BT Series HDC High Precision Hydraulic Expansion Tool Holder

BT Series HDC High Precision Hydraulic Expansion Tool Holder

Hardened alloy steel hydraulic clamping tool holders with standard BT30/BT40/BT50 spindle taper, ultra-low radial runout hydraulic expansion design, complete bore size and length options, professional high-speed precision fixture for finish milling, deep precision drilling and graphite mold processing on CNC machining centers.
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Description

This BT-HDC Hydraulic Tool Holder is a high-performance CNC tool clamping component made of high-strength quenched alloy steel with full precision grinding finish. It adopts hydraulic expansion clamping technology to deliver ultra-stable rigid clamping and minimal runout, perfectly matching high-speed and high-precision cutting requirements of modern vertical machining centers.
  1. Ultra-low Runout Hydraulic Expansion Clamping
    Internal closed hydraulic oil chamber structure; tighten the side pressure screw to expand the inner clamping bore evenly, achieving full-surface fit with straight shank cutters. Radial runout ≤0.002mm at 3xD clamping length, effectively improving surface finish and extending cutter service life.
  2. Fully Ground Standard BT Taper Shank
    BT30, BT40 and BT50 tapers undergo hard precision grinding for perfect contact with machine spindle holes, providing excellent repeat positioning accuracy during automatic tool change and stable rigidity under high-speed rotation.
  3. Wear-resistant Hardened Alloy Steel Body
    The whole blank is integrally quenched and mirror polished with anti-rust treatment, resistant to deformation and abrasion under long-term continuous cutting, maintaining consistent clamping precision for mass production.
  4. Comprehensive Complete Size Series
    Covers three mainstream spindle tapers BT30, BT40, BT50; clamping inner diameter D1 ranges from 3mm to 32mm, with multiple overall length options (60L / 75L / 90L / 105L / 120L / 150L) for short heavy cutting and deep cavity long reach machining. M thread on the side supports through-coolant cutters.
  5. Wide Precision Machining Application
    Suitable for high-speed finish milling, deep precise hole drilling, small mold engraving, graphite electrode processing and thin-wall aerospace component machining, widely installed on vertical machining centers, engraving & 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, matches straight shank cutter 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 the complete tool holder
  5. L1: Effective fitting length of BT taper section
  6. L2min / L2max: Minimum and maximum insertion depth of cutter shank into hydraulic chuck
  7. M: Thread specification of side hydraulic oil injection / coolant screw (marked "-" means no thread)

Model Naming Rule

Format: BT[Taper]-HDC[Hydraulic Chuck Series]-[D1 Bore Dia]-[Total Length]L
Example: BT40-HDC12-90L
  • BT40: Standard BT40 machine spindle taper
  • HDC: Hydraulic expansion chuck series code
  • 12: Clamping inner 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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