Boschert
Safety Chucks – VT and Classic C
Boschert safety chucks hold the winding shaft at each end, carry the torque and lock shut while turning. Choose the VT chuck with quick, cheap-to-replace wear parts, or the low-cost Classic C chuck – foot or flange mounted, with or without a shaft end.
- 150 kg – 64 tmax. shaft weight
- 40 – 41,000 Nmmax. torque
- 14 – 230 mmsquare bar
- since 1948Classic C-chuck
How it works
How a Safety Chuck Works
Hold the shaft, drive it, and never let it go.
Square Drive
Each end of the winding shaft has a square journal. It drops into the chuck’s square insert, which carries the drive or brake torque to the shaft.
Locked Shut
A handwheel swings over the journal and locks it in. The chuck can’t open while the shaft turns, so the shaft can’t jump out – then it opens fully so a crane or hoist can lift the shaft straight out.
VT: Replaceable Wear Parts
On VT chucks, the parts that touch the journal are separate VT wear parts. When they wear, you swap them – quickly and cheaply – instead of replacing the chuck, and their hardness can be matched to your shaft journals.
VT or C?
Two Proven Designs
VT: Low Running Cost
Replace only the VT wear parts – quick, cheap, short lead time and low stock cost.
VT: Flexible
Wear part size, shape and hardness to suit your shaft journals.
C: Simple
A low-cost chuck for ordinary use – the industry standard since 1948.
Both
Chromed handwheel, rubber finger guard, foot or flange mounting.
The range
The Safety Chuck Range
VT Safety Chuck
Chuck with exchangeable VT wear parts and a chromed handwheel.
- Foot or flange mounted
- Square and shaft end to suit
C Safety Chuck
The Classic chuck: the swivelling handwheel secures the journal in the square bars.
- Low cost
- Ordinary duty
Flange-Mounted Chuck
Flange version for mounting directly to the machine frame.
- With or without shaft end
Sizes
From the Boschert catalogue overview. C chucks are available in sizes 22-30 to 40-50.
| Model | Max. shaft weight | Max. torque | Square bar |
|---|---|---|---|
| Mini | 150 kg | 40 Nm | 14 – 20 mm |
| 19-25 | 400 kg | 120 Nm | 19 – 25 mm |
| 22-30 | 800 kg | 180 Nm | 22 – 30 mm |
| 30-40 | 1,600 kg | 350 Nm | 30 – 40 mm |
| 40-50 | 2,800 kg | 1,100 Nm | 40 – 50 mm |
| 50-80 | 7,000 kg | 2,350 Nm | 50 – 80 mm |
| 80-120 | 12,000 kg | 10,000 Nm | 80 – 120 mm |
| 120-180 | 22,000 kg | 20,000 Nm | 120 – 180 mm |
| 170-230 | 64,000 kg | 41,000 Nm | 170 – 230 mm |
Options include 90° foot mounting, extended chucks, HRV-S and HRV II handwheel locks, automatic airshaft inflation, hydraulic opening and closing, and open/close monitoring.
How to choose
Choosing a Chuck
Weight
Shaft plus full roll.
Torque
Drive or brake torque at the shaft.
Square
Journal square size – and the shaft end, if needed.
Mounting
Foot or flange; add a brake or clutch if required.
Literature & related
More Information
- Safety chuck overview
Sizes, loads and torque · PDF, 13.7 MB - Options
Locks, monitoring and hydraulics · PDF, 13.7 MB - Boschert product catalogue
Safety, sliding, automatic and pneumatic chucks, brakes, clutches, options (2024) · PDF, 13.7 MB
Not Sure Which One You Need?
Tell us about the job – the machine, the conditions and what it has to do – and we’ll help you choose the right Boschert product.