RECOMMENDED TAPPING SPEEDS & LUBRICANTS
2. When work material has excellent workability, when there is a little depth of tapping, or when tapping flud can be sufficieny, select rather high tapping speed. When workability of work material is unknown, it is safe to try nearly the lowest tapping speed at first, and theen increwse the speed gradually.
Workpiece materials |
Tapping speed |
Cutting fluids |
|||||||
Hand tap |
Spiral fluted tap |
Spiral pointed tap |
Fluteless tap |
Pipe thread tap |
Non water- soluble |
water-soluble |
Semi- dry |
||
Low Carbon Steels |
≦C 0.2% |
7∼12 |
8∼13 |
10∼20 |
8∼14 |
3∼7 |
◎ |
☉ |
△ |
Medium Carbon Steels |
C 0.25≦0.45% |
6∼11 |
6∼12 |
8∼15 |
7∼10 |
3∼6 |
◎ |
☉ |
△ |
High Carbon Steels |
≦C 0.45% |
5∼9 |
5∼10 |
8∼13 |
5∼8 |
2∼5 |
◎ |
☉ |
△ |
Alloy Steels |
SCM.SNCM |
6∼10 |
6∼12 |
7∼11 |
5∼8 |
2∼5 |
◎ |
△ |
△ |
Thermal Refined Steels |
20≦45HRC |
3∼5 |
3∼5 |
4∼7 |
─ |
2∼5 |
◎ |
△ |
─ |
Stainless Steels |
SUS |
3∼7 |
3∼8 |
4∼10 |
5∼10 |
3∼8 |
◎ |
☉ |
─ |
Tool Steels |
SKD |
5∼9 |
5∼9 |
6∼9 |
─ |
2∼4 |
◎ |
─ |
─ |
Cast Steels |
SC |
6∼11 |
6∼11 |
8∼15 |
─ |
2∼5 |
◎ |
☉ |
─ |
Cast Irons |
FC |
10∼16 |
─ |
─ |
─ |
2∼5 |
◎ |
☉ |
☉ |
Ductile Cast Irons |
FCD |
6∼12 |
6∼12 |
7∼16 |
─ |
4∼8 |
◎ |
☉ |
☉ |
Coppers |
CU |
6∼10 |
6∼11 |
7∼13 |
7∼13 |
3∼5 |
☉ |
☉ |
─ |
Brass.Brass Casting |
BS. BSC |
10∼18 |
10∼20 |
13∼25 |
7∼13 |
5∼10 |
☉ |
☉ |
☉ |
Bronze.Bronze Casting |
PB. PBC |
6∼12 |
6∼12 |
10∼18 |
7∼12 |
5∼11 |
☉ |
☉ |
─ |
Wrought Aluminum |
AL |
10∼20 |
10∼20 |
15∼25 |
10∼20 |
5∼12 |
◎ |
☉ |
△ |
AluminumAlloyCastings |
AC. ADC |
10∼17 |
10∼17 |
12∼20 |
10∼16 |
10∼15 |
◎ |
☉ |
△ |
Magnesium Alloy Castings |
MC |
7∼12 |
7∼12 |
10∼17 |
─ |
7∼12 |
◎ |
☉ |
△ |
Zinc Alloy Die castings |
ZDC |
7∼15 |
7∼15 |
10∼17 |
7∼12 |
7∼15 |
◎ |
☉ |
△ |
Thermosetting Plastic |
BAKELITE PHENOL-PF |
10∼17 |
10∼17 |
10∼18 |
─ |
5∼10 |
─ |
☉ |
☉ |
Thermoplastic |
VINYL. PVC NYLON |
10∼17 |
10∼17 |
10∼18 |
─ |
5∼10 |
─ |
☉ |
☉ |
Titanium Alloys |
Ti-6AL-4V |
─ |
3∼8 |
4∼9 |
─ |
─ |
◎ |
☉ |
─ |
• Cutting fluids ◎ideal ☉good △applicable ─not applicable