Steep taper DIN ISO 7388-1 SK30/SK40/SK50 (formerly DIN 69871)
The traditional interface for milling spindles DIN ISO 7388-1 (formerly 69871) distinguishes itself through its extremely robust design. Its field of application ranges from fine machining to heavy duty roughing. The tool holder is pulled in the milling spindle with the help of an additional pull stud. The centering takes place via the taper contact. Therefore, the DIN ISO 7388-1 (formerly 69871) interface is primarily suitable for applications with a spindle speed of up to 12,000 rpm.
Steep taper SK30
- Tool holders case-hardened 60 – 2 HRC
- Tensile strength in the core at least 950 N/mm2
- Taper in tolerance quality AT3
- Angle of cone: 8° 17'50'' +4''
- Incl. bore for data chip Ø 10 mm
- Form ADF: interior coolant supply through centre (form AD) and through the collar (form AF)
| SK30 | D1 | D2 | D3 max | D4 | D5 | D6 | L1 | L2 | L3 | L4 min. | L5 | T | T1 | B1 | B2 | B3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [mm] | 31,75 | 13 | 43 | 50 | - | 10 | 47,8 | 19,1 | 15,9 | 35 | 11,1 | M12 | 4,65 | 16,1 | 16,4 | 19 |
Steep Taper Sk40
- Tool holders case-hardened 60 – 2 HRC
- Tensile strength in the core at least 950 N/mm2
- Taper in tolerance quality AT3
- Angle of cone: 8° 17'50'' +4''
- Incl. bore for data chip Ø 10 mm
- Form ADF: interior coolant supply through centre (form AD) and through the collar (form AF)
| SK40 | D1 | D2 | D3 max | D4 | D5 | D6 | L1 | L2 | L3 | L4 min. | L5 | T | T1 | B1 | B2 | B3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [mm] | 44,45 | 17 | 48 | 63,55 | 54 | 10 | 68,4 | 19,1 | 15,9 | 35 | 11,1 | M16 | 4,65 | 16,1 | 22,8 | 25 |
Steep paper SK50
- Tool holders case-hardened 60 – 2 HRC
- Tensile strength in the core at least 950 N/mm2
- Taper in tolerance quality AT3
- Angle of cone: 8° 17'50'' +4''
- Incl. bore for data chip Ø 10 mm
- Form ADF: Interior coolant supply through centre (form AD) and through the collar (form AF)
| SK50 | D1 | D2 | D3 max | D4 | D5 | D6 | L1 | L2 | L3 | L4 min. | L5 | T | T1 | B1 | B2 | B3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [mm] | 69,85 | 25 | 78 | 97,5 | 84 | 10 | 101,75 | 19,1 | 15,9 | 35 | 11,1 | M24 | 4,65 | 25,7 | 35,5 | 37,7 |
Coolant supply DIN ISO 7388-1 (formerly DIN 69871)
According to DIN ISO 7388-1 (formerly DIN 69871), 3 possibilities of inner coolant supply are available:
- Form A: No inner coolant supply
- Form AD: Central coolant supply through retention knob. A retention knob with centralized bore is required.
- Form AF: Lateral coolant supply via the collar. A sealed retention knob is required.
retention knob is required. Haimer clamping devices with taper according to DIN ISO 7388-1 (formerly DIN 69871) are performed in form AD/AF unless otherwise noted.
Unless otherwise stipulated, the tool holders are delivered in form AD. The bores at the collar for form AF are then sealed with plastic-dowels and secured with lock screws.
For changing to form AF, the bores at the collar must be opened by unscrewing the lock screw halfway. Extraction of screws together with thedowels by using pliers.
The bores also can be sealed again. A conversion kit consisting of dowels and lock screws is available.
Attention: Each dowel for single use only!