BT tool holder

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Key Features

• High dynamic balance: balanced to G2.5 at 25,000 rpm; balanced to G1.0 at 60,000 rpm
• High precision: extra-long design; tool holder runout ≤0.001 mm; runout accuracy within 0.003 mm at 4×D
• High clamping force: clamping force approximately 2× DIN standard
• Corrosion-, wear- and rust-resistant: special surface treatment
• No distortion from heat treatment: key groove milled after heat treatment
• Long service life: up to 3000 clamping cycles with Conprofe Shrink-Fit Machine

Working Principle
Clamps the tool using thermal expansion and contraction. The tool holder is heated with a Shrink-Fit unit and the tool is inserted while the inner bore is expanded. After cooling, the holder contracts and grips the tool directly, without collets or nuts. This design provides high concentricity, dynamic balance and clamping rigidity suitable for high-speed machining.

Application Cases
Suitable for clamping a range of cutting tools in aerospace, semiconductor, medical and general industrial machining applications.

Technical Parameters
Item (Unit: mm) | Standard Type | Ultra Slim Type
Clamping diameter d | 4-10 | 4-10
D (outer diameter) | 10-22 | 7-13
D1 | 25-36 | 25-36
L (length) | 75-120 | 95-180
M | 22-67 | 42-97
Min. clamping length E | 12-30 | 12-30
Wall thickness t | 3-6 | 1.5

Specifications / Technical data

• Series: BT series
• Material: Stainless Steel (Standard)
• Clamping diameter d: 4–10 mm (both Standard and Ultra Slim)
• D (outer diameter): Standard 10–22 mm; Ultra Slim 7–13 mm
• D1: 25–36 mm (both types)
• L (length): Standard 75–120 mm; Ultra Slim 95–180 mm
• M: Standard 22–67 mm; Ultra Slim 42–97 mm
• Minimum clamping length E: 12–30 mm (both types)
• Wall thickness t: Standard 3–6 mm; Ultra Slim 1.5 mm
• Dynamic balance: G2.5 @ 25,000 rpm; G1.0 @ 60,000 rpm
• Runout: tool holder runout ≤0.001 mm; runout accuracy within 0.003 mm at 4×D
• Clamping force: approx. 2× DIN standard
• Durability: up to 3000 clamping cycles with Conprofe Shrink-Fit Machine
• Surface: special treatment for corrosion, wear and rust resistance