American Model Engineering Supply

Taps
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High speed steel taps made to H2 thread limits. 

tap.01.jpg

 

From experience in the shop, we have learned to not use carbon steel taps and dies.  While carbon steel taps can be broken out of a part if the tap breaks, we have found they break far more easily than do taps made of High Speed Steel.  As a result, we don’t even allow carbon steel taps in the shop.  While High Speed Steel taps and dies are slightly more expensive, the much lower rate of breakage more than makes up for the difference.   We find very little use for taper taps; plug and bottoming being almost exclusively used here.  We use gun taps (spiral cutting taps) whenever possible.  The big advantage here is that the tap drives the chips before it rather than loading up the flutes, which is the major cause of breakage.  Of course, with a blind hole, if threads are required all the way to the bottom, a bottoming tap must be used to finish the threads.  A suitable cutting oil for the material being threaded will go a long way towards preserving the sharpness of the tool cutting edge and lowering the effort required to generate threads.

 

Size

Gun

Taper

Plug

Bottoming

0-80

THG0080

 

THP0080

THB0080

1-72

THG0172

 

THP0172

THB0172

2-56

THG0256

 

THP0256

THB0256

3-48

THG0348

 

THP0348

THB0348

4-40

THG0440

 

THP0440

THB0440

5-40

THG0540

 

THP0540

THB0540

6-32

THG0632

 

THP0632

THB0632

8-32

THG0832

 

THP0832

THB0832

8-36

 

THT0836

 

 

10-24

THG1024

 

THP1024

THB1024

10-32

THG1032

 

THP1032

THB1032

10-40

 

THT1040

 

 

5/32-40

 

THT5340

THP5340

THB5340

1/4-32

 

THT1432

THP1432

THB1432

1/4-40

 

THT1440

THP1440

THB1440

5/16-18

THG5618

 

THP5618

THB5618

5/16-24

THG5624

 

THP5624

THB5624

5/16-40

 

THT5640

THP5640

THB5640

3/8-32

 

THT3832