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BT Shrink Fit Tool Holder
BT TAPER + THERMAL SHRINK CLAMPING
Premium Precision for BT Spindle Machines
High-precision BT shrink fit tool holder with 360° thermal clamping for high-speed machining. Combines the worldwide BT taper standard with shrink fit technology for exceptional concentricity and balance. Perfect for precision finishing on BT spindle machines.
HOW SHRINK FIT WORKS
Heat holder bore with shrink unit
Bore expands from heat
Insert tool shank
Cool = 360° grip
AVAILABLE CONFIGURATIONS
BT Taper Sizes
- BT30 - Smaller machines
- BT40 - Most common
- BT50 - Heavy duty
Bore Diameters
Gauge Lengths
Multiple L1 lengths available
From short to extended reach
REQUIRES SHRINK FIT UNIT
Shrink fit holders require a thermal shrink unit (induction heater) for tool changes. The holder is heated to expand the bore, then cooled to grip the tool. This is not a quick-change system but provides the highest precision available.
KEY BENEFITS
Product Information
What is a Shrink Fit Tool Holder?
A shrink fit (or heat shrink) tool holder uses thermal expansion to grip cutting tools. The holder is heated, causing the bore to expand slightly. The tool is inserted, and as the holder cools, it contracts around the tool shank creating an extremely strong, concentric grip.
How Shrink Fit Clamping Works
- Heat the holder - Use an induction heating unit to heat the holder bore
- Bore expands - The heated metal expands, enlarging the bore diameter
- Insert the tool - Slide the cutting tool into the expanded bore
- Cool and contract - As the holder cools, it shrinks around the tool with extreme force
Key Advantages
- • 360° uniform clamping - Full-circle grip for perfect concentricity
- • Extreme accuracy - Runout ≤0.002mm
- • Excellent dynamic balance - G2.5 at 25000RPM
- • No additional components - Clean, symmetrical design
- • High rigidity - Strong and stable tool clamping
- • High-speed capable - Ideal for HSM applications
Specifications
- • Material: 20CrMnTi Steel
- • Hardness: HRC55-58
- • Runout Accuracy: ≤0.002mm
- • Dynamic Balance: G2.5 at 25000RPM
Available Tool Diameters
- • Ø4mm, Ø6mm, Ø8mm, Ø10mm, Ø12mm
- • Ø14mm, Ø16mm, Ø18mm, Ø20mm, Ø25mm
Specifications
Material & Construction
Material: 20CrMnTi, Hardness: HRC55-58, Accuracy: ≤0.002mm, Dynamic Balance: G2.5 25000RPM
BT Shrink Fit Tool Holder
Select Specifications
φ(d)=Cutting Diameter | R=Radius | D=Shank Diameter | I=Cutting Length | L=Overall Length | All in mm
D=Diameter | L1, L2, L3=Length Dimensions | L=Overall Length | D1=Shank Diameter | All in mm
Select blade width, groove depth (T), and working radius range to find the right Face Groove tool
Select boring diameter range, shank diameter (D), and insert type (C=diamond/T=triangular) to find the right boring head
Select CBA model (complete boring range) and internal boring range to find the right micro finish boring head
Select LBK model (matches your CBA boring head) and extension length to find the right extension rod
Select BT type (spindle taper), LBK number (locking block socket), CBA head model, and projection length (L1) to find the right boring head shank
How to Choose the Right Holder
- Shank Height (H): Choose based on your machine's tool holder/turret slot size
- Tool Height (H3): Must match the H dimension of your SPB Tool (26mm or 32mm)
Example: If you have SPB26-3 tool (H=26mm), select H3=26mm
Must match your SPB Tool's H dimension
HRC≤56 is recommended for best price/performance ratio with newest nano-black coating technology.
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SKU / Article Number
Price per piece
€
€
30% Discounted price
D (Diameter)
L1
L2
L3
L (Overall)
D1
Insert Code
Insert Count
BT Model
D (Inner Ø)
L (Total)
A (Overall)
B
Blade Width
Blade Height
Groove Depth
Orientation
Working Radius Range
Compatible Inserts
φ(d)
R
D
I
L
Morse #
H7 Tolerance
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