Four-jaw solid pneumatic chuck for square parts and four-point clamping.
BK-SQ 4-Jaw Solid Pneumatic Chuck
KORRETTO BK-SQ 4-jaw solid pneumatic chuck is used for square parts, four-sided workpieces and applications where four-point pneumatic clamping is preferred. The solid structure is suitable for short workpieces and individual blanks that do not require through-spindle passage. Selection should confirm part shape, jaw contact, chuck size, mounting dimensions, air pressure, clamping force and maximum speed.
Product Overview
The BK-SQ 4-jaw solid pneumatic chuck is selected when four-point contact is more suitable than two-jaw or three-jaw clamping. It can be used for square or four-sided workpieces and other parts requiring balanced support from four directions.
This page only covers the BK-SQ 4-jaw solid pneumatic chuck. It does not include 2-jaw, 3-jaw, vertical, semi-through-hole or front-mounted pneumatic chuck structures.
Key Features
| Feature | Description |
|---|---|
| 4-jaw pneumatic clamping | Provides four-point contact for square or four-sided workpieces. |
| Solid chuck structure | Used when through-spindle material passage is not required. |
| Air-actuated operation | Supports pneumatic clamping and release. |
| Suitable for short blanks | Designed for individual parts loaded from the front. |
| Workpiece-specific jaw setup | Jaw contact should be confirmed according to the part shape and cutting load. |
Typical Applications
- Square parts
- Four-sided workpieces
- Short blanks
- CNC lathe pneumatic clamping
- Workpieces requiring four-point support
Technical Data and Dimensions
Use the drawing and parameter tables to check chuck size, installation dimensions, jaw stroke, air pressure, clamping force, maximum speed, weight and compatible machine conditions.
| Model | D | D1 | D2 | D3 | H | H1 | h | Gmax K | p | Z × d | Power Wedge Serration | Matching Jaw Model |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BK110SQ-4 | 115 | 72 | 102 | 22 | 106 | 81 | 3 | 17 | 16 | 3-M8 | 1×53° | BK110Z1 |
| BK130SQ-4 | 135 | 95 | 108 | 25 | 123 | 92 | 4.5 | 15.5 | 18 | 3-M8 | 1×53° | BK130Z1 |
| BK160SQ-4 | 172 | 130 | 142 | 25 | 129 | 93 | 4.5 | 17.5 | 20 | 3-M8 | 1×53° | BK160Z1 |
| BK200SQ-4 | 210 | 165 | 180 | 32 | 133 | 97 | 5 | 17 | 25 | 3-M10 | 1×53° | BK200Z1 |
| BK250SQ-4 | 250 | 206 | 226 | 40 | 145 | 99 | 5 | 17 | 30 | 3-M12 | 1×53° | BK250Z1 |
| BK320SQ-4 | 325 | 270 | 290 | 50 | 177 | 116 | 5 | 29 | 32 | 6-M12 | 1.5×60° | BK320Z2-60 |
| BK400SQ-4 | 400 | 340 | 368 | 60 | 212 | 141 | 6 | 33 | 40 | 6-M16 | 1.5×60° | — |
| BK500SQ-4 | 500 | 440 | 465 | 70 | 256 | 183 | 6 | 34 | 60 | 6-M16 | 3×60° | — |
| Model | Jaw Stroke t (Diameter, mm) | Max. Clamping Force (kN) | Max. Expanding Force (kN) | Allowable Pressure (MPa) | Max. Speed (r/min) | Clamping Range (mm) | Expanding Range (mm) | Net Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| BK110SQ-4 | 3.7 | 14 | 7.4 | 0.4–0.8 | 4800 | 2–115 | 15–120 | 6 |
| BK130SQ-4 | 3.2 | 21.2 | 11.5 | 0.4–0.8 | 4800 | 2–130 | 20–140 | 9 |
| BK160SQ-4 | 3.7 | 36.5 | 19.3 | 0.4–0.8 | 4200 | 2–170 | 20–180 | 14 |
| BK200SQ-4 | 4.2 | 53.8 | 30.7 | 0.4–0.8 | 5000 | 5–210 | 20–240 | 22.6 |
| BK250SQ-4 | 4.8 | 73.2 | 46.9 | 0.4–0.8 | 2800 | 10–260 | 30–280 | 33.4 |
| BK320SQ-4 | 8.5 | 116.6 | 78.3 | 0.4–0.8 | 2300 | 10–350 | 40–360 | 73 |
| BK400SQ-4 | 11.5 | 158.2 | 102.9 | 0.4–0.8 | 1000 | 15–420 | 50–430 | 128 |
| BK500SQ-4 | 20 | 203.9 | 138.6 | 0.4–0.8 | 1000 | 20–520 | 50–530 | 200 |
Related Pneumatic Chuck Pages
FAQ
What is the BK-SQ 4-jaw solid pneumatic chuck used for?
It is used for square, four-sided, rectangular or special workpieces that benefit from four-point pneumatic clamping.
How is it different from a hydraulic chuck?
A pneumatic chuck uses compressed air for clamping and release, while a hydraulic chuck uses hydraulic pressure. Final selection depends on the required clamping force, workpiece shape and production cycle.
What workpieces are suitable for a 4-jaw solid pneumatic chuck?
It is commonly selected for square parts, four-sided profiles, cast blanks needing four-point support and workpieces that require more balanced contact than a standard 3-jaw chuck.
When should I choose a 4-jaw pneumatic chuck instead of a 3-jaw pneumatic chuck?
Choose it when the part shape or clamping requirement needs four-point support, especially for square or non-round workpieces.
What air pressure should be confirmed?
Check the available operating air pressure, pressure stability and the clamping force margin needed for the workpiece.
What machine or fixture interface should be checked?
Check the mounting interface, bolt pattern, jaw stroke, installation space and whether a solid non-through-hole structure is required.
What should be checked before installation?
Check jaw interference, clamping stroke, workpiece support points, part positioning and repeatability requirements before installation.
What information is needed for quotation?
Provide the workpiece drawing, clamping surface, material, chuck size, operating air pressure, machine layout and required clamping force.