Wing/ Strut bolts

[TJay 1041]

Are the 1/4 bolts up top and 5/16 bolts down on the bottom just AN bolts or are they some high test shear bolts? Just wondering

[akflyer 1427]

they are AN bolts

[EDMO 1078]

TJay,   Yes, they are AN bolts.

Unless the Kitfox 1 is different than any Kitfox 2, or 3 that I have owned, the lower fitting takes a 3/8" bolt, but maybe mine were modified.  My Kitfox 1 fuselage is hanging up high, so I cant get to it to measure it.   It probably wont matter if yours is 5/16"  - it will be stronger than the 1/4" top strut bolt.   (Which BTW, is also used on the 1700 GW Magnum)   EDMO

Edited 12 Apr 2016 by EDMO

[TJay 1041]

TJay,   Yes, they are AN bolts.

Unless the Kitfox 1 is different than any Kitfox 2, or 3 that I have owned, the lower fitting takes a 3/8" bolt, but maybe mine were modified.  My Kitfox 1 fuselage is hanging up high, so I cant get to it to measure it.   It probably wont matter if yours is 5/16"  - it will be stronger than the 1/4" top strut bolt.   (Which BTW, is also used on the 1700 GW Magnum)   EDMO

I think mine is a 5/16 bolt on the bottom, been so long since I tore it down I cant remember that far back. Does any know what the kitfox 3's and 4's run,

[1avidflyer 1983]

Just looked in my Kitfox 4 manual and it calls out a AN6-11 bolt.  Jim Chuk

[EDMO 1078]

I guess if someone wanted to do the research (Spruce?) to find out whether ONE 5/16 or a 3/8 bolt is equal or greater shear strength than the TWO 1/4" upper strut bolts combined, then they could see how it figures out, or use the TLAR principle, and go with 3/8.    EDMO

Edited 13 Apr 2016 by EDMO

[1avidflyer 1983]

Just grabbed my calculator, and if I remember right, area = Pie X Radius squared.  If that's correct, two 1/4" bolts are .098 square inches, one  5/16" bolt is .076 square inches, and one 3/8" bolt is .110 square inches in area.  Jim Chuk

[EDMO 1078]

Just grabbed my calculator, and if I remember right, area = Pie X Radius squared.  If that's correct, two 1/4" bolts are .098 square inches, one  5/16" bolt is .076 square inches, and one 3/8" bolt is .110 square inches in area.  Jim Chuk

Yeh - TLAR works every time!  "Bigger is Better"!    EDMO

Edited 13 Apr 2016 by EDMO

[Geoffrey Thorpe 31]

AN bolt specs attached.

AN3THRUAN20-REV12.006281.pdf