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Procunier Collet Sizes
For S.T.I. (Screw Thread Insert) or Hellicoil®  Taps

S.T.I. Tap Use Collet Size
4-40 #6
6-32 #10
8-32 #12
10-24 #14
10-32 #14
12-24 9/32
12-28 9/32
1/4-20 5/16
1/4-28 5/16
5/16-18 3/8
5/16-24 3/8
3/8-16 1/2
3/8-24 7/16
7/16-14 9/16
7/16-20 1/2
1/2-13 5/8
1/2-20 9/16
7/8 1"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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