BT Series C-Style Power Milling Chuck Tool Holder - BT30/BT40/BT50

BT Series C-Style Power Milling Chuck Tool Holder - BT30/BT40/BT50

High-rigidity BT taper C-style power milling chucks with 3-5x higher clamping force than standard ER chucks, available in C20-C42 sizes and multiple lengths, ideal for heavy-duty roughing and high-speed milling operations.
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Description

BT series C-style power milling chucks are manufactured from high-strength alloy steel with overall vacuum quenching and precision grinding, the premium tool holding solution for heavy-load roughing and high-speed milling applications on BT spindle CNC machining centers.
  1. Unique multi-segment collet design delivers 3-5 times higher clamping force than standard ER collet chucks, completely eliminating tool slippage even under the most demanding heavy cutting loads.
  2. Ultra-precision machining ensures ≤0.005mm runout accuracy at 4×D from the chuck face, delivering exceptional machining precision and surface finish.
  3. G2.5 grade dynamic balance up to 20,000 RPM minimizes vibration at high speeds, extending tool life and improving machining efficiency.
  4. Comprehensive size range supports C20, C25, C32 and C42 collet systems, covering tool diameters from 3mm to 42mm, with multiple length options to accommodate various machining depths.
  5. Standard 7/24 taper design is 100% compatible with all mainstream BT30, BT40 and BT50 spindle CNC machine tools.
  6. Black oxide and nickel plating surface treatments provide excellent corrosion resistance and long-term durability in harsh industrial environments.

Complete Specification Table (Unit: mm)

BT30 Series Power Milling Chucks

Model L L1 L2 L3 D d1 d2 Clamping Range Weight Price
BT30-C20-80 128.4 80 58 22 46 20 56 3 4 5 6 8 10 12 14 16 20 1.3KG
BT30-C25-100 148.4 100 78 22 46 25 61 3 4 5 6 8 10 12 14 16 18 20 25 1.6KG
BT30-C32-105 153.4 105 83 22 46 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 2.3KG

BT40 Series Power Milling Chucks

Model L L1 L2 L3 D d1 d2 Clamping Range Weight Price
BT40-C20-100 165.4 100 73 27 63 20 56 3 4 5 6 8 10 12 14 16 18 14 20 2.0KG
BT40-C25-100 165.4 100 73 27 63 25 61 3 4 5 6 8 10 12 14 16 18 20 25 2.2KG
BT40-C25-135 200.4 135 108 27 63 25 61 3 4 5 6 8 10 12 14 16 18 20 25 3.1KG
BT40-C32-105 170.4 105 78 27 63 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 2.5KG
BT40-C32-135 200.4 135 108 27 63 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 3.1KG
BT40-C32-165 230.4 165 138 27 63 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 3.9KG
BT40-C32-200 265.4 200 173 27 63 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 4.6KG
BT40-C32-250 315.4 250 223 27 63 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 5.7KG
BT40-C42-130 195.4 130 103 27 63 42 87 3 4 5 6 8 10 12 14 16 18 20 22 24 25 28 30 32 34 36 42

BT50 Series Power Milling Chucks

Model L L1 L2 L3 D d1 d2 Clamping Range Weight Price
BT50-C25-110 211.8 110 72 38 100 25 61 3 4 5 6 8 10 12 14 16 18 20 25 4.8KG
BT50-C25-165 236.8 165 127 38 100 25 61 3 4 5 6 8 10 12 14 16 18 20 25 6.1KG
BT50-C32-110 211.8 110 72 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 5.3KG
BT50-C32-135 236.8 135 97 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 6.0KG
BT50-C32-165 266.8 165 127 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 6.9KG
BT50-C32-200 301.8 200 162 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 7.8KG
BT50-C32-250 351.8 250 212 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 9.45KG
BT50-C32-300 401.8 300 262 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 11.75KG
BT50-C32-350 451.8 350 312 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32 12.3KG
BT50-C32-400 501.8 400 362 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32
BT50-C32-450 551.8 450 412 38 100 32 68 3 4 5 6 8 10 12 14 16 18 20 22 24 25 32
BT50-C42-135 236.8 135 97 38 100 42 87 3 4 5 6 8 10 12 14 16 18 20 22 24 25 28 30 32 34 36 42 6.2KG
BT50-C42-165 266.8 165 127 38 100 42 87 3 4 5 6 8 10 12 14 16 18 20 22 24 25 28 30 32 34 36 42 7.6KG
BT50-C42-200 301.8 200 162 38 100 42 87 3 4 5 6 8 10 12 14 16 18 20 22 24 25 28 30 32 34 36 42 9.0KG

Parameter Explanation

  • L/L1/L2/L3/D/d1/d2 : Overall and mounting dimensions (unit: mm), corresponding to the engineering drawing
  • Clamping Range : Complete range of tool shank diameters that the chuck can hold
  • Weight : Net weight per unit (unit: KG)
  • Model Naming :
    • BTXX: 7/24 taper spindle interface standard (BT30/BT40/BT50)
    • CYY: C-style power chuck series, YY indicates the maximum clamping diameter (C20/C25/C32/C42)
    • ZZ: Total length of the tool holder (e.g., 100 = 100mm length)

Applications

CNC Machining

Ideal for CNC lathe, milling and machining center operations, ensuring high-precision dimensional control and reliable tool holding for mass production.

Quality Control Labs

Suitable for quality inspection departments and calibration labs, providing accurate measurement data to verify product compliance with ISO and industry standards.

Mold & Die Making

Perfect for mold and die workshops, where micron-level precision tools and gauges are essential for complex cavity machining and final inspection.

OEM/ODM Projects

Customizable solutions for OEM and ODM manufacturing partners, offering tailored measuring tools and CNC accessories to meet unique production requirements.

Automotive Manufacturing

Designed for automotive component production lines, ensuring consistent precision and durability in engine parts, transmission components and assembly processes.

Aerospace & Precision Engineering

Ideal for aerospace and defense manufacturing, where ultra-high precision instruments and reliable tool holders meet strict quality and safety requirements.

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