bolts with low profile heads?

[jwilbur]

Where my mixture cable attaches to the control arm I've got some interference with the bolt head hitting the FAB. My solution was to simply sand down the head of an AN3 bolt by about half and that did the trick.

Now I'd like to find a "real" one (i.e., one manufactured this way) but can't seem to find anything like it on-line. Does anybody know if they make a low profile head AN3-10A and where I can buy them?

[Bicyclops]

You want AN23 clevis bolts. You can get them at Aircraft Spruce and elsewhere.

Ed Holyoke

[jwilbur]

Originally Posted by Bicyclops

You want AN23 clevis bolts. You can get them at Aircraft Spruce and elsewhere. Ed Holyoke

Maybe. I'll have to check if there's enough clearance at some point in the control arm travel to get a screw driver on the head. I'd rather a bolt for this reason, however.

[rmartingt]

I wonder if a Hilock would work? There's nothing on the head to grip; the threaded end has a hex (Allen) recess so you'd use a hex bit/key and a wrench to tighten.

[snopercod]

What about NAS6203 SHEAR BOLTS (.189" dia)? Head height is between 0.110 inches and 0.125 inches. The NAS6204 are .249 dia.

[jwilbur]

Originally Posted by snopercod

What about NAS6203 SHEAR BOLTS (.189" dia)? Head height is between 0.110 inches and 0.125 inches. The NAS6204 are .249 dia.

These might work. Looks like the 6203 has the right diameter and threads. I'll verify and order a few and see. Thank you very much!

[az_gila]

Originally Posted by snopercod

What about NAS6203 SHEAR BOLTS (.189" dia)? Head height is between 0.110 inches and 0.125 inches. The NAS6204 are .249 dia.

Not really,

NAS6203 head height is 0.110 to 0.125 inches

AN3 head height is 0.109 to 0.141 inches

With it being that close you might be better off just getting a bunch of AN3 bolts and measuring the heights to get one at the low end of the tolerance.

But, do you really want any control system to have moving parts with a clearance measured in 10s of thousands?

[Auburntsts]

Joe,
If you didn't install the optional VA-131Q Recess on your FAB, would doing so eliminate the interference issue?

[jwilbur]

Originally Posted by Auburntsts

Joe,
If you didn't install the optional VA-131Q Recess on your FAB, would doing so eliminate the interference issue?

The recess is installed. It's the recess it's scraping. ... All I can say is that it used to fit before I put the rivets in. Very annoying, but that's another story.

[jwilbur]

Originally Posted by az_gila

But, do you really want any control system to have moving parts with a clearance measured in 10s of thousands?

Not really.