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BT x ER Tool Holders
TAPER TYPE: BT (MAS 403)
Japanese/International Standard - Most Common Worldwide
BT High-speed & Fine-balanced Tool Holders with ER Collet System. The most widely used taper type in machining centers worldwide. Excellent for general purpose machining with superior balance quality.
AVAILABLE CONFIGURATIONS
BT Taper Sizes
- BT30 - Smaller machines
- BT40 - Most common
- BT50 - Heavy duty
ER Collet Sizes
Multiple Lengths
Various gauge lengths available for different reach requirements
KEY BENEFITS
Compatible Accessories & Holders
Specifications
Material & Construction
Material: 20CrMnTi, Balance: ≤0.005mm, Max Speed: ≥12000rpm
Understanding ER Collet Grades: "A" vs "UM"
The letter suffix on ER collets (like ER20A or ER32UM) indicates the precision grade and balancing quality of the collet system.
Standard Grade
Reliable precision for everyday machining
- Precision Level: Standard runout tolerance (typically ≤0.008mm)
- Speed Rating: Suitable for speeds up to 12,000-15,000 RPM
- Applications: General machining, drilling, roughing operations
- Cost: Most economical option - excellent value for standard work
Ultra-precision, Micro-balanced
Premium grade for high-speed and finishing work
- Precision Level: Superior concentricity with runout <0.003mm (often <0.002mm)
- Speed Rating: Dynamically balanced for high-speed operations (20,000-30,000+ RPM)
- Applications: Finishing operations, high-speed milling, precision boring, micro-machining
- Benefits: Extended tool life, superior surface finish, reduced vibration at high RPM
Selection Tip: Choose A-grade for general-purpose work and cost efficiency. Upgrade to UM-grade when you need exceptional surface finish, tight tolerances, or are running high-speed operations above 15,000 RPM.
Tool Holder Type Guide
Different types (A, B, C, D, E) represent variations in material quality, precision grade, and speed capability to match your application requirements.
| Type | Material | Precision | Speed Rating | Best For |
|---|---|---|---|---|
| A | Standard Steel | Standard (General use) |
≤12,000 RPM | General machining, conventional operations |
| B | Heat-Treated Alloy | High (Tighter tolerances) |
≤15,000 RPM | Precision machining, better surface finish |
| C | Premium Alloy | High Precision (Low runout) |
≤18,000 RPM | High-speed operations, fine finish work |
| D | Hardened Alloy | Ultra Precision (Minimal runout) |
≤20,000 RPM | High-precision aerospace, mold making |
| E | Special Coating | Standard+ (Corrosion resistant) |
≤12,000 RPM | Harsh environments, extended tool life |
Recommendation: Type A (Standard) is used in most industrial applications and is suitable for general machining operations. Choose Type A if you're unsure about your specific requirements - it provides excellent performance for the majority of CNC work.
Note: All types share the same physical dimensions. The variation is in material quality, manufacturing precision, and dynamic balancing specifications.
BT x ER Tool Holders
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
h
b
H
F
L
L1
f
Insert
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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