Classic & Vintage - Quill stem bolt diameter differences???

I am trying to fix a buddies quill stem corrected. The bolt remains in the head tube as the quill stem is siezed to the fork. I have 4 quill stem bolts that won't screw into the floating nut as the opening on the nut just seems too small. The stem is an 85 3TTT panto with Pinarello so I am trying to salvage it. Do the make different size bolts and nuts for quills? I thought they were the same.

GG

Yes they make different sized bolts for stems. Roger

Yes they make different sized bolts for stems. Roger

we are talking about diameters, not length.

yes they do make differnt diameter bolts. if the bolt is out why are you trying to reinstall it if the stem is stuck? I would use the largest diameter bolt I coult get through the hole to tap the wedge out of the way. you have applied that PB blaster stuff yes?

yes they do make differnt diameter bolts. if the bolt is out why are you trying to reinstall it if the stem is stuck? I would use the largest diameter bolt I coult get through the hole to tap the wedge out of the way. you have applied that PB blaster stuff yes?

The stem is seized so there is no place for the wedge bolt to go. I want the quill bolt to screw into the nut but the diameter of the nut hole looks to be too small for the various quill bolts I have. I wasn't aware the threading on the quill nuts and bolts had differences.

GG

I think it's more the diameter of the bolt head is larger rather than the diameter of the threaded shaft; I have several older stem bolts that will thread into the quill of newer stems, but the bolt heads are too large for the recess in the stem.

well aside from the fact you can't get the bolt in. why is the stem STUCK? if you can get something solid against the wedge to knock it loose then once it and the stem are out it will be easier to find the correct bolt before you reinstall it.

OH how small is the frame? if it is very small like a 50 or 52 you might be able to attack this from the bottom aswell

well aside from the fact you can't get the bolt in. why is the stem STUCK? if you can get something solid against the wedge to knock it loose then once it and the stem are out it will be easier to find the correct bolt before you reinstall it.

OH how small is the frame? if it is very small like a 50 or 52 you might be able to attack this from the bottom aswell

Stem is totally seized. This is all too common with alloy to steel meetings without lube. There is NO way this will be unseized. So, what I have left is a bolt stuck inside the head tube (loose). I have 4 quill bolts and none of them are able to screw into this loose bolt inside the head tube. The hole on the nut seems to be so small. So, my question continues to be, is this normal? Is there varying sizes of holes and threading on quill nuts/wedges?

-GG-

I think it's more the diameter of the bolt head is larger rather than the diameter of the threaded shaft; I have several older stem bolts that will thread into the quill of newer stems, but the bolt heads are too large for the recess in the stem.

Not in this case. The bolt is the perfect size and is loose inside the head tube. The problem remains that the quill stem bolt won't screw into the nut trapped inside the head tube.

-GG-

I only know of two sizes of stem bolts, and you can tell them apart by looking at them. I sold someone a stem recently, and had to give them a Ti bolt because it was the only one I had that fit...

The size is probably O.K. You're just not getting the bolt started straight into the wedge. The wedge is likely tipped. Obviously you can't get at it to hold it straight or keep it from spinning. Unscrewwing it all the way was the first mistake. Maybe a wooden dowel pushed up from the underside will help steady it. Keep trying.

The size is probably O.K. You're just not getting the bolt started straight into the wedge. The wedge is likely tipped. Obviously you can't get at it to hold it straight or keep it from spinning. Unscrewwing it all the way was the first mistake. Maybe a wooden dowel pushed up from the underside will help steady it. Keep trying.

I'll try it again. I worked it for two hours last night but was having my own Oktoberfest at the same time. I used a dowel from the bottom and screwed from the top (don't quote me out of context).

-GG-

sounds like an Oktoberfest to me....