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BT30/40/50 power milling chuck arbors

Core structural principle

1. Needle locking structure: The nut is equipped with multiple sets of precision needle rollers. When the nut is rotated, the inclined surface of the needle rollers pushes the inner cylinder to shrink evenly, holding the straight handle tool tightly; Locking is effortless, evenly distributed, not easy to slip, and does not damage the tool holder.

2. Thickened thick walled body: The clamping section of the cylinder wall is significantly thickened, with bending and vibration resistance far exceeding that of the ER handle, and the tool does not vibrate during heavy cutting.

3. Split sealing structure: Double dust-proof and waterproof rings, blocking cutting fluid and iron filings from entering the internal needle rollers, extending the service life.

4. Straight tube clamping: Equipped with strong tube clamps (C20/C25/C32/C42) as standard, the clamping range is fixed without the need for multiple layers of spring clamps.

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BT power milling chuck arbors

Model BT40-C-L1	d(mm)	D(mm)	D1
BT40-C16-86	16	50	44.5
BT40-C20-90	20	56
BT40-C20-100	20	56
BT40-C20-135	20	56
BT40-C25-100	25	63
BT40-C25-105	25	63
BT40-C32-100	32	70
BT40-C32-105	32	70
BT40-C32-135	32	70
BT40-C42-115	42	90

Q1: What are the core strengths?
A:

Extremely strong clamping force: 2-3 times that of ordinary ER tool holders, no dropping or slipping during high feed, deep cutting, and large margin roughing.
High rigidity and seismic resistance: Thick wall + large area fitting, minimal rough machining vibration, lower tool wear, better surface quality.
Stable accuracy: Standard radial runout ≤ 0.005mm, dynamic balance up to G2.5 (available at 30000rpm high speed).
Heavy duty durability: Made of 20CrMnTi material, quenched to 58-60HRC, low-temperature stress relief treatment, no deformation after long-term use.
Compatible with automatic tool changing: Standard BT taper handle, compatible with all BT30/40/50 vertical machining center ATC tool libraries.

Q2: What machining scenarios is it suitable for?
A:

Large surplus roughing, side milling, and deep groove milling of mold steel, stainless steel, and forgings
Heavy duty cutting with large-diameter straight end mills, corn milling cutters, and extended coarse milling cutters
High feed rate and high torque cutting, conditions where tool slippage and vibration are concerns
Heavy duty BT50 gantry machine tool for high-strength milling

Q3: What are the precautions for use?
A:

Before clamping, clean the inner hole of the tool holder, the collet, and the tool shank to ensure no iron filings or oil stains;
The collet must match the nominal diameter of the cutting tool; do not clamp too large or too small;
Use the matching special wrench for locking; do not exceed the torque;
Regularly inspect the needle rollers and collets for cracking and wear during long-term heavy cutting;
For high-speed precision machining, dynamic balancing G2.5 is recommended.

Q4: What is the MOQ?
A: MOQ 5.

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