Punch Press
Burring Hole Reference
The table below shows the pre-pierce (mm) and burred hole (mm) sizes for Mild Steel.
Pre-Pierced Hole (øA)
Nominal Burr Hole (øB)
Material Thickness
0.8 mm 1.0 mm 1.2 mm 1.6 mm 2.0 mm 2.3 mm
Tap Size
M2.6 x 0.45
1.2 1.2
1.2 1.5 2.0 2.0 2.0
1.4 1.5 2.0 2.0 2.0
1.6 1.7 2.1 2.6 3.4
- -
- -
2.21 2.57 3.40 4.30 5.10
M3 x 0.5 M4 x 0.7 M5 x 0.8 M6 x 1.0
- - -
2.3 3.0 3.8
2.7 3.1 3.8
ø A
t
ø B
Countersink Hole Reference
The table below shows the nominal pre-pierce hole (mm) sizes required for a countersink operation for Mild Steel.
Screw Size
Material Thickness (mm)
M2 x0.4
M2.5 x0.45
M2.6 x0.45
M3 x0.5
M4 x0.7
M5 x0.8
M6 x1.0
1.0 1.2 1.5 1.6 2.0 2.3 2.5 3.0 3.2
3.5 3.5 3.2 3.0 3.0 3.0
4.5 4.5 4.2 4.0 3.8 3.8
4.8 4.5 4.5 4.3 4.0 4.0
5.7 5.3 5.3 5.0 4.8 4.8 4.5 4.4 4.0
-
- -
- - -
7.3 7.3 7.0 7.0 6.8 6.5 6.0 5.8
9.0 8.8 8.6 8.5 8.4 8.0 7.8
10.8 10.6 10.5 10.4 10.0
- - -
- - -
- - -
9.8
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