BT50 Series Heavy-Duty ER Collet Chuck Tool Holder

BT50 Series Heavy-Duty ER Collet Chuck Tool Holder

High-precision BT50 taper ER collet chucks with G2.5 dynamic balance, available in 80L-600L extra-long lengths and ER16-ER50 sizes, designed for heavy-duty milling and deep-cavity machining on BT50 CNC machining centers.
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Description

BT50 series heavy-duty ER collet chucks are manufactured from high-strength alloy steel with overall vacuum quenching and precision grinding, the ideal tool holders for heavy-load machining applications on BT50 spindle CNC machining centers.
  1. Ultra-precision machining ensures ≤0.005mm runout accuracy at 4×D from the chuck face, delivering exceptional machining precision and surface finish even under heavy cutting loads.
  2. G2.5 grade dynamic balance up to 15,000 RPM minimizes vibration at high speeds, extending tool life and improving machining efficiency.
  3. Comprehensive size range supports ER16, ER20, ER25, ER32, ER40 and ER50 collets, covering tool diameters from 1mm to 36mm.
  4. Multiple length options (80L-600L) accommodate various deep-cavity machining requirements and complex workpiece geometries.
  5. Standard 7/24 taper design is 100% compatible with all mainstream BT50 spindle CNC machine tools.
  6. Black oxide surface treatment provides excellent corrosion resistance and long-term durability in harsh industrial environments.

Complete Specification Table (Unit: mm)

Model L L1 L2 L3 d1 d2 d3 FIG Weight Price
BT50-ER16-80L 171.8 80 42 38 28 16 28 1 3.8KG
BT50-ER16-100L 201.8 100 62 38 28 16 28 1 3.9KG
BT50-ER16-150L 251.8 150 112 38 28 16 28 1 4.2KG
BT50-ER16-200L 301.8 200 162 38 28 16 28 1 4.3KG
BT50-ER16-250L 351.8 250 212 38 28 16 31 2 4.7KG
BT50-ER16-300L 401.8 300 262 38 28 16 33 2 5.5KG
BT50-ER16-350L 451.8 350 312 38 28 16 35 2 6.3KG
BT50-ER20-80L 181.8 80 42 38 34 20 34 1 3.8KG
BT50-ER20-100L 201.8 100 62 38 34 20 34 1 4.0KG
BT50-ER20-150L 251.8 150 112 38 34 20 34 1 4.3KG
BT50-ER20-200L 301.8 200 162 38 34 20 34 1 4.6KG
BT50-ER20-250L 351.8 250 212 38 34 20 37 2 5.0KG
BT50-ER20-300L 401.8 300 262 38 34 20 39 2 5.45KG
BT50-ER20-350L 451.8 350 312 38 34 20 41 2 5.1KG
BT50-ER20-400L 501.8 400 362 38 34 20 43 2 6.4KG
BT50-ER25-80L 181.8 80 42 38 42 25 42 1 4.0KG
BT50-ER25-100L 201.8 100 62 38 42 25 42 1 4.1KG
BT50-ER25-150L 251.8 150 112 38 42 25 42 1 4.6KG
BT50-ER25-200L 301.8 200 162 38 42 25 42 1 5.1KG
BT50-ER25-250L 351.8 250 212 38 42 25 45 2 5.8KG
BT50-ER25-300L 401.8 300 262 38 42 25 47 2 6.2KG
BT50-ER25-350L 451.8 350 312 38 42 25 49 2 7.0KG
BT50-ER25-400L 501.8 400 362 38 42 25 51 2 7.8KG
BT50-ER32-80L 181.8 80 42 38 50 32 50 1 3.9KG
BT50-ER32-100L 201.8 100 62 38 50 32 50 1 4.2KG
BT50-ER32-150L 251.8 150 112 38 50 32 50 1 4.9KG
BT50-ER32-200L 301.8 200 112 38 50 32 50 1 5.7KG
BT50-ER32-250L 351.8 250 212 38 50 32 50 1 6.5KG
BT50-ER32-300L 401.8 300 262 38 50 32 53 2 7.2KG
BT50-ER32-350L 451.8 350 312 38 50 32 54 2 8.0KG
BT50-ER32-400L 501.8 400 362 38 50 32 56 2 8.9KG
BT50-ER32-450L 551.8 450 412 38 50 32 58 2 11.5KG
BT50-ER32-500L 601.8 500 462 38 50 32 60 2 12.5KG
BT50-ER32-550L 651.8 550 512 38 50 32 65 2 15.0KG
BT50-ER32-600L 701.8 600 562 38 50 32 68 2 16.0KG
BT50-ER40-80L 186.8 80 42 38 63 40 63 1 4.7KG
BT50-ER40-100L 201.8 100 62 38 63 40 63 1 5.2KG
BT50-ER40-150L 251.8 150 112 38 63 40 63 1 6.5KG
BT50-ER40-200L 301.8 200 162 38 63 40 63 1 7.5KG
BT50-ER40-250L 351.8 250 212 38 63 40 63 1 8.6KG
BT50-ER40-300L 401.8 300 262 38 63 40 66 2 9.8KG
BT50-ER40-350L 451.8 350 312 38 63 40 67 2 11.5KG
BT50-ER40-400L 501.8 400 362 38 63 40 70 2 13.5KG
BT50-ER40-450L 551.8 450 412 38 63 40 72 2 14.0KG
BT50-ER40-500L 601.8 500 462 38 63 40 73 2 16.5KG
BT50-ER40-550L 651.8 550 512 38 63 40 75 2 18.5KG
BT50-ER40-600L 701.8 600 562 38 63 40 78 2 21.0KG
BT50-ER50-100L 201.8 100 62 38 78 50 78 1 3.9KG
BT50-ER50-150L 251.8 150 112 38 78 50 78 1 6.2KG
BT50-ER50-200L 301.8 200 162 38 78 50 78 1 7.8KG

Parameter Explanation

  • L/L1/L2/L3/d1/d2/d3 : Overall and mounting dimensions (unit: mm), corresponding to the engineering drawing
  • FIG : Structural type identifier (1=standard type, 2=reinforced type for longer lengths)
  • Weight : Net weight per unit (unit: KG)
  • Model Naming :
    • BT50: 7/24 taper spindle interface standard
    • ERXX: Matching ER collet series (e.g., ER32)
    • XXL: Total length of the tool holder (e.g., 300L = 300mm 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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