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Landing gear attaching bolt identification help?

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offgridman

offgridman

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OK guys, I want to remove the old ones and install new bolts in the landing gear.
I am having problem figuring out what grade bolt to use.
The bolts are different. One bolt has a concave depression in the middle of its head and the other has markings I am not familiar with. Airplane is a stolp Starduster SA-100
Do any of your recognize this?

IMG_20161001_185202.jpg


IMG_20161001_185354.jpg
 
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