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6. Recommended Tapping Speed
Tapping Speed
The following machining conditions aff ect tapping speed: kind of taps, workpieces, number of chamfered threads, materials, hole conditionand SP lubricant. It is necessary to select the suitable tapping speed by paying attention to these conditions. When work material has excellent workability, when there is a little depth of tapping, or when tapping lubricant can be sufficient, select rather higher tapping speed. When workability of work material is unknown, to be safe, try nearly the lowest tapping speed at fi rst, and then increase the speed gradually. Following speed is basically for the cutting condition under the use of cutting oil. In case of water soluble cutting oil, please reduce the speed by 30%.
SL
Tapping Speed - Vc(m/min) Workpiece Materials
PO
Spiral Fluted Spiral Pointed Roll Taps Straight Fluted Cemented Carbide
| Low Carbon Steels | St44, C10~C25 | 8~15 | 10~20 | 8~15 | 6~10 | - | ||
| Medium Carbon Steels | C25~C45 | 6~12 | 8~14 | 7~12 | 5~9 | - | ||
| High Carbon Steels | C45~C58 | 5~10 | 8~12 | 5~10 | 5~8 | - | ||
| Alloy Steels | CrMo~NiCrMo | 5~10 | 7~10 | 5~10 | 5~8 | ST - | ||
| Thermal refi ned steels | 20~45HRC | 3~5 | 4~7 | - | 3~6 | - | ||
| Stainless Steels | AISI | 3~8 | 4~9 | 6~15 | 3~7 | - | ||
| Tool Steels | 1.2311, 1.2344 | 5~8 | 6~10 | - | 5~9 | - | ||
| Cast Steels | SC | 6~10 | 8~13 | - | 6~10 | ROLL - | ||
| Cast Irons | GG | - | - | - | 12~17 | 15~25 | ||
| Ductile Cast Irons | GGG | 5~10 | 5~10 | - | 5~8 | 12~20 | ||
| Coppers | Cu | 8~12 | 8~13 | 25~35 | 7~11 | 15~33 | ||
| Brass · Brass Casting | Bs · BsC | 11~22 | 13~25 | 25~35 | 10~20 | 23~33 | CARBIDE |
Phosphor Bronze ·
PB · PBC 8~15 10~18 25~35 8~15 18~33
Phosphor Bronze Casting
| Wrought Aluminum | Al | 15~25 | 20~25 | 25~35 | 15~20 | 23~40 |
| Aluminum Alloy Castings | AlSi | 11~22 | 12~24 | 15~25 | 10~20 | 15~25 |
LONG
| Magnesium Alloy Castings | MC | 7~15 | 10~20 | - | 7~15 | 12~20 | |||
| Zinc Alloy Diecastings | ZDC | 7~15 | 10~20 | 15~25 | 7~15 | 12~20 | |||
| Thermosetting Plastic | Bakelite (phenol-PF) | 11~17 | 12~18 | - | 10~15 | 15~25 | |||
| Thermoplastic resin | PVC, Nylon | 11~17 | 12~18 | - | 10~15 | 15~25 | HAND | ||
| Titanium Alloys | Ti-6Al-AV etc | 6~9 | 6~8 | - | - | - | TAPS | ||
| Nickel Base Alloys | Hastelloy, Inconel, Waspaloy | 3~6 | 3~6 | - | - | - |
EG (STI)
Formula
Tapping Speed (Vc) Revolution per minute (n)
SPECIAL
THREADS,
GAUGES
| n : Revolutions per minute (min-1) | Vc : Tapping Speed (m/min) | THREAD | |
| π : 3.14 | Dc : Nominal diameter of tap (mm) | MILLS |
Dc : Nominal diameter of tap (mm) π : 3.14