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Besly Special Purpose
Turbo Cut®
STI Taps

High Speed Steel
Ground Thread

Spiral Flute
2, 3 and 4 Flute


Machine Screw Sizes:
4 | 5 | 6 | 8 | 10 | 12

Fractional Sizes:
1/4 | 5/16 | 3/8 | 7/16 | 1/2

 Catalog Number: 4118

Besly Special Purpose Turbo Cut® STI Taps     
These Besly Special Purpose Taps are ideal for all threading involving helical coil inserts. They are ideal for soft, ductile materials and  are especially good for deep, blind or long through holes and have been designed for high production tapping.

Please call 800 435-2965 for current prices.

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All dimensions are in inches.                 
  Besly Special Purpose
Turbo Cut®
STI Taps
Catl No. 4118
Machine Screw Sizes		    
 
Besly Surface Treatments Besly Drill Selector
Tap Size
& TPI		 No. of Flutes Cham Type P.D. Limits Surface Treat EDP No Pkg Qty Basic Pitch Dia. Overall Length
A		 Thread Length
B		 Shank Dia.
C		 Square Length
D		 Square Size
E
4-40 2 Plug H1   10668 12 .1283 2 11/16 .141 3/16 .110
4-40 2 Plug H2   10676 12 .1283 2 11/16 .141 3/16 .110
4-40 2 Bot H1   10669 12 .1283 2 11/16 .141 3/16 .110
4-40 2 Bot H2   10677 12 .1283 2 11/16 .141 3/16 .110
5-40 3 Plug H2   10686 12 .1413 2-1/8 3/4 .141 1/4 .131
5-40 3 Bot H2   10687 12 .1413 2-1/8 3/4 .141 1/4 .131
6-32 3 Plug H2   10688 12 .1583 2-3/8 7/8 .141 1/4 .152
6-32 3 Plug H3   10696 12 .1583 2-3/8 7/8 .141 1/4 .152
6-32 3 Bot H2   10689 12 .1583 2-3/8 7/8 .141 1/4 .152
6-32 3 Bot H3   10697 12 .1583 2-3/8 7/8 .141 1/4 .152
6-40 3 Plug H1   10698 12 .1543 2-1/8 3/4 .141 1/4 .131
6-40 3 Plug H2   10706 12 .1543 2-1/8 3/4 .141 1/4 .131
6-40 3 Bot H1   10699 12 .1543 2-1/8 3/4 .141 1/4 .131
6-40 3 Bot H2   10707 12 .1543 2-1/8 3/4 .141 1/4 .131
8-32 3 Plug H2   10708 12 .1843 2-3/8 15/16 .168 9/32 .165
8-32 3 Plug H3   10716 12 .1843 2-3/8 15/16 .168 9/32 .165
8-32 3 Bot H2   10709 12 .1843 2-3/8 15/16 .168 9/32 .165
8-32 3 Bot H3   10717 12 .1843 2-3/8 15/16 .168 9/32 .165
10-24 3 Plug H2   10718 12 .2170 2-1/2 1 .255 5/16 .191
10-24 3 Plug H3   10726 12 .2170 2-1/2 1 .255 5/16 .191
10-24 3 Bot H2   10719 12 .2170 2-1/2 1 .255 5/16 .191
10-24 3 Bot H3   10727 12 .2170 2-1/2 1 .255 5/16 .191
10-32 3 Plug H2   10728 12 .2103 2-1/2 1 .255 5/16 .191
10-32 3 Plug H3   10736 12 .2103 2-1/2 1 .255 5/16 .191
10-32 3 Bot H2   10729 12 .2103 2-1/2 1 .255 5/16 .191
10-32 3 Bot H3   10737 12 .2103 2-1/2 1 .255 5/16 .191
12-24 3 Plug H3   10746 12 .2403 2-1/2 1 .286 5/16 .214
12-24 3 Bot H3   10747 12 .2403 2-1/2 1 .286 5/16 .214
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All dimensions are in inches.                 
  Besly Special Purpose
Turbo Cut®
STI Taps
Catl No. 4118
Fractional Sizes		    
 
Besly Surface Treatments Besly Drill Selector
Tap Size
& TPI		 No. of Flutes Cham Type P.D. Limits Surface Treat EDP No Pkg Qty Basic Pitch Dia. Overall Length
A		 Thread Length
B		 Shank Dia.
C		 Square Length
D		 Square Size
E
1/4-20 3 Plug H2   10748 12 .2825 2-22/32 1-1/8 .318 3/8 .238
1/4-20 3 Plug H3   10061 12 .2825 2-22/32 1-1/8 .318 3/8 .238
1/4-20 3 Bot H2   10749 12 .2825 2-22/32 1-1/8 .318 3/8 .238
1/4-20 3 Bot H3   10757 12 .2825 2-22/32 1-1/8 .318 3/8 .238
1/4-28 3 Plug H2   10758 12 .2732 2-22/32 1-1/8 .318 3/8 .238
1/4-28 3 Plug H3   10766 12 .2732 2-22/32 1-1/8 .318 3/8 .238
1/4-28 3 Bot H2   10759 12 .2732 2-22/32 1-1/8 .318 3/8 .238
1/4-28 3 Bot H3   10767 12 .2732 2-22/32 1-1/8 .318 3/8 .238
5/16-18 3 Plug H3   10768 12 .3486 2-15/16 1-1/4 .381 7/16 .286
5/16-18 3 Bot H3   10769 12 .3486 2-15/16 1-1/4 .381 7/16 .286
5/16-24 3 Plug H3   10786 12 .3395 2-15/16 1-1/4 .381 7/16 .286
5/16-24 3 Bot H3   10787 12 .3395 2-15/16 1-1/4 .381 7/16 .286
3/8-16 3 Plug H3   10788 12 .4156 3-3/8 1-21/32 .367 7/16 .275
3/8-16 3 Plug H4   10796 12 .4156 3-3/8 1-21/32 .367 7/16 .275
3/8-16 3 Bot H3   10789 12 .4156 3-3/8 1-21/32 .367 7/16 .275
3/8-16 3 Bot H4   10797 12 .4156 3-3/8 1-21/32 .367 7/16 .275
3/8-24 3 Plug H2   10798 12 .4020 3-5/32 1-7/16 .323 13/32 .242
3/8-24 3 Plug H3   10806 12 .4020 3-5/32 1-7/16 .323 13/32 .242
3/8-24 3 Bot H2   10799 12 .4020 3-5/32 1-7/16 .323 13/32 .242
3/8-24 3 Bot H3   10807 12 .4020 3-5/32 1-7/16 .323 13/32 .242
7/16-14 4 Plug H3   10808 12 .4839 3-19/32 1-21/32 .429 1/2 .322
7/16-14 4 Bot H3   10809 12 .4839 3-19/32 1-21/32 .429 1/2 .322
7/16-20 3 Plug H3   10818 12 .4700 3-3/8 1-21/32 .367 7/16 .275
7/16-20 3 Bot H3   10819 12 .4700 3-3/8 1-21/32 .367 7/16 .275
1/2-13 4 Plug H3   10828 12 .5499 3-13/16 1-13/16 .480 9/16 .360
1/2-13 4 Bot H3   10829 12 .5499 3-13/16 1-13/16 .480 9/16 .360
1/2-20 4 Plug H3   10838 12 .5325 3-19/32 1-13/32 .429 1/2 .322
1/2-20 4 Bot H3   10839 12 .5325 3-19/32 1-21/32 .429 1/2 .322
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