| Type |
Characteristics |
Purpose |
Use |
Treatments
Oxidation
(homogenization) |
- Treated layer : 1 - 3 um
- Oxidized coat layer (Fe304)
- Porous with cutting oil held in pores
- Lowered coefficient of friction
- Prevents fusing
- Unsuitable for non-ferrous metals for internal threads
|
Prevent fusing |
For internal thread material easily fused to tap materials
- Stainless steel
- Titanium alloy
- Mild steel such as SS400 and S15C
|
| Nitriding |
- Treated layer: 30 - 50 um
- Surface hardness: 1000 - 1300HV
- Improve wear resistance
- Infiltration into basic materials
|
Wear resistance
|
For internal thread materials that wear easily
- Cast iron
- Silicon alloy
- Heat-hardened resin
|
| TiN coating |
- Treated layer: 1 - 3 um
- Surface hardness: 2000 HV
- Improved wear resistance
- Lowered coefficient of friction
- Prevents fusing
- Improved heat resistance
|
Prevents fusing
Lubrication |
For internal thread material easily fused to tap materials or that wear
- Mild steel such as SS400 and S15C
- Hard steel such as S45C
- Alloy tool steels
- Heat treated steels
|
| V (TiCN) coating |
- Treated layer: 3 - 6 um
- Surface hardness: 3000 HV
- Improved wear resistance
- Lowered coefficient of friction
- Prevents fusing
- Improved heat resistance
|
Prevents fusing
Lubrication |
For internal thread material easily fused to tap materials or that wear
- Mild steel such as SS400 and S15C
- Hard steel such as S45C
- Alloy tool steels
- Heat treated steels
|
| CrN coating |
- Treated layer: 3 - 5 um
- Surface hardness: 1800 HV
- Prevents fusing
- Improved corrosion resistance
- Improved lubrication
|
Prevents fusing
Lubrication
|
For internal thread material easily fused to tap materials
|
| Fx (TiAN) coating |
- Treated layer: 2- 4 um
- Surface hardness: 2800 HV
- Improved heat resistance
- Improved wear resistance
|
Wear resistance |
For internal thread materials that wear easily
- High speed cutting (helical cutting)
|