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04-30-2012, 11:04 AM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Need definite answer on wing bolt torque.
Looking for a final answer on wing bolt torque. I've read many thread and even called vans and the answers are all over the map. Do I use the AN torque values or the NAS bolt values (much higher). So far I have torqued half my 7/16 bolts to the Nas value if 520 to 630 in lbs. the AN value is 450 to 500 I think. Problem?
Which is correct?
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Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
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04-30-2012, 11:21 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,247
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I'd say that the definitive answer would come from Van's....what did they tell you?
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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04-30-2012, 11:31 AM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Quote:
Originally Posted by Ironflight
I'd say that the definitive answer would come from Van's....what did they tell you?
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They said they just torque to the AN bolt spec, but they were unaware of the NAS bolt torque values being different
__________________
Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
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04-30-2012, 12:17 PM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Quote:
Originally Posted by flyenforfun
They said they just torque to the AN bolt spec, but they were unaware of the NAS bolt torque values being different
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Now I fear I have over torqued. Should I back off and retorque to an specs or leave as is.
__________________
Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
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04-30-2012, 12:31 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by flyenforfun
Now I fear I have over torqued. Should I back off and retorque to an specs or leave as is.
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If they are NAS bolts leave them alone....
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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04-30-2012, 12:37 PM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Quote:
Originally Posted by az_gila
If they are NAS bolts leave them alone....
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They are the NAS Wing bolts torqued to NAS spec of 520 to 630 inch lbs. so torque plus run on torque of the nut I did 600 in lbs, or 50 ft lbs.
Why do I feel like I am the only builder in the world who does some of the things I do. Someone always knows something I don't.
__________________
Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
Last edited by flyenforfun : 04-30-2012 at 12:41 PM.
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04-30-2012, 12:45 PM
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Join Date: May 2005
Location: Rochester Hills, MI
Posts: 878
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Quote:
Originally Posted by flyenforfun
Why do I feel like I am the only builder in the world who does some of the things I do. Someone always knows something I don't.
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'cause you weren't hanging around my shop when I felt that way 
__________________
Dennis Glaeser CFII
Rochester Hills, MI
RV-7A - Eggenfellner H6, GRT Sport ES, EIS4000, 300XL, SL30, TT Gemini, PMA6000, AK950L, GT320,
uAvionixEcho ADSB in/out with GRT Safe Fly GPS
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04-30-2012, 01:07 PM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Quote:
Originally Posted by DGlaeser
'cause you weren't hanging around my shop when I felt that way |
Well now I feel a little better.
What are your wing bolts torqued to?
__________________
Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
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04-30-2012, 02:30 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Am I correct in thinking that these bolts are loaded almost exclusively in shear, so the torque might not be as critical as it would be for a bolt in tension (like a connecting rod bolt), thus Van's recommendation that standard AN torque is adequate?
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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04-30-2012, 04:39 PM
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Join Date: Aug 2009
Location: Wilmington DE
Posts: 323
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Quote:
Originally Posted by flyenforfun
Well now I feel a little better.
What are your wing bolts torqued to?
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Tell me this, torquing experts. Those of you who torqued any bolts from the head, did you incorporate the torque it takes to turn the bolt in the hole? I just measured 25 ft lbs to just turn the bolt in the hole, no nut. Does this mean when vans told me to torque to 40 ft lbs, head or nut, I am under torquing by 25 ft lbs?
__________________
Matt Giordano Sr. and Jr.
RV-8 - N861MM
Wilmington, DE
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