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Thread Chasers

super99

super99

Well-known Member
I make my own thread chasers by taking the correct size bolts and cut channels across the threads with a cut off wheel on my 4 inch hand grinder. Works good to clean out threads in blind holes.
cvphoto161549.jpg

Just a warning, dont drop the chaser in the transmission! My fingers were oily and as I unscrewed the chaser it slipped out of my fingers and fell into the transmission. I was lucky enough to fish it out with a magnet, Thank you Lord!
cvphoto161550.jpg
 
Handy trick and at the right time. I'll need to chase some metric threads soon and I don't own metric tap and dies.
 
i do that also when in a bind, but its not the same as a chaser.no place for the extra metal to go like on a chaser. as it should have a smaller diameter above a few threads. its ok just to clean out old gummed up threads though.
 
Have done that for years. Works great. I had some holes that were not tapped from the factory in an aluminum engine and the bolts were metric. Made a tap from the correct bolt and it put threads in it like it came factory.
 
Can you post how you made a tap from a bolt. I've heard of making a thread chaser from a bolt, but never a tap as I believe the begining threads of a tap are tapered.
 
(quoted from post at 08:54:47 08/23/23) Can you post how you made a tap from a bolt. I've heard of making a thread chaser from a bolt, but never a tap as I believe the begining threads of a tap are tapered.
Click to expand...

Same technique as you'd use to make a "thread chaser." Many people use tap and thread chaser interchangeably.

You would not use a bolt to cut new threads in a piece of steel. It simply would not work. Such makeshift "chasers" are only good for clearing/straightening existing threads.
 
Your home-made ones are better than the real thing from a strength standpoint. The ones with the reduced diameter shank will unexpectedly twist off for a variety of reasons dumbest idea ever. The ones you made will never break.
 
I just cut grooves in the bolt the same as the poster did in his pictures. Aluminum is soft and they cut threads like factory. Never tapered anything although you could grind a taper in it.
 
I don't know where you buy your thread chasers for them to break. I don't buy mine from HF. I buy high quality thread Chasers and High quality tap and die sets I don't buy cheap junk!!. In all the years I have never broke a chaser or tap using proper thread cutting lube..
 
If you like that sort of thing , have at it. I was merely pointing out to the guy that his home made chases are more reliable than commercial varieties that neck down the shank. Particularly vulnerable are sizes 3/8 inch on down. No matter how you slice it, a 3/8 chase with a reduced diameter shank has less torque capacity than a full sized 3/8 bolt.
 

"No matter how you slice it, a 3/8 chase with a reduced diameter shank has less torque capacity than a full sized 3/8 bolt."

so the alloy difference between a bolt and a commercial thread chaser make no difference you say??
 
(reply to post at 05:15:49 08/23/23) I like that you use the correct nomenclature, if it's in a blind hole it's technically a hex head cap screw, if it needs a nut to secure it it's a bolt.

If we're going to get nitpicky about stuff.
Click to expand...
 
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