BT Series HDC Hydraulic Tool Holder (High Precision Hydraulic Chuck for CNC Milling & Drilling)

BT Series HDC Hydraulic Tool Holder (High Precision Hydraulic Chuck for CNC Milling & Drilling)

Ultra-precision hydraulic clamping tool holders with BT30 / BT40 / BT50 standard machine spindle taper, zero-runout hydraulic expansion clamping structure, abundant clamping bore sizes and overall length options, dedicated high-speed fixture for finish milling, deep hole drilling and graphite mold machining on CNC machining centers.
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Description

This BT-HDC Hydraulic Tool Holder is a high-performance CNC tool clamping component manufactured from high-strength alloy steel via overall quenching and precision grinding process. It adopts hydraulic expansion clamping principle to deliver ultra-low radial runout, stable rigid clamping and excellent vibration damping, perfectly matching high-precision and high-speed cutting demands of modern machining centers.
  1. Zero-Runout Hydraulic Expansion Clamping Mechanism
    Built-in hydraulic oil chamber inside the chuck body; inject hydraulic oil through the side pressure screw to uniformly expand the precision inner bore, realizing full-surface close clamping on tool shanks. Radial runout ≤0.002mm at 3xD clamping length, greatly improving workpiece surface finish and tool service life.
  2. Standard BT Taper Shank Full Grinding Process
    BT30 / BT40 / BT50 spindle taper undergoes complete hard grinding, achieving perfect fit with machine spindle taper hole, high repeat positioning accuracy during automatic tool change, stable clamping rigidity under high spindle rotation speed.
  3. Hardened Alloy Steel Wear-resistant Body
    The whole tool blank adopts 40Cr alloy steel with overall quenching treatment, surface mirror polishing and anti-rust coating, resisting wear and deformation under long-term high-load cutting, maintaining consistent clamping precision for long-term mass production.
  4. Rich Complete Size Series
    Covers three mainstream spindle tapers BT30, BT40 and BT50; clamping bore D1 ranges from 3mm to 32mm, multiple overall length L specifications (60L / 75L / 90L / 105L / 120L / 150L) for short stubby heavy cutting and long deep cavity machining scenarios. Each model reserves coolant screw thread M for through-coolant cutting tools.
  5. Wide Precision Machining Application
    Specially used for high-speed finish milling, deep precise hole drilling, small mold engraving, graphite electrode processing and aerospace thin-wall part machining, widely equipped on vertical machining centers, engraving and milling machines and automatic CNC milling equipment.

Complete Dimension Specification Table (Unit: mm)

Model D1 D2 D3 L L1 L2min L2max M Price
BT30-HDC03-60L 3 21 45 60 29 23 84 - —
BT30-HDC04-60L 4 21 45 60 29 23 84 - —
BT30-HDC06-75L 6 30 46 75 24 28 50 M5 —
BT30-HDC08-75L 8 32 46 75 24 28 50 M6 —
BT30-HDC10-75L 10 34 46 75 24 34 50 M8 —
BT30-HDC12-75L 12 36 46 75 25 36 50 M8 —
BT30-HDC14-90L 14 38 46 90 40 41 52 M8 —
BT30-HDC16-90L 16 40 46 90 41 41 52 M8 —
BT30-HDC18-90L 18 42 46 90 41 41 52 M8 —
BT30-HDC20-90L 20 46 46 90 41 41 52 M8 —
BT40-HDC04-90L 4 28 46 90 38 24 42 - —
BT40-HDC06-90L 6 30 46 90 38 28 44 M5 —
BT40-HDC08-90L 8 32 48 90 38 28 44 M6 —
BT40-HDC10-90L 10 36 52 90 40 37 51 M8 —
BT40-HDC12-90L 12 38 54 90 40 37 51 M8 —
BT40-HDC14-90L 14 40 56 90 40 41 52 M12 —
BT40-HDC16-90L 16 42 58 90 40 41 52 M12 —
BT40-HDC18-90L 18 43 59 90 40 41 52 M12 —
BT40-HDC20-90L 20 46 60 90 40 41 53 M12 —
BT40-HDC25-105L 25 52 62 105 55 49 65 M12 —
BT40-HDC32-105L 32 63 — 105 — 52 65 M12 —
BT50-HDC06-150L 6 30 46 150 38 28 44 M5 —
BT50-HDC08-150L 8 32 48 150 38 28 44 M6 —
BT50-HDC10-150L 10 36 52 150 40 37 51 M8 —
BT50-HDC12-150L 12 38 54 150 40 37 51 M8 —
BT50-HDC14-150L 14 40 56 150 40 41 52 M12 —
BT50-HDC16-150L 16 42 58 150 40 41 52 M12 —
BT50-HDC18-150L 18 43 59 150 39 40 51 M12 —
BT50-HDC20-150L 20 46 60 150 40 41 53 M12 —
BT50-HDC25-150L 25 52 62 150 55 49 65 M12 —
BT50-HDC32-150L 32 63 72 150 56 52 65 M12 —
BT50-HDC06-105L 6 30 46 105 38 28 44 M5 —
BT50-HDC08-105L 8 32 48 105 38 28 44 M6 —
BT50-HDC10-105L 10 36 52 105 40 37 51 M8 —
BT50-HDC12-105L 12 38 54 105 40 37 51 M8 —
BT50-HDC14-105L 14 40 56 105 40 41 52 M12 —
BT50-HDC16-105L 16 42 58 105 40 41 52 M12 —
BT50-HDC18-105L 18 43 59 105 39 40 51 M12 —
BT50-HDC20-105L 20 46 60 105 40 41 53 M12 —
BT50-HDC25-120L 25 52 62 120 55 49 65 M12 —
BT50-HDC32-120L 32 63 72 120 56 52 65 M12 —

Parameter Explanation

  1. D1: Inner clamping bore diameter, matching corresponding straight shank tool diameter
  2. D2: Outer diameter of hydraulic chuck main body
  3. D3: Flange outer diameter of BT taper shank
  4. L: Overall total length of complete tool holder
  5. L1: Effective length of BT taper fitting section
  6. L2min / L2max: Minimum & maximum insertion depth range of cutting tool shank into hydraulic chuck
  7. M: Thread specification of side hydraulic oil injection / coolant screw (no thread marked as "-")

Model Naming Rule

Format: BT[Spindle Taper]-HDC[Hydraulic Chuck]-[D1 Clamping Bore Dia]-[Total Length]L
Example: BT40-HDC12-90L
  • BT40: Standard BT40 machine spindle taper
  • HDC: Series code for hydraulic expansion chuck
  • 12: Clamping bore D1 = 12mm
  • 90L: Overall total length L = 90mm

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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