KORRETTO · CLAMPING HEAD SYSTEMS
Through-Hole Segmented Mandrel System
The Through-Hole Segmented Mandrel System holds a workpiece from its bore using a matched SB1 segmented clamping bushing. This internal clamping mandrel provides access to the outside diameter for turning, grinding and finishing.
How It Works
The pull-back mechanism expands the segmented bushing against the workpiece bore. The front draw connection covers the bushing end face, helping shield the rubber connection from chips. Check the mounting dimensions and usable clamping length against the actual workpiece.
Selection should confirm the bore diameter, bore tolerance, expansion range, support length, workpiece material, actuation method, draw force, clamping force, maximum speed and machine or fixture layout.
Key Features
Internal bore clamping
For open-through bores and accessible outside machining surfaces.
SB1 segmented bushing
The replaceable bushing supplies the steel gripping contact.
Pull-back mechanism
Match the draw connection and stroke to the machine.
Dimensioned interface
Compare D, L, O, h, M and M1 with the technical drawing.
Typical Applications
- Through-hole bore workpieces
- Bore-located sleeves and rings
- Parts requiring outside-diameter machining
- Precision turning, grinding and finishing
- Internal expansion clamping fixtures
- Workpieces requiring repeat bore location
Technical Data: Through-Hole Segmented Mandrel System
Use the drawing and parameter tables to check chuck structure, expansion range, stroke, draw force, radial clamping force, recommended workpiece tolerance, maximum clamping diameter and maximum speed.
| Model | D (mm) | L (mm) | O (mm) | h (mm) | Expansion Range d (mm) | M |
|---|---|---|---|---|---|---|
| KB100 | 139 | 100 | 19 | 7.5 | 20–28 | M44×1.5 |
| KB110 | 139 | 110 | 25 | 11 | 26–38 | M44×1.5 |
| KB120 | 139 | 130 | 35 | 10 | 36–54 | M44×1.5 |
| KB130 | 139 | 140 | 49 | 11 | 50–80 | M44×1.5 |
| KB140 | 139 | 155 | 68 | 16 | 69–100 / 101–120 | M44×1.5 |
| KB150 | 230 | 195 | 97 | 16 | 100–130 | M44×1.5 |
| KB160 | 230 | 220 | 125 | 25 | 130–160 | M44×1.5 |
| KB170 | 230 | 245 | 156 | 29.5 | 160–200 | M44×1.5 |
| Model | M1 | Collet Used | Type | Stroke (mm) | Max. CL (mm) | Recommended Workpiece Tolerance (mm) |
|---|---|---|---|---|---|---|
| KB100 | M30×1.5 | SB100 | Pull-back | 1.5+2 | 22 | ±0.25 |
| KB110 | M30×1.5 | SB110 | Pull-back | 1.5+2 | 26 | ±0.25 |
| KB120 | M30×1.5 | SB120 | Pull-back | 1.5+2 | 43 | ±0.25 |
| KB130 | M30×1.5 | SB130 | Pull-back | 2+2.5 | 49 | ±0.35 |
| KB140 | M30×1.5 | SB140 | Pull-back | 2.5+3 | 59 | ±0.4 |
| KB150 | M30×1.5 | SB150 | Pull-back | 3+3 | 86 | ±0.5 |
| KB160 | M30×1.5 | SB160 | Pull-back | 3+3 | 96 | ±0.5 |
| KB170 | M30×1.5 | SB170 | Pull-back | 3+3 | 94 | ±0.5 |
Download the product datasheet (PDF)
KB140 uses SB140 bushings in two size groups: 69–100 mm and 101–120 mm. The 101–120 mm bushing is limited to 4200 rpm; the complete setup must also remain within the mandrel and machine limits.
What to Provide Before Quotation
- Mandrel and SB1 bushing codes
- Bore diameter, tolerance and support length
- Machine interface, working speed and cutting conditions
Related Clamping Head Systems
FAQ
What is the Through-Hole Segmented Mandrel System used for?
The Through-Hole Segmented Mandrel System holds a workpiece from its bore using a matched SB1 segmented clamping bushing. This internal clamping mandrel provides access to the outside diameter for turning, grinding and finishing.
Is this the same as the through-hole expanding collet body?
No. The KB mandrel is the complete internal clamping assembly; the SB1 bushing is its replaceable gripping element.
Is this an outside-clamping clamping head chuck?
No. This mandrel expands inside the bore. An external clamping-head chuck closes around the workpiece outside diameter.
When should I choose this chuck?
Choose it when the workpiece has an open bore, the outside surface must remain accessible and internal expansion clamping is required.
What should be checked before selection?
Check bore diameter, bore tolerance, support length, expansion range, actuation method, draw force, clamping force and maximum speed.
Does the rubber directly contact the bore wall?
No. The hardened steel segments of the matched bushing contact the bore. Vulcanized rubber connects the segments and enables expansion and release.
Can it be used for rough machining or higher-cycle production?
It can be used when the wall thickness, support length, expansion range, machine rigidity and cutting load are suitable. Final confirmation should be based on the workpiece drawing and trial clamping.
What information is needed?
Provide the workpiece drawing, bore size, bore tolerance, material, machining process, required support length, machine layout and accuracy requirement.