Corby Bolt Problem?

Brian Avila

Brian Avila

Joined
Jan 2, 2011
Messages
1,286
I bought some Corby Bolts for Jantz and they don't screw in all the way. Is this normal? I used the different methods about figuring out the drill depth for the countersink hole and the distance between the bolt ends is still greater than the material for the scales and tang when countersinked.

Can I cut the threads?

CorbyBolt.jpg
 
Grind the threads to right length.
 
I just wanted to make sure that was an acceptable solution. Hopefully I wont have any problems with the treads.

Thank you
 
Make sure your female side tapped drill hole will sit below the surface of your handle material, otherwise you will end up with a loveless style on one side.
 
I have never had that problem. I have used hundreds of Jantz's Corby bolts.

Try this:
Check the depth of the female shaft hole against the male threaded part ( use a toothpick) - Is the hole deep enough?
If the hole is deep enough, take two screwdrivers and try to seat the two halves together. There may be a slight bind stopping the fit. Make sure you aren't cross threading them.

If the hole isn't deep enough, or the two parts can't be screwed together, call Jantz.

It is OK to shorten the bolts, but unless there is a special situation, you should remove equal length from both halves.

When a Corby is a proper fit, the female part will go through the scale and tang, and stick out about 1/32-1/16" on the other side of the tang. The shoulders of the bolt holes should be 1/8" above the tang. This allows the bolt to tighten the scales to the tang with just the right amount of clamping pressure. Only tighten the bolts enough to be snug, over-tightening can tear or split the wood.

Final tip :
DRY FIT everything before applying any epoxy. All should be snug and show no gaps. If it needs fixing or adjusting, do it now.
 
Good words from Stacy,I've never seen one only go in that little bit,have had to retap a few.
Stan
 
I bought 8 and they are all like that. I emailed Jantz and we will see what they say. I might just go to loveless bolts after this problem.
 
TheWeatherman said:
I bought 8 and they are all like that. I emailed Jantz and we will see what they say. I might just go to loveless bolts after this problem.
Click to expand...
I've had loveless bolts that had threading issues (as in, they wouldn't without being retapped)---anything manufactured can be manufactured incorrectly. Obviously, it's up to you, but I wouldn't decide that the tens of thousands of corby bolts that have worked just fine pale in comparison to the bad eight you've received.
 
All I can add is, if you do need to grind the male part to length, sometimes the end of the thread can get a little fouled up. You can clean it up with a small file.
 
A good trick to help keep the threads in good shape is to take a Nut that is the same Thread pattern/size and screw it on before grinding then when done just undo the nut to remove or straighten messed up threads. then clean up with small file.
 
RyanW said:
A good trick to help keep the threads in good shape is to take a Nut that is the same Thread pattern/size and screw it on before grinding then when done just undo the nut to remove or straighten messed up threads. then clean up with small file.
Click to expand...

Great tip! Thanks for posting that Ryan.
 
Yep,
When I did electronics work, a new fellow asked why there were bolt holes threaded through the jaws of my wire cutter/stripper. I took a 8-32 bolt, threaded it in the hole ( with the jaws open) and then closed the jaws. It cut the bolt cleanly. I then unscrewed the bolt, and the threads on the end were straightened out by the die to remove the cutting burrs. The result was a perfect end. If I had just cut the bolt with the side cutters, it would never have worked without all sorts of file clean up.
 
I called Jantz. They said these bolts were made that way. I don't remember asking for that type so I am returning them. Thanks for your help guys.
 
Check with Pop's Knife Supply. His have always been A-1.

I may be wrong here, but it seems like someone once told me he makes them himself.

Robert
 
+1 Robert, Ive ran into issues with jantz corbys, premature grind-off, and that really sucks. I get my corbys from pops, great prices, quality, and service. Real nice corby reamers as well.
 
I've never seen that problem before, but it looks as if the female part wasn't threaded properly (if at all). May have to re-thread. How long is the bolt (male part)?
 
Yes, if you haven't packed them up yet, can you shoot a picture of one disassembled, and tell us how deep the female hole is?
 
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