Page 234 - Republic Drill

Spiral Pointed Taps

High Speed Steel – Ground Thread
Spiral Pointed Taps are used to solve the problem of tap breakage in
through hole tapping in a wide variety of materials. They shoot the chips
ahead of the tap thereby reducing loading and clogging in the flutes.
THREADING Standard Price Each Price Each
List No. 780 – Plug Chamfer
List No. 780B – Bottoming
No. of
Plug
Threads
Size
Flutes
Limits
780
780
780B
780B
Per Inch
Limits
28
H1
1/4
80
5.78
5.26
14.67
H3
2
2
0 Per Inch Thread Flutes 13.34 Bottoming Size Threads Thread No. of Plug Bottoming
1 64 H1 2 13.34 14.67 5/16 18 H3 2 7.65 8.41
1 72 H2 2 13.34 — 5/16 24 H3 2 7.65 8.41
2 56 H2 2 10.30 11.33 3/8 16 H3 3 7.69 8.46
2 64 H2 2 13.34 14.67 3/8 24 H3 3 7.69 8.46
3 48 H2 2 8.22 9.04 7/16 14 H3 3 12.60 ––
3 56 H2 2 8.92 9.81 7/16 20 H3 3 12.60 ––
4 36 H2 2 9.20 10.12 1/2 13 H3 3 13.08 16.40
4 40 H2 2 6.64 7.30 1/2 20 H3 3 13.08 ––
4 48 H2 2 7.68 8.45 9/16 12 H3 3 25.48 ––
5 40 H2 2 6.95 7.65 9/16 18 H3 3 25.48 ––
5 44 H2 2 7.95 8.75 5/8 11 H3 3 27.50 ––
6 32 H3 2 5.52 6.07 5/8 18 H3 3 27.50 ––
6 40 H2 2 6.28 6.91 3/4 10 H3 3 38.80 ––
8 32 H3 2 5.52 6.07 3/4 16 H3 3 38.80 ––
8 36 H2 2 6.28 6.91 7/8 9 H4 3 65.00 ––
10 24 H3 2 5.52 6.07 7/8 14 H4 3 65.00 ––
10 32 H3 2 5.52 6.07 1" 8 H4 3 88.00 ––
12 24 H3 2 6.28 6.91 1" 12 H4 3 88.00 ––
12 28 H3 2 6.28 6.91 1" 14 H4 3 88.00 ––
1/4 20 H3 2 5.26 5.78
Optional Thread Limits
List No. 780H – Plug Chamfer
Threads Thread No. of Price Threads Thread No. of Price
Size Size
Per Inch Limits Flutes Each Per Inch Limits Flutes Each
0 80 H2 2 13.34 1/4 28 H2 2 6.50
1 64 H2 2 13.34 1/4 28 H4 2 6.50
1 72 H1 2 13.34 1/4 28 H5 3 6.50
2 56 H1 2 13.34 5/16 18 H1 2 8.50
2 56 H3 2 13.34 5/16 18 H2 2 8.50
2 64 H1 2 13.34 5/16 18 H5 2 8.50
3 48 H1 2 9.20 5/16 24 H1 2 8.50
3 56 H1 2 9.20 5/16 24 H2 2 8.50
4 40 H1 2 8.65 5/16 24 H4 2 8.50
4 48 H1 2 8.65 5/16 24 H5 2 8.50
5 40 H1 2 8.65 3/8 16 H1 3 9.24
5 44 H1 2 10.50 3/8 16 H2 3 9.24
6 32 H1 2 6.50 3/8 16 H5 3 9.24
6 32 H2 2 6.50 3/8 24 H1 2 9.24
6 32 H6 2 6.50 3/8 24 H2 3 9.24
6 40 H1 2 8.50 3/8 24 H4 3 9.24
8 32 H1 2 6.50 3/8 24 H7 3 9.24
8 32 H2 2 6.50 7/16 14 H1 3 14.11
8 32 H5 2 6.50 7/16 14 H2 3 14.11
8 36 H1 2 7.50 7/16 14 H4 3 14.11
8 36 H3 2 7.50 7/16 14 H5 3 14.11
10 24 H1 2 6.50 7/16 20 H1 3 14.11
10 24 H2 2 6.50 7/16 20 H2 3 14.11
10 24 H5 2 6.50 7/16 20 H5 3 14.11
10 32 H1 2 6.50 1/2 13 H1 3 16.87
10 32 H2 2 6.50 1/2 13 H2 3 16.87
10 32 H4 2 6.50 1/2 20 H1 3 16.87
10 32 H5 2 6.50 1/2 20 H2 3 16.87
12 24 H1 2 7.00 1/2 20 H5 3 16.87
12 24 H2 2 7.00 9/16 12 H1 3 32.50
12 28 H1 2 7.00 5/8 11 H5 3 33.40
1/4 20 H1 2 6.50 3/4 10 H5 3 46.50
1/4 20 H2 2 6.50 3/4 16 H5 3 46.50
1/4 20 H5 2 6.50 7/8 9 H5 3 72.60
1/4 28 H1 2 6.50 1" 8 H6 3 100.72
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