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Steep taper DIN 69871 SK30/SK40/SK50

Products steep taper DIN 69871 SK30/SK40/SK50

The traditional interface for milling spindles DIN 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 69871 interface is primarily suitable for applications with a spindle speed of up to 12,000 rpm.


Technical specifications DIN 69871

Steep taper SK30

DIN 69871 SK30 technical drawing
  • 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'' +5''
  • Incl. bore for data chip Ø 10 mm
  • Form ADB: interior coolant supply through centre (form AD) and through the collar (form B)
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

DIN 69871 SK40 technical drawing
  • 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'' +5''
  • Incl. bore for data chip Ø 10 mm
  • Form ADB: interior coolant supply through centre (form AD) and through the collar (form B)
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 taper SK50

DIN 69871 SK50 technical drawing
  • 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'' +4.5''
  • Incl. bore for data chip Ø 10 mm
  • Form ADB: Interior coolant supply through centre (form AD) and through the collar (form B)
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 69871

According to DIN 69871, 3 possibilities of inner coolant supply are available:

DIN 69871 SK30/SK40/SK50 possibilitiers of onner coolant supply
  • Form A: No inner coolant supply
  • Form AD: Central coolant supply through retention knob. A retention knob with centralized bore is required.
  • Form B: Lateral coolant supply via the collar. A sealed retention knob is required.

    Haimer clamping devices with taper according to DIN 69871 are performed in form ADB unless otherwise noted.

    Form ADB means: The clamping devices are equipped with bores for form AD as well as for form B. Unless otherwise stipulated, the tool holders are delivered in form AD. The bores at the collar for form B are then sealed with plastic-dowels and secured with lock screws.


    For changing to form B, 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!

     

     

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