BT Series FMA Face Mill Arbor Tool Holder (Inch Series) - BT30/BT40/BT50

BT Series FMA Face Mill Arbor Tool Holder (Inch Series) - BT30/BT40/BT50

High-rigidity BT taper inch-series face mill arbors with G2.5 dynamic balance, available in FMA25.4-FMA50.8 (1"-2") sizes and multiple lengths, designed for face milling operations with inch-standard cutters on BT spindle CNC machining centers.
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Description

BT series FMA inch-series face mill arbors are manufactured from high-strength alloy steel with overall vacuum quenching and precision grinding, the dedicated tool holders for mounting inch-standard face milling cutters on BT spindle CNC machining centers.
  1. High-rigidity one-piece construction delivers exceptional stability and vibration damping, ensuring excellent surface finish and extended tool life even under heavy cutting loads.
  2. Ultra-precision machining ensures ≤0.005mm runout accuracy at the cutter mounting face, delivering consistent machining precision.
  3. G2.5 grade dynamic balance minimizes vibration at high speeds, improving machining efficiency and reducing tool wear.
  4. Comprehensive size range supports FMA25.4 (1"), FMA31.75 (1-1/4"), FMA38.1 (1-1/2") and FMA50.8 (2") inch-standard cutter mounting diameters, with multiple length options to accommodate various machining depths.
  5. Integrated through-coolant design delivers high-pressure coolant directly to the cutting edge for optimal chip evacuation and cooling performance.
  6. Standard 7/24 taper design is 100% compatible with all mainstream BT30, BT40 and BT50 spindle CNC machine tools.

Complete Specification Table (Unit: mm)

BT30 Series Inch Face Mill Arbors

Model L L1 L2 L3 L4 D d1 d2 K1 K2 FIG Weight Price
BT30-FMA25.4-45 113.4 45 23 22 20 46 50 25.4 4.52 9.52 1 1.1
BT30-FMA25.4-60 128.4 60 38 22 20 46 50 25.4 4.52 9.52 1 1.3
BT30-FMA31.75-45 115.4 45 23 22 22 46 60 31.8 6.7 12.7 1 1.35
BT30-FMA31.75-60 130.4 60 38 22 22 46 60 31.8 6.7 12.7 1 1.5

BT40 Series Inch Face Mill Arbors

Model L L1 L2 L3 L4 D d1 d2 K1 K2 FIG Weight Price
BT40-FMA25.4-45 145.4 45 33 27 20 63 50 25.4 4.52 9.52 1 1.5
BT40-FMA25.4-100 185.4 100 73 27 20 63 50 25.4 4.52 9.52 1 2.05
BT40-FMA25.4-150 235.4 150 123 27 20 63 50 25.4 4.52 9.52 1 2.75
BT40-FMA25.4-200 285.4 200 173 27 20 63 50 25.4 4.52 9.52 1 3.6
BT40-FMA31.75-60 147.4 60 33 27 22 63 60 31.8 6.7 12.7 1 2.05
BT40-FMA31.75-100 187.4 100 73 27 22 63 60 31.8 6.7 12.7 1 2.9
BT40-FMA31.75-150 237.4 150 123 27 22 63 60 31.8 6.7 12.7 1 4.1
BT40-FMA38.10-60 150.4 60 33 27 25 63 75 38.1 8.87 15.9 2 2.1
BT40-FMA38.10-100 190.4 100 73 27 25 63 75 38.1 8.87 15.9 2 2.95
BT40-FMA50.80-60 161.4 60 33 27 36 63 98 50.8 9.75 19.1 2 4.5

BT50 Series Inch Face Mill Arbors

Model L L1 L2 L3 L4 D d1 d2 K1 K2 FIG Weight Price
BT50-FMA25.4-60 181.8 60 22 38 20 100 50 25.4 4.52 9.52 / 4.5
BT50-FMA25.4-100 221.8 100 62 38 20 100 50 25.4 4.52 9.52 / 4.8
BT50-FMA25.4-150 271.8 150 112 38 20 100 50 25.4 4.52 9.52 / 6.05
BT50-FMA25.4-200 321.8 200 162 38 20 100 50 25.4 4.52 9.52 / 6.9
BT50-FMA25.4-250 371.8 250 212 38 20 100 50 25.4 4.52 9.52 / 8.4
BT50-FMA25.4-300 421.8 300 262 38 20 100 50 25.4 4.52 9.52 / 9.5
BT50-FMA25.4-350 471.8 350 312 38 20 100 50 25.4 4.52 9.52 / 10.5
BT50-FMA25.4-400 521.8 400 362 38 20 100 50 25.4 4.52 9.52 / 12
BT50-FMA25.4-450 571.8 450 412 38 20 100 50 25.4 4.52 9.52 / 13.5
BT50-FMA25.4-500 621.8 500 462 38 20 100 50 25.4 4.52 9.52 / 15
BT50-FMA31.75-60 183.8 60 22 38 22 100 60 31.8 6.7 12.7 / 4.65
BT50-FMA31.75-100 223.8 100 62 38 22 100 60 31.8 6.7 12.7 / 5.6
BT50-FMA31.75-150 273.8 150 112 38 22 100 60 31.8 6.7 12.7 / 7.85
BT50-FMA31.75-200 323.8 200 162 38 22 100 60 31.8 6.7 12.7 / 9.75
BT50-FMA31.75-250 373.8 250 212 38 22 100 60 31.8 6.7 12.7 / 12
BT50-FMA31.75-300 423.8 300 262 38 22 100 60 31.8 6.7 12.7 / 15
BT50-FMA31.75-350 473.8 350 312 38 22 100 60 31.8 6.7 12.7 / 18
BT50-FMA38.10-60 186.8 60 22 38 25 100 75 38.1 8.87 15.9 / 5.5
BT50-FMA38.10-100 226.8 100 62 38 25 100 75 38.1 8.87 15.9 / 6.7
BT50-FMA38.10-150 276.8 150 112 38 25 100 75 38.1 8.87 15.9 / 7.5
BT50-FMA38.10-200 326.8 200 162 38 25 100 75 38.1 8.87 15.9 / 10.75
BT50-FMA38.10-75 212.8 75 37 38 25 100 98 50.8 9.75 19.1 / 6.4
BT50-FMA50.80-80 237.8 100 62 38 36 100 98 50.8 9.75 19.1 / 7
BT50-FMA50.80-100 287.8 150 112 38 36 100 98 50.8 9.75 19.1 / 8.2
BT50-FMA50.80-200 337.8 200 162 38 36 100 98 50.8 9.75 19.1 / 9.4

Parameter Explanation

  • L/L1/L2/L3/L4/D/d1/d2 : Overall and mounting dimensions (unit: mm), corresponding to the engineering drawings
  • K1/K2 : Keyway dimensions for inch-standard cutter alignment
  • FIG : Structural type identifier (1=standard type, 2=reinforced type for larger diameters)
  • Weight : Net weight per unit (unit: KG)
  • Model Naming :
    • BTXX: 7/24 taper spindle interface standard (BT30/BT40/BT50)
    • FMAYY.Y: Inch-series face mill arbor type, YY.Y indicates the cutter mounting diameter in millimeters (equivalent to 1", 1-1/4", 1-1/2", 2" inch standards)
    • ZZ: Total length of the tool holder (e.g., 100 = 100mm 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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