughters:
>
> "Mama," screeched Carlotta, her wet hair streaming down her chubby
> cheeks, "That goddamned bosun's hemorrhoid Fancy has took my goddamned
> toy boat!"

p.o.t.m!!!!


>
> --"The Port-Wine Sea," p. 39
>
> For more delicate souls, Wenger includes several puns so awful that
> even O'Brian dared not put them in Aubrey's mouth.
>
> Cheers,
>
> Carl Fogel

[Michael Press]

In article
<48s5e3hrkrs7j6pf41rftej28rtko6o9cg@4ax.com>,
carlfogel@comcast.net wrote:

> On Sat, 08 Sep 2007 13:42:59 -0500, A Muzi <am@yellowjersey.org>
> wrote:
>
> >> "jim beam" <spamvortex@bad.example.net> wrote
> >>> need more info - barrel-shaped piece of /what/? in what application?
> >
> >Jambo wrote:
> >> As if you'd know, ****tard.
> >
> >Without regard to the merits I have never seen nor heard that word
> >outside r.b.t.
>
> Dear Andrew,
>
> I had not suspected that a local bike shop owner might lead a life
> even more sheltered than mine:
>
> http://www.google.com/search?as_q=****tard&hl=en&num=10&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=images
>
> In contrast to such tiresome snarling, the most original vituperation
> that I've seen lately was in Susan Wenger's parody of O'Brian's
> Aubrey-Maturin Royal Navy novels, where Wenger out-did O'Brian's
> frequently masterful insults ("Incest is nothing to them!") in a
> passage exaggerating O'Brian's stock scene about the foul sailor's
> language picked up by Captain Aubrey's innocent little twin daughters:
>
> "Mama," screeched Carlotta, her wet hair streaming down her chubby
> cheeks, "That goddamned bosun's hemorrhoid Fancy has took my goddamned
> toy boat!"
>
> --"The Port-Wine Sea," p. 39

GD twice in one curse? Please ...

That seeping bosun's hemorrhoid Fancy, the fornicator,
has took me sodding toy boat!

> For more delicate souls, Wenger includes several puns so awful that
> even O'Brian dared not put them in Aubrey's mouth.

Where is Wenger's work? Out did
"Why is it called the dog watch?"

--
Michael Press

[(PeteCresswell)]

Per Chalo:
>When all else fails, or if you just can't be bothered to look in more
>than one place:
>
>http://www.mcmaster.com

Wow!.... Now *that*s a search utility.

Made my 'keepers' list.

Thanks.
--
PeteCresswell

[(PeteCresswell)]

Per Chalo:
>http://www.mcmaster.com

Also - now I know what .80 pitch means.
--
PeteCresswell

[datakoll]

HD has it but a complete True Value has options.
clean screw and housing with thinner follow with CHO, Q-tip applicator
then douse with blue eom 242 loctite from Walmart. The installer can
apply twice, let set once, remove screw, apply again, troque in for
setup. 242 assumes the screw is ferrous.
Tiawanese and Japanese ship (l975-1990) with a blue or green tacky
substance giving excellent holding power but the stuff does absolve
over time and turning. I herd it's made off fish oil?

[* * Chas]

"(PeteCresswell)" <x@y.Invalid> wrote in message
news:kb26e39hq500gfj6n8h6em1469jcutds7a@4ax.com...
> Per Chalo:
> >http://www.mcmaster.com
>
> Also - now I know what .80 pitch means.
> --
> PeteCresswell

In the Metric Thread System, Thread Pitch is the distance from the crest
(top of the V thread form) of one thread to the crest of the next.

..80 pitch is .80mm from thread to thread.

M5 x .8 is a 5mm diameter thread with a pitch of .8mm

In the Unified Thread System currently used for inch size threads, Pitch
is measured in the number of Threads Per Inch (TPI).

To answer your original question, in commercial fasteners the rule of
thumb is that maximum holding strength achieved at 7 threads of
engagement.

This is generally used for fasteners that lock tightly.

Chas.

[Chalo]

* Chas wrote:
>
> To answer your original question, in commercial fasteners the rule of
> thumb is that maximum holding strength achieved at 7 threads of
> engagement.

Hardly any machine nuts contain so many threads. Some, like normal
#10-32 nuts, only have four threads in them.

Chalo

[zencycle]

On Sep 10, 1:06 pm, Chalo <chalo.col...@gmail.com> wrote:
> * Chas wrote:
>
> > To answer your original question, in commercial fasteners the rule of
> > thumb is that maximum holding strength achieved at 7 threads of
> > engagement.
>
> Hardly any machine nuts contain so many threads. Some, like normal
> #10-32 nuts, only have four threads in them.
>
> Chalo

In a previous life, while working in a product development role, I was
lectured that a certain milspec requirement was 5 threads, but the
company had a minimum spec of 3 for the non-mil products. Of course it
was different for nut/bolt applications, since some nuts only have
three threads to begin with.

I love all the screw/nut/bolt ads that load in the right pane in this
thread.

[datakoll]

On Sep 10, 1:06 pm, Chalo <chalo.col...@gmail.com> wrote:
> * Chas wrote:
>
> > To answer your original question, in commercial fasteners the rule of
> > thumb is that maximum holding strength achieved at 7 threads of
> > engagement.
>
> Hardly any machine nuts contain so many threads. Some, like normal
> #10-32 nuts, only have four threads in them.
>
> Chalo

yeah but chas speaks of a bolt standing free in a housing whereas
chalo considers a bolt nut combo fastened either side thru a hard
surface.
housing bolts usually? tapped/died with a high thread percentage that
is less space between male/female allowing the 'free' standing
adjuster bolt less play.
hmmmm flow pattern.

[jobst.brandt@stanfordalumni.org]

Chalo Colina writes:

>> To answer your original question, in commercial fasteners the rule
>> of thumb is that maximum holding strength achieved at 7 threads of
>> engagement.

> Hardly any machine nuts contain so many threads. Some, like normal
> #10-32 nuts, only have four threads in them.

I think you exaggerate. Four threads would make that 10-32 screw an
eighth of an inch long, short screws having threads over their full
length. 4 x 0.03125" = 0.125" the screw major diameter being 0.190".
That four threads fully engaged will suffice, however, is shown by the
size of a matching 10-32 nut. They are nearly identical with an
M5 x 0.8 thread.

Jobst Brandt

[datakoll]

I'm suspicious. If the manufacturer's accounting team figures any part
can be shaved withtort liability, they'll shave. or worser, 20%
liability. and you'd never know until part A fractures and in your
face amacite. locktite.
then there's waterford...
I have heard instruction for replacing shipped fasteners with grade
8's.
the Monodog came in the door: appears solid and useable. dropouts not
up to waterford spec. John Deere. credible.

[Chalo]

jobst.bra...@stanfordalumni.org wrote:
>
> Chalo Colina writes:
> >> To answer your original question, in commercial fasteners the rule
> >> of thumb is that maximum holding strength achieved at 7 threads of
> >> engagement.
> > Hardly any machine nuts contain so many threads. Some, like normal
> > #10-32 nuts, only have four threads in them.
>
> I think you exaggerate. Four threads would make that 10-32 screw an
> eighth of an inch long, short screws having threads over their full
> length. 4 x 0.03125" = 0.125" the screw major diameter being 0.190".
> That four threads fully engaged will suffice, however, is shown by the
> size of a matching 10-32 nut. They are nearly identical with an
> M5 x 0.8 thread.

Standard #10-32 nuts are 3/8" across flats and only 1/8" thick. I
think that thickness is in common with #6-32 and #8-32 nuts as well.
That's four threads. M5 nuts are 8mm across flats and 4mm thick, for
five threads.

Like all finished nuts, they are chamfered slightly at the opening, so
their actual number of thread turns is less than that implied by the
thread pitch and nut length.

Chalo