BT Series LBK Boring Bar Tool Holder - BT30/BT40/BT50

BT Series LBK Boring Bar Tool Holder - BT30/BT40/BT50

High-precision BT taper LBK boring bar holders with superior rigidity, available in LBK1-LBK6 interfaces and multiple lengths, designed for precision boring, reaming and counterboring operations on BT spindle CNC machining centers.
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Description

BT series LBK boring bar holders are manufactured from high-strength alloy steel with overall vacuum quenching and precision grinding, the essential tool holders for precision boring applications on BT spindle CNC machining centers.
  1. Ultra-high precision machining ensures ≤0.003mm concentricity accuracy, delivering exceptional boring precision and surface finish.
  2. High-rigidity one-piece construction minimizes vibration during machining, extending tool life and improving machining efficiency.
  3. Comprehensive size range supports LBK1, LBK2, LBK3, LBK4, LBK5 and LBK6 standard boring head interfaces, with multiple length options to accommodate various machining depths.
  4. Standard 7/24 taper design is 100% compatible with all mainstream BT30, BT40 and BT50 spindle CNC machine tools.
  5. Black oxide surface treatment provides excellent corrosion resistance and long-term durability in industrial environments.
  6. Widely used in precision boring, reaming, counterboring and spot-facing operations across mold making, automotive, aerospace and general machinery industries.

Complete Specification Table (Unit: mm)

BT30 Series LBK Boring Bar Holders

Model L L1 L2 L3 L4 L5 D d2 d1 Screw T Weight Price
BT30-LBK1-55 103.4 55 33 22 30 5.05 46 19 11 M4×0.5P 0.7KG
BT30-LBK1-70 118.4 70 48 22 30 5.05 46 19 11 M4×0.5P 0.7KG
BT30-LBK2-80 128.4 80 58 22 31 6.62 46 24 14 M5×0.5P 0.8KG
BT30-LBK3-80 128.4 80 58 22 35 8 46 31 18 M6×0.75P 0.9KG
BT30-LBK4-70 118.4 70 48 22 39 10 46 39 22 M8×0.75P 1.0KG
BT30-LBK5-60 108.4 60 38 22 45 13 46 50 28 M10×1.0P 1.1KG
BT30-LBK6-60 108.4 60 38 22 55 16 46 63 36 M12×1.0P 1.2KG

BT40 Series LBK Boring Bar Holders

Model L L1 L2 L3 L4 L5 D d2 d1 Screw T Weight Price
BT40-LBK1-75 140.4 75 48 27 30 5.05 63 19 11 M4×0.5P 1.0KG
BT40-LBK1-105 170.4 105 78 27 30 5.05 63 19 11 M4×0.5P 1.2KG
BT40-LBK2-85 150.4 85 58 27 31 6.62 63 24 14 M5×0.5P 1.2KG
BT40-LBK2-115 180.4 115 88 27 31 6.62 63 24 14 M5×0.5P 1.3KG
BT40-LBK2-165 230.4 165 138 27 31 6.62 63 24 14 M5×0.5P 1.4KG
BT40-LBK2-200 265.4 200 173 27 31 6.62 63 24 14 M5×0.5P 1.55KG
BT40-LBK3-95 160.4 95 68 27 35 8 63 31 18 M6×0.75P 1.3KG
BT40-LBK3-125 190.4 125 98 27 35 8 63 31 18 M6×0.75P 1.2KG
BT40-LBK3-155 220.4 155 128 27 35 8 63 31 18 M6×0.75P 1.6KG
BT40-LBK3-185 250.4 185 158 27 35 8 63 31 18 M6×0.75P 1.7KG
BT40-LBK3-205 270.4 205 178 27 35 8 63 31 18 M6×0.75P 1.8KG
BT40-LBK4-85 150.4 85 58 27 39 10 63 39 22 M8×0.75P 1.45KG
BT40-LBK4-130 195.4 130 103 27 39 10 63 39 22 M8×0.75P 1.5KG
BT40-LBK4-175 240.4 175 148 27 39 10 63 39 22 M8×0.75P 2.1KG
BT40-LBK4-205 270.4 205 178 27 39 10 63 39 22 M8×0.75P 2.2KG
BT40-LBK4-250 315.4 250 223 27 39 10 63 39 22 M8×0.75P 2.3KG
BT40-LBK4-300 365.4 300 273 27 39 10 63 39 22 M8×0.75P 2.4KG
BT40-LBK5-75 140.4 75 48 27 45 13 63 50 28 M10×1.0P 1.7KG
BT40-LBK5-125 190.4 125 98 27 45 13 63 50 28 M10×1.0P 1.95KG
BT40-LBK5-175 240.4 175 148 27 45 13 63 50 28 M10×1.0P 3.0KG
BT40-LBK5-205 270.4 205 178 27 45 13 63 50 28 M10×1.0P 3.2KG
BT40-LBK5-250 315.4 250 223 27 45 13 63 50 28 M10×1.0P 3.5KG
BT40-LBK6-65 130.4 65 38 27 55 16 63 63 36 M12×1.0P 2.15KG
BT40-LBK6-115 180.4 115 88 27 55 16 63 63 36 M12×1.0P 3.5KG
BT40-LBK6-165 230.4 165 138 27 55 16 63 63 36 M12×1.0P 3.85KG
BT40-LBK6-205 270.4 205 178 27 55 16 63 63 36 M12×1.0P 4.1KG
BT40-LBK6-250 315.4 250 223 27 55 16 63 63 36 M12×1.0P 4.4KG
BT40-LBK6-300 365.4 300 273 27 55 16 63 63 36 M12×1.0P 4.7KG

BT50 Series LBK Boring Bar Holders

Model L L1 L2 L3 L4 L5 D d2 d1 Screw T Weight Price
BT50-LBK1-90 191.8 90 52 38 30 5.05 100 19 11 M4×0.5P 3.7KG
BT50-LBK1-115 216.8 115 77 38 30 5.05 100 19 11 M4×0.5P 3.9KG
BT50-LBK1-145 246.8 145 107 38 30 5.05 100 19 11 M4×0.5P 4.4KG
BT50-LBK1-175 276.8 175 137 38 30 5.05 100 19 11 M4×0.5P 4.5KG
BT50-LBK1-205 306.8 205 167 38 30 5.05 100 19 11 M4×0.5P 5.0KG
BT50-LBK2-90 191.8 90 52 38 31 6.62 100 24 14 M5×0.5P 3.8KG
BT50-LBK2-110 211.8 110 72 38 31 6.62 100 24 14 M5×0.5P 4.0KG
BT50-LBK2-140 241.8 140 102 38 31 6.62 100 24 14 M5×0.5P 4.3KG
BT50-LBK2-175 276.8 175 137 38 31 6.62 100 24 14 M5×0.5P 4.6KG
BT50-LBK2-205 306.8 205 167 38 31 6.62 100 24 14 M5×0.5P 4.9KG
BT50-LBK3-90 191.8 90 52 38 35 8 100 31 18 M6×0.75P 4.4KG
BT50-LBK3-125 226.8 125 87 38 35 8 100 31 18 M6×0.75P 4.4KG
BT50-LBK3-155 256.8 155 117 38 35 8 100 31 18 M6×0.75P 4.6KG
BT50-LBK3-185 286.8 185 147 38 35 8 100 31 18 M6×0.75P 4.4KG
BT50-LBK3-215 316.8 215 177 38 35 8 100 31 18 M6×0.75P 4.65KG
BT50-LBK4-90 191.8 90 52 38 39 10 100 39 22 M6×0.75P 4.6KG
BT50-LBK4-115 216.8 115 77 38 39 10 100 39 22 M8×0.75P 4.8KG
BT50-LBK4-145 246.8 145 107 38 39 10 100 39 22 M8×0.75P 5.2KG
BT50-LBK4-175 276.8 175 137 38 39 10 100 39 22 M8×0.75P 4.6KG
BT50-LBK4-205 306.8 205 167 38 39 10 100 39 22 M8×0.75P 4.85KG
BT50-LBK4-250 351.8 250 212 38 39 10 100 39 22 M8×0.75P 5.2KG
BT50-LBK4-300 401.8 300 262 38 39 10 100 39 22 M8×0.75P 5.2KG
BT50-LBK4-350 451.8 350 312 38 39 10 100 39 22 M8×0.75P 5.8KG
BT50-LBK5-95 196.8 95 57 38 45 13 100 50 28 M10×1.0P 5.4KG
BT50-LBK5-105 206.8 105 67 38 45 13 100 50 28 M10×1.0P 5.5KG
BT50-LBK5-150 251.8 150 112 38 45 13 100 50 28 M10×1.0P 6.0KG
BT50-LBK5-180 281.8 180 142 38 45 13 100 50 28 M10×1.0P 6.2KG
BT50-LBK5-240 341.8 240 202 38 45 13 100 50 28 M10×1.0P 6.4KG
BT50-LBK5-270 371.8 270 232 38 45 13 100 50 28 M10×1.0P 6.7KG
BT50-LBK5-300 401.8 300 262 38 45 13 100 50 28 M10×1.0P 7.0KG
BT50-LBK5-350 451.8 350 312 38 45 13 100 50 28 M10×1.0P 7.3KG
BT50-LBK6-90 191.8 90 52 38 55 16 100 63 36 M12×1.0P 5.9KG
BT50-LBK6-105 206.8 105 67 38 55 16 100 63 36 M12×1.0P 6.1KG
BT50-LBK6-150 251.8 150 112 38 55 16 100 63 36 M12×1.0P 6.3KG
BT50-LBK6-170 271.8 170 132 38 55 16 100 63 36 M12×1.0P 6.5KG
BT50-LBK6-180 281.8 180 142 38 55 16 100 63 36 M12×1.0P 6.7KG
BT50-LBK6-230 331.8 230 192 38 55 16 100 63 36 M12×1.0P 7.45KG
BT50-LBK6-270 371.8 270 232 38 55 16 100 63 36 M12×1.0P 8.2KG
BT50-LBK6-300 401.8 300 262 38 55 16 100 63 36 M12×1.0P 9.5KG
BT50-LBK6-350 451.8 350 312 38 55 16 100 63 36 M12×1.0P 10.8KG
BT50-LBK6-400 501.8 400 362 38 55 16 100 63 36 M12×1.0P 11.8KG
BT50-LBK6-450 551.8 450 412 38 55 16 100 63 36 M12×1.0P 12.8KG
BT50-LBK6-500 601.8 500 462 38 55 16 100 63 36 M12×1.0P 13.8KG

Parameter Explanation

  • L/L1/L2/L3/L4/L5/D/d1/d2 : Overall and mounting dimensions (unit: mm), corresponding to the engineering drawing
  • Screw T : Thread specification of the boring head locking screw
  • Weight : Net weight per unit (unit: KG)
  • Model Naming :
    • BTXX: 7/24 taper spindle interface standard (BT30/BT40/BT50)
    • LBKYY: LBK boring head interface number (LBK1-LBK6), matching standard modular boring heads
    • 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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