Page 193 - Mechanical Engineer's Data Handbook

MANUFACTURING TECHNOLOGY 181

Material Drilling Reaming Tapping
Mild steel (hot and Soluble oil, mineral Mineral lard oil Soluble oil, lard oil
cold rolled) oil, lard oil
Tool steel (carbon Soluble oil, lard oil Lard oil Sulphur base oil,
and high speed) with sulphur mineral lard oil
Alloy steel Soluble oil, Lard oil Sulphur base oil,
mineral oil mineral lard oil
Brass and bronze Dry, lard oil, Soluble oil Soluble oil, lard oil
paraffin mixture
Copper Soluble oil Soluble oil Soluble oil, lard oil
Aluminium Paraffin, lard oil Mineral lard oil Soluble oil, mineral
lard oil
Monel metal Lard oil, sulphur Mineral lard oil, Mineral lard oil,
base oil sulphur base oil sulphur base oil
Malleable iron Soluble oil Soluble oil Soluble oil
Cast iron Dry Dry Dry, lard oil for
nickel cast iron

Tapping tirill &xis for metric coarse threads

Nominal Thread Tap
diameter pitch drill size
(mm) (mm) (mm)

1.6 0.35 1.20 20.0 2.50 17.5
2.0 0.40 1.60 24.0 3 .O 21.0
2.5 0.45 2.05 30.0 3.50 26.5
3 .O 0.50 2.50 36.0 4.00 32.0
3.5 0.60 2.90 42.0 4.50 37.5
4.0 0.70 3.30 48.0 5.00 43.0
5 .O 0.80 4.20 56.0 5.50 50.5
6.0 1 .o 5.30 64.0 6.00 58.0
8.0 1.25 6.80 72.0 6 .00 66.0
10.0 1 so 8.50 80.0 6.00 74.0
12.0 1.75 10.20 90.0 6.00 84.0
14.0 2.00 12.00 100.0 6.00 94.0
16.0 2.00 14.00