The Murphy Builders Site

What Wayne is saying is that the torque you read on the torque wrench is composed of the sum of the nylon insert totque and the metal nut / bolt torque. The torque tables only account for the nut / bolt torque (no self locking). Therefore, clamp a bolt lightly in your vise, run a nut on until the bolt just protrudes, and by starting at zero slowly up the torque value set on the wrench until the nut just begins to turn. That is the value the nut alone requires to turn.

Then add that value to the torque value for the bolt from the table and use the resulting sum as the set value on the torque wrench for assembly tightening. Of course, that only is valid for the first time the nut sees the bolt.

All that said, I'm going to bolt out of here before going nuts.
Ralph Baker



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Thanks Terry, Ralph. I have assumed that the torque ratings were meant for
the twist strain limit of the bolt itself, and that adding anything to torque
ratings was improper. (I've twisted bolts to failure in non-aircraft hack
mechanic mode, but cannot recall ever breaking or stripping any nuts, thus,
still surprised to hear about adding torque for the nylock.) I can see that
if torque ratings were meant to limit the squish force of the bolted together
parts, that adding the nylock portion would be the right way to get to that
force. Don't mean to drive this into the ground....
-Ben

On 11/22/2005 11:04 AM, rebaker@sc.rr.com wrote to rebel-builders:

What Wayne is saying is that the torque you read on the torque wrench is

composed of the sum of the nylon insert totque and the metal nut / bolt
torque. The torque tables only account for the nut / bolt torque (no self
locking). Therefore, clamp a bolt lightly in your vise, run a nut on until
the bolt just protrudes, and by starting at zero slowly up the torque value
set on the wrench until the nut just begins to turn. That is the value the
nut alone requires to turn.

Then add that value to the torque value for the bolt from the table and use

the resulting sum as the set value on the torque wrench for assembly
tightening. Of course, that only is valid for the first time the nut sees
the bolt.

All that said, I'm going to bolt out of here before going nuts.
Ralph Baker

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A torque rating generally is there for bolt stretch and so you don't exceed
it.....not thread stripping...although that is a great possiblity as well.
The torque required to turn the nytrol is pretty much insignificant anyhow
at less then 2 ft-lbs usually.

----- Original Message -----
From: <bransom@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, November 22, 2005 7:39 PM
Subject: RE: nyloc nut torques

Thanks Terry, Ralph. I have assumed that the torque ratings were meant

for

the twist strain limit of the bolt itself, and that adding anything to

torque

ratings was improper. (I've twisted bolts to failure in non-aircraft hack
mechanic mode, but cannot recall ever breaking or stripping any nuts,

thus,

still surprised to hear about adding torque for the nylock.) I can see

that

if torque ratings were meant to limit the squish force of the bolted

together

parts, that adding the nylock portion would be the right way to get to

that

force. Don't mean to drive this into the ground....
-Ben

On 11/22/2005 11:04 AM, rebaker@sc.rr.com wrote to rebel-builders:

What Wayne is saying is that the torque you read on the torque wrench is

composed of the sum of the nylon insert totque and the metal nut / bolt
torque. The torque tables only account for the nut / bolt torque (no self
locking). Therefore, clamp a bolt lightly in your vise, run a nut on

until

the bolt just protrudes, and by starting at zero slowly up the torque

value

set on the wrench until the nut just begins to turn. That is the value

the

nut alone requires to turn.

Then add that value to the torque value for the bolt from the table and

use

the resulting sum as the set value on the torque wrench for assembly
tightening. Of course, that only is valid for the first time the nut sees
the bolt.

All that said, I'm going to bolt out of here before going nuts.
Ralph Baker

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I have been just using the high end of the range shown on charts. I am
always installing nuts and bolts with some sort of goop (proseal, epoxy
primer, or anti seize) and I don't believe the charts account for this. I
have to admit to the occasional extra tweak on a nut here and there as well.
Jesse

From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
Reply-To: <rebel-builders@dcsol.com>
To: <rebel-builders@dcsol.com>
Subject: Re: nyloc nut torques
Date: Tue, 22 Nov 2005 19:46:44 -0500

A torque rating generally is there for bolt stretch and so you don't exceed
it.....not thread stripping...although that is a great possiblity as well.
The torque required to turn the nytrol is pretty much insignificant anyhow
at less then 2 ft-lbs usually.

----- Original Message -----
From: <bransom@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, November 22, 2005 7:39 PM
Subject: RE: nyloc nut torques

Thanks Terry, Ralph. I have assumed that the torque ratings were meant

for

the twist strain limit of the bolt itself, and that adding anything to

torque

ratings was improper. (I've twisted bolts to failure in non-aircraft

hack

mechanic mode, but cannot recall ever breaking or stripping any nuts,

thus,

still surprised to hear about adding torque for the nylock.) I can see

that

if torque ratings were meant to limit the squish force of the bolted

together

parts, that adding the nylock portion would be the right way to get to

that

force. Don't mean to drive this into the ground....
-Ben

On 11/22/2005 11:04 AM, rebaker@sc.rr.com wrote to rebel-builders:

What Wayne is saying is that the torque you read on the torque wrench

is

composed of the sum of the nylon insert totque and the metal nut / bolt
torque. The torque tables only account for the nut / bolt torque (no

self

locking). Therefore, clamp a bolt lightly in your vise, run a nut on

until

the bolt just protrudes, and by starting at zero slowly up the torque

value

set on the wrench until the nut just begins to turn. That is the value

the

nut alone requires to turn.

Then add that value to the torque value for the bolt from the table

and
use

the resulting sum as the set value on the torque wrench for assembly
tightening. Of course, that only is valid for the first time the nut

sees

the bolt.

All that said, I'm going to bolt out of here before going nuts.
Ralph Baker

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