Warbird Information Exchange

Hello all,

I am in the process of assembling the NA-64's fuel control gear box assembly (Same as AT-6 Part #36-48016) and also the two flap control gear boxes. The gears are attached to the shafts by a steel pin that is peened on both ends. The assembly drawings show that the pin is made from 1/8" Steel Drill Rod, Material Spec 57-108. I have done a search on the web for that material spec and nothing is showing up unless it is a North American specific material number.

Any insight would be great.

Patrick

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Warbirds of Glory Museum
North American B-25J 44-30733
North American B-25J 44-28898

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Legend Of Aces Aviation
North American NA-64 3456
North American NA-64 3434
North American NA-64 3448

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Hi,

I own a machine shop and we make alot of componets for vintage airplanes. I would guess that the Material spec 57-108 is a North American part number. I would recommend using 4140 HT (Heat Treat) material. The tensil strength is high and you could still peen it over. It will be available through your local material house. I can supply you with more material specs and a material house, if you need it.

Bill

Patrick: Found this that might help....

http://www.aircorpsaviation.com/Website ... 0JE-36.pdf

Scroll down and look at p/n 46A4127.

Should give you enough data.