JIS_6339

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Shank Detail

Machine Design

The spindle interface JIS B 6339-2 as the traditional interface for milling spindles distinguishes itself through its 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 JIS B 6339-2 interface is primarily suitable for applications with a spindle speed of up to 12,000 rpm.

Tool holders are manufactured from the base material of case-hardened 60 – 2 HRC. Tensile strength in the core at least 950 N/mm2. Tolerance quality AT3 is achieved in the Steep Taper. Angle of the cone in the taper is 8° 17'50'' +4''. The holder is manufactured without a bore for the data chip. Interior coolant supply is designed through the centre as per the Form JD.

Form AD & AD/B

JIS-6339 Shank
Machine Design TAPER ISO D D1 D2 L1 L2 L3 d. B G e1
BT30 30 31.75 46.0 56.14 48.4 13.6 22 8 16.1 M12 20
BT35 35 38.1 53.0 61.97 56.4 14.6 24 9 16.1 M12 -
BT40 40 44.45 63.0 75.68 65.4 16.6 27 10 16.1 M16 27
BT50 50 69.85 100.0 119.02 101.8 23.2 38 15 25.7 M24 42

Pre balanced G6.3@15000 RPM
Fine balancing G2.5@25000 RPM on request

 

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