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Actual serious question

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zsmith3rd(at)earthlink.ne
Guest

Posted: Wed Mar 22, 2006 12:05 pm Post subject: Actual serious question

List,



A friend asked as to the maximum number of washers on an AN bolt.

Since I'm at the office, no printed references at hand, here goes.....



My rememberance of the requirements:  two maximum

He thinks it is three washers maximum.



So here is the real question:  It that ON EACH END?  (This would end up being FOUR in the one case, two under the head, two under the nut) or  (SIX in the other case......three under the head, three under the nut).



As I understand his needs, he desires a washer under the head.  He also needs to put two under the nut so that the Castle nut is in the correct place for the Cotter pin.  Grip length, he says, is correct.



Anybody want to rivet this one to the wall?



Thanks,



Zed/701/R912/90+%/Thanks, Guys/do not archive

frank.hinde(at)hp.com
Guest

Posted: Wed Mar 22, 2006 12:40 pm Post subject: Actual serious question

In theory its zero washers under the head and two on the other end.



Having said that, if it is a super critical structural point like a wing

spar then I would adhere to this rule...If a few of the others required

an additional washer under the head it is unlikely the inspector would

have a problem and I certainly wouldn't.



Frank...People keep calling me about my HDS for sale...I feeel very

sad!..



 



--

nfivesl(at)yahoo.com
Guest

Posted: Wed Mar 22, 2006 1:13 pm Post subject: Actual serious question

A serious answer from EAA sport Aviation, March, 1998:



Basics of Bolt Installation

Certain accepted practices prevail concerning the

installation of hardware. A few of these regarding

bolt installation follow:



      a. In determining proper bolt lengthno more

than 1 thread should be hidden inside the bolt hole.



      b. Whenever possible, bolts should be installed

pointing aft and to the center of an airplane.



      c. Use a torque wrench whenever possible &

determine torque values based on the size of bolt.



      d. Be sure bolt and nut threads are clean and

dry.



      e. Use smooth, even pulls when tightening.



      f. Tighten the nut firstwhenever possible.



      g. A typical installation includes a bolt, 1

washer, and a nut.



      h. If the bolt is too long, a maximum of 3

washers may be used.



      i. If more than 3 threads are protruding from

the nut, the bolt may be too long and could be

bottoming out on the shank.



      j. Use undrilled bolts with fiber lock nuts. If

you use a drilled bolt and fiber nut combination, be

sure no burrs exist on the drilled hole that will cut

the fiber.



      k. If the bolt does not fit snug, consider the

use of a close tolerance bolt.



      l. Dont make a practice of cutting off a bolt

that is too long to fit a hole. That can often weaken

the bolt and allow corrosion in the area that is cut.

--- Zed Smith <zsmith3rd(at)earthlink.net> wrote:



 	  Quote: 	
		   

 <zsmith3rd(at)earthlink.net>

 

 List,

 

 A friend asked as to the maximum number of washers

 on an AN bolt.

 Since I'm at the office, no printed references at

 hand, here goes.....

moorecomp(at)yahoo.com
Guest

Posted: Wed Mar 22, 2006 1:14 pm Post subject: Actual serious question

Zed,



 	  Quote: 	
		  From the 43-13,


	


7-37. GRIP LENGTH. In general, bolt grip

lengths of a fastener is the thickness of the

material the fastener is designed to hold when

two or more parts are being assembled. Bolts

of slightly greater grip length may be used,

provided washers are placed under the nut or

bolthead. The maximum combined height of

washers that should be used is 1/8 inch. This

limits the use of washers necessary to compensate

for grip, up to the next standard grip size.

Over the years, some fasteners specifications

have been changed. For this reason, it is recommended

when making repairs to an aircraft,

whose original hardware is being replaced, that

you must first measure the bolt before ordering,

rather than relying on the parts manual for

identification. In the case of plate nuts, if

proper bolt grip length is not available, add

shims under the plate. All bolt installations

which involve self-locking or plain nuts should

have at least one thread of the bolt protruding

through the nut.

Craig Moore A&P

701 builder wannabe

--- Zed Smith <zsmith3rd(at)earthlink.net> wrote:



 	  Quote: 	
		   

 <zsmith3rd(at)earthlink.net>

 

 List,

 

 A friend asked as to the maximum number of washers

 on an AN bolt.

 Since I'm at the office, no printed references at

 hand, here goes.....

 

 My rememberance of the requirements:  two maximum

 He thinks it is three washers maximum.

 

 So here is the real question:  It that ON EACH END? 

 (This would end up being FOUR in the one case, two

 under the head, two under the nut) or  (SIX in the

 other case......three under the head, three under

 the nut).

 

 As I understand his needs, he desires a washer under

 the head.  He also needs to put two under the nut so

 that the Castle nut is in the correct place for the

 Cotter pin.  Grip length, he says, is correct.

 

 Anybody want to rivet this one to the wall?

 

 Thanks,

 

 Zed/701/R912/90+%/Thanks, Guys/ do not archive

n4546v(at)mindspring.com
Guest

Posted: Wed Mar 22, 2006 2:03 pm Post subject: Actual serious question

Hello Listers:

    I am glad frivolity and fun has been shut down on this list and we are

getting back to strictly serious questions.

Now:  I am using a pneumatic rivet gun for setting the A4 rivets, what color

socks should I be wearing for this operation?



Apoligeticly yours,



Randy L. Thwing, Las Vegas

do not archive

mike.sinclair(at)ATT.NET
Guest

Posted: Wed Mar 22, 2006 2:15 pm Post subject: Actual serious question

Green?



"Randy L. Thwing" wrote:



 	  Quote: 	
		   



 Hello Listers:

     I am glad frivolity and fun has been shut down on this list and we are

 getting back to strictly serious questions.

 Now:  I am using a pneumatic rivet gun for setting the A4 rivets, what color

 socks should I be wearing for this operation?



 Apoligeticly yours,



 Randy L. Thwing, Las Vegas

 do not archive

hewettproperties(at)cox.n
Guest

Posted: Wed Mar 22, 2006 3:19 pm Post subject: Actual serious question

Just don't wear white or they'll clash with your "wing tips".  Only the

over 40 crowd will have a clue.



Love the website.

 	  Quote: 	
		  From the sidelines

Tim Hewett, Council Bluffs IA
	




--

n801bh(at)netzero.com
Guest

Posted: Wed Mar 22, 2006 4:41 pm Post subject: Actual serious question

Hello Listers:

    I am glad frivolity and fun has been shut down on this list and we are

getting back to strictly serious questions.

Now:  I am using a pneumatic rivet gun for setting the A4 rivets, what color

socks should I be wearing for this operation?



Apoligeticly yours,



Randy L. Thwing, Las Vegas

do not archive



///////////////////////////////////////////////////////////////////////////////////////

 

Don't wear socks while riveting. Duct tape GREEN scotchbrite to your ankles and wrap them around your toes. That way you get a pedicure at the same time you are setting those un-tested A-4 rivets. <G>

Definately do not archive......

Ben Haas

N801BH

www.haaspowerair.com



Hello Listers:

 I am glad frivolity and fun has been shut down on this list and we are

getting back to strictly serious questions.

Now: I am using a pneumatic rivet gun for setting the A4 rivets, what color

socks should I be wearing for this operation?



Apoligeticly yours,



Randy L. Thwing, Las Vegas

do not archive



///////////////////////////////////////////////////////////////////////////////////////



Don't wear socks while riveting. Duct tape GREEN scotchbrite to your ankles and wrap them around your toes. That way you get a pedicure at the same time you aresetting those un-tested A-4 rivets. G





Definately do not archive......

BenHaas

N801BH

www.haaspowerair.com

daberti(at)sbcglobal.net
Guest

Posted: Wed Mar 22, 2006 7:59 pm Post subject: Actual serious question

Preferably contrasting to the scotch-brite pads.  See Martha Stewarts

website for further color coordination ideas to your interior upholstery and

paint scheme.



--

shaun-s(at)sbcglobal.net
Guest

Posted: Wed Mar 22, 2006 9:50 pm Post subject: Actual serious question

take me off your list



Dave <daberti(at)sbcglobal.net> wrote:  



Preferably contrasting to the scotch-brite pads. See Martha Stewarts

website for further color coordination ideas to your interior upholstery and

paint scheme.



--

Tommy Walker

Joined: 12 Jan 2006
Posts: 442
Location: Anniston, AL 36207

Posted: Thu Mar 23, 2006 5:50 am Post subject: Actual serious question

<List, A friend asked as to the maximum number of washers on an AN bolt.

Since I'm at the office, no printed references at hand, here goes..... My

rememberance of the requirements: two maximum He thinks it is three washers

maximum. 



Zed,



I think, the washer sequence goes:



1 washer under the nut

2 washers under the nut

3=2 washers under the nut, one under the bolt head.



Tommy Walker in Alabama

Do Not Archive

_________________
Tommy Walker
N25A - Anniston, AL

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