BT Taper Hydraulic Expansion Tool Chuck for Automatic Tool Change CNC Vertical Mills

Integrally quenched alloy steel hydraulic clamping chucks with standard BT30 / BT40 / BT50 machine spindle taper, built-in fully sealed hydraulic expansion structure with ultra-low radial runout, mirror-finished anti-vibration body. Compatible with all BT automatic tool change vertical machining centers, ideal for high-precision mold finish milling, deep precise drilling and small precision component cutting.

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Hydraulic Tool Holder

Products

Description

This BT-HDC hydraulic tool chuck is a high-precision clamping fixture customized for BT-spindle vertical CNC machining centers, forged from high-strength quenched alloy steel with full hard grinding and mirror polishing finish. The built-in closed hydraulic oil chamber enables uniform elastic clamping on straight-shank cutters, achieving ultra-low radial runout and stable clamping rigidity to optimize workpiece surface finish and extend carbide tool service life.

Fully Hard-ground Standard BT Spindle Taper

BT30, BT40 and BT50 tapers undergo complete precision hard grinding for seamless contact with machine spindle taper holes. It delivers stable repeat positioning accuracy during automatic tool change, compatible with nearly all mainstream vertical CNC milling machines with BT spindles.
Closed Hydraulic Expansion Ultra-low Runout Clamping Core

A fully sealed hydraulic cavity is integrated inside the chuck body. Tighten the side hex pressure screw to expand the inner clamping bore evenly for full-surface fit with tool shanks. Radial runout is controlled ≤0.002mm at the 3xD clamping length, eliminating cutter vibration and surface chatter marks during high-speed finish cutting.
Hardened Anti-deformation Alloy Steel Main Body

The whole blank receives integral quenching heat treatment, with mirror polishing and anti-rust protective coating on outer surfaces. It resists abrasion and permanent deformation under long continuous cutting loads, maintaining consistent ultra-precision clamping performance for mass production.
Complete Full-size Standard Series

Covers three mainstream spindle tapers BT30, BT40 and BT50. Inner clamping bore D1 ranges from 3mm to 32mm, with multiple overall length specifications (60L / 75L / 90L / 105L / 120L / 150L). Short stubby variants offer maximum rigidity for combined rough & finish cutting; long extended versions serve deep narrow cavity mold machining. Reserved M threads on the side support through-coolant cutting tools.
Wide Universal CNC Machining Application

Perfectly matched with all BT automatic tool change vertical machining centers, widely applied in mold high-speed finish milling, precise deep hole drilling, graphite electrode processing, automotive structural parts and ultra-precision 3C hardware component manufacturing.

Dimension Specification Note

Only a single horizontal finished product render is provided in this material. The complete standardized dimensional parameter table (including D1 clamping bore diameter, D2 chuck outer diameter, L total length, M pressure screw thread specification) can be supplied separately upon customer request.

Model Naming Rule

Standard format:


            BT[Taper Size]-HDC[Hydraulic Chuck Series]-[D1 Clamping Bore Diameter]-[Total Length]L

Example: BT40-HDC12-90L

BT40: Standard BT40 CNC machine spindle taper
HDC: Hydraulic expansion chuck series code
12: Inner hydraulic 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.