Reamer size for AN174

[jaredyates]

Does anyone know the preferred size of reamer to use with the AN174 close tolerance bolt?

[Mark Goldberg]

Jared, there are reamers of every .001. I assume you are trying to get a good hole with no play. I would measure the bolt diameter, and get a reamer perhaps .001 bigger. I would fear that if you got a reamer the same diameter as the bolt that you could not get the bolt in. Mark

[spinningwrench]

Use a micrometer that you have just checked on a gage block. Order a reamer .0005" oversize. McMaster has them in 1/2 thousands increments. https://www.mcmaster.com/reamers If it is a real long bushing that is welded sometimes you have to go a bit larger as the bushing may not be a perfectly straight hole and your bolt may not go in. This was the case for my engine mounting bushings. A reamer will make the hole round but not perfectly straight if the bushing is longer than the reamer.

[jaredyates]

The bolts are between 0.2487 inches and 0.2492 inches per the spec, so I'm thinking 0.249, or does it need to be .250?

[Bdflies]

With all that information, I'd get the .249” reamer.

Bill

[spinningwrench]

I’m thinking a .2490 and a .2495 might be required. You can ream to exactly match the bolt. Are these for the wings?

[jaredyates]

Working on trying to tighten up the control stick assembly.

[Mark Goldberg]

I would get the bolts first and see what you have. Then order the reamer accordingly. Mark