Both BBT and HSK have double-sided grips, but which one is better?

Release date:

2025-12-11

There is no absolute "superiority" or "inferiority" between BBT and HSK as double-sided toolholders; the key is to match the machining requirements—choose HSK for high speed and high precision, and BBT for heavy-duty and stable cutting.

Dimension	BBT Tool Holder	HSK Tool Holder
Taper/Structure	7:24 solid taper (BIG-modified BT), large taper contact area	1:10 hollow short taper (German standard), hollow thin-walled, compact design
Precision/Runout	Radial runout ≤0.005mm, high repeat positioning accuracy	Radial runout ≤0.002mm, stable precision at high speeds
Speed Range	≤20,000rpm (medium-high speed, heavy-duty)	40,000–60,000rpm (ultra-high speed)
Rigidity/Vibration	Solid structure, high bending rigidity & vibration resistance	Centrifugal force self-compensation, good dynamic balance (high-speed light-load)
Applications	Large molds, casings, difficult materials (compatible with partial BT spindles)	Aerospace parts, mirror molds, 5-axis machines, automated lines
Cost/Compatibility	Cost-effective, low retrofitting cost	Higher price, dedicated HSK spindles required (large initial investment)

Selection Recommendations:

If ultra-high speed (≥30000rpm) and μm-level precision are the core requirements, such as precision mold making and aerospace thin-walled component machining, HSK is more suitable.

If medium-to-high speed, heavy-duty operation, high rigidity, and vibration resistance are the focus, such as large-scale machining and BT spindle retrofitting, BBT is more advantageous.

It's gone.

Backhand tool holder: Anti-interference in deep hole machining

BLOGS

Both BBT and HSK have double-sided grips, but which one is better?

Backhand tool holder: Anti-interference in deep hole machining

The pullback toolholder solves the problems of loosening and precision issues in traditional toolholders with its mechanical anti-loosening structure and ultra-precision manufacturing, making it particularly suitable for deep cavity machining and high-speed precision milling.