What size taps and dies for thread cleaning ?

[wolf]

I am sure this has talked about before but I could not find a post about it when I did a search . What size taps and die should I purchase for cleaning the threads in threaded holes , nuts and bolts for big healeys ( mine is a 100-6 ) ? thanks in advance

 

[Superwrench]

7/16-14 UNC Tap for head studs. 1/4-28 UNF Tap for Oil Pan and Timing cover bolts. That will get you started. You will need a 5/16-24 UNF Tap for many other locations also. Good Luck

 

[Randy Forbes]

If you can find "thread chaser" sets (Sears has them) you're better off to use them.

A tap and or die will "cut" a little bit of material off when you use it in a hole or on a bolt; thread chasers are designed to "reform" any damaged threads without removing additional material__always my first choice over a cutting tool.

A thread chaser won't take the place of a tap or die when you <span style="text-decoration: underline">need</span> to cut new threads; every tool has it's purpose.

 

[Superwrench]

Wolf I have found that if you want to clean up a 50 year old block get some new quality taps and dies. Class 2B or lower. A 7/16 - 14 will not cut any bigger than 7/16 -14. Good luck with your project

 

[Patrick67BJ8]

If you can find "thread chaser" sets (Sears has them) you're better off to use them.

A tap and or die will "cut" a little bit of material off when you use it in a hole or on a bolt; thread chasers are designed to "reform" any damaged threads without removing additional material__always my first choice over a cutting tool.

A thread chaser won't take the place of a tap or die when you <span style="text-decoration: underline">need</span> to cut new threads; every tool has it's purpose.

I overhauled my engine and the crank threads were damaged and the machine shop that did the work used a thread chaser to clean them up and it was very cheap and done right the first time. Crank nut went on smooth! The Sears near me was no help in trying to find a thread chaser the correct size.

 

[drambuie]

You may want to check with your local Granger supply to find your thread chasers, taps and dies along with any other specialty tooling you may need. Michael.

 

[Randy Forbes]

If you can find "thread chaser" sets (Sears has them) you're better off to use them.

A tap and or die will "cut" a little bit of material off when you use it in a hole or on a bolt; thread chasers are designed to "reform" any damaged threads without removing additional material__always my first choice over a cutting tool.

A thread chaser won't take the place of a tap or die when you <span style="text-decoration: underline">need</span> to cut new threads; <span style="font-weight: bold">every tool has it's purpose.</span>

I overhauled my engine and the crank threads were damaged and the machine shop that did the work used a thread chaser to clean them up and it was very cheap and done right the first time. Crank nut went on smooth! The Sears near me was no help in trying to find a thread chaser the correct size.

Then, you use a thread file.

 

[bob hughes]

Smaller holes could well be BA threads- on the head lamp bowls etc.




Bob