BBT50 High Precision Hydraulic toolholders

Features & Selling Points of BT Hydraulic Tool Holder

1. Ultra-low runout & high clamping precisionHydraulic expansion design provides uniform clamping. Radial runout ≤0.003mm near the clamping end. Great surface finish, ideal for mold and micro-tool precision machining.

2. Excellent vibration dampingHydraulic medium absorbs cutting chatter, reduces tool marks, extends tool service life and improves workpiece surface quality.

3. Fast & easy tool clamping, no collet neededHolds cutting tools by hydraulic pressure. Tighten with dedicated wrench only. No extra collets required, saves setup time.

4. Stable clamping force & good concentricityUniform circumferential force, avoids unbalanced load common with ER collets. Suitable for end mills, reamers and precision drills.

5. Slim body for anti-interferenceCompact thin-wall clamping section, perfect for deep cavity machining, avoids collision with workpiece side walls.

6. High repeat clamping accuracyConsistent positioning after repeated tool changes, stable dimensional consistency for mass production.

7. Fine dynamic balance for high-speed machiningPrecision machined body, suitable for high-speed CNC machining centers for finishing operations.

8. Full BT series: BT30 / BT40 / BT50Compatible with BT spindle. Standard, extended and short types available; coolant-through option optional.

9. Application tipBest for finishing and light/medium cutting. Not recommended for heavy stock removal. Tool shank tolerance h6 is suggested.

FAQ

Q1: What is BBT hydraulic chuck?

A: BBT (Big Plus) hydraulic chuck is a 7:24 taper CNC tool holder with dual-contact positioning (taper + flange face). Internal hydraulic chamber deforms under pressure to clamp cylindrical shank tools uniformly in 360°. Both taper and flange contact spindle simultaneously for higher rigidity. It is widely used for high-speed finishing of molds, auto parts and precision components, compatible with automatic tool change (ATC).

Q2: What is the difference between BBT hydraulic chuck and BT hydraulic chuck?

A: BT chuck: Positioning only by taper surface, flange does not touch spindle face. Prone to micro-deformation and vibration at high speed. BBT chuck: Dual-contact design (taper + flange face contact spindle together), greatly improved rigidity, vibration resistance and stable axial positioning.

Compatibility: BBT chuck can be mounted on ordinary BT spindle, but only taper contact works, the advantage of dual-contact cannot be realized. BBT spindle needs BBT chuck to achieve dual-face contact.

Q3: What is the accuracy of BBT hydraulic chuck?

A: Precision grade radial runout ≤0.003mm at 4×tool diameter (4D). Re-clamping repeatability reaches 0.001~0.0015mm with excellent consistency.

Q4: What causes oil leakage? Can it keep working?

A: Common causes: impact drop, over-torque, continuous high temperature, aging seal ring. Stop using immediately if continuous oil leakage appears. Failed hydraulic chamber leads to unstable clamping force and risk of tool drop. It needs factory repair or replacement.

Q5: Can BBT hydraulic chuck be used for heavy rough milling?

A: Not recommended for heavy roughing. Hydraulic structure is designed for semi-finishing and finishing. Heavy impact cutting may damage hydraulic seal and shorten service life. Use ER or heavy-duty milling holder for rough machining.

Q6: Balance grade and max speed?

A: Standard dynamic balance G2.5, suitable for 25000~30000 rpm high-speed cutting. Secondary balancing is available for higher rotating speed requirement.

Q7: What is the advantage of coolant-through BBT hydraulic chuck?

A: Coolant flows inside the chuck directly to cutting edge, improving cooling and chip removal for deep hole and deep cavity machining. Confirm spindle supports through coolant and inspect O-rings to prevent leakage.