ER HYDRAULIC TOOL HOLDER

ER HYDRAULIC TOOL HOLDER

Hardened alloy steel hydraulic conversion adapters with standard ER25 & ER32 outer taper, ultra-low runout hydraulic inner clamping bore design. It converts common ER tool holders into high-rigidity hydraulic clamping fixtures, ideal for precision deep-hole drilling and high-speed finish milling on CNC machining centers and engraving machines.
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Description

This ER-HDC hydraulic adapter is a precision conversion component specially designed for ER series tool holders, manufactured from high-strength quenched alloy steel with full precision grinding and black anti-wear coating. It installs directly into standard ER collet chucks to upgrade ordinary elastic collet clamping to high-precision hydraulic expansion clamping, drastically reducing radial runout and boosting cutting stability.
  1. Ultra-precise Hydraulic Expansion Clamping Inner Bore
    Built-in closed hydraulic oil chamber inside the adapter body; tighten the side pressure screw to evenly expand the inner bore for full-surface close fit with straight-shank cutters. Radial runout ≤0.002mm at 3xD clamping length, delivering superior workpiece surface finish and extending carbide tool service life.
  2. Standard ER Outer Taper Fully Hard-ground
    Two mainstream outer taper specifications ER25 and ER32 are fully precision hard-ground, perfectly matching standard ER collet chucks of the same model. Simple plug-and-play installation without modifying existing tool holders.
  3. Wear-resistant Hardened Alloy Steel Body
    The whole blank undergoes integral quenching treatment with matte black anti-rust wear-resistant coating, resisting abrasion and deformation under long-term continuous high-speed cutting, maintaining consistent clamping precision for mass production.
  4. Compact Unified Length Design
    All models adopt a unified overall length of 75L for easy length calculation during programming; clamping bore D1 covers 6mm to 20mm, compatible with most common straight-shank drills, end mills and reamers.
  5. Wide Precision Machining Application
    Suitable for high-precision deep hole drilling, mold finish milling, graphite electrode machining and thin-wall component processing, widely used on vertical machining centers, engraving & milling machines and small CNC drilling equipment.

Complete Dimension Specification Table (Unit: mm)

Model D1 D2 L L2min L2max Price
ER25-HDC06-75L 6 52 75 28 44.5 —
ER25-HDC08-75L 8 52 75 28 44.5 —
ER25-HDC10-75L 10 52 75 37 51 —
ER25-HDC12-75L 12 52 75 37 64 —
ER25-HDC16-75L 16 52 75 40 64 —
ER25-HDC20-75L 20 52 75 40 64 —
ER32-HDC06-75L 6 60 75 28 44.5 —
ER32-HDC08-75L 8 60 75 28 44.5 —
ER32-HDC10-75L 10 60 75 37 51 —
ER32-HDC12-75L 12 60 75 37 51 —
ER32-HDC16-75L 16 60 75 40 65 —
ER32-HDC20-75L 20 60 75 40 65 —

Parameter Explanation

  1. D1: Inner hydraulic clamping bore diameter, matching straight shank cutter diameter
  2. D2: Outer diameter of hydraulic adapter main body
  3. L: Total overall length of the complete ER-HDC adapter
  4. L2min / L2max: Minimum & maximum insertion depth of cutter shank into hydraulic clamping bore

Model Naming Rule

Format: ER[ER Taper Size]-HDC[Hydraulic Chuck Series]-[D1 Clamping Bore Dia]-[Total Length]L
Example: ER25-HDC10-75L
  • ER25: Standard ER25 outer taper for ER collet chuck
  • HDC: Hydraulic expansion chuck adapter series code
  • 10: Inner clamping bore D1 = 10mm
  • 75L: Total overall length L = 75mm

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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