Airtac BSED Clamping Double Acting Cylinder BSED125X800
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X800 combines a double-rod ISO 15552 cylinder — a Ø32mm rod out BOTH ends for equal force both directions — with an integrated spring-applied, air-released ROD LOCK that holds up to 8600 N in either direction if air is lost. Ø125mm bore, 800mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke800 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X800
The AirTAC BSED125X800 is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. A rod exits both ends, yielding equal push and pull forces of 5734 N each way at 0.5 MPa. The rear rod is ideal for mounting tooling or flags and naturally resists rotation.
This 125 mm bore unit delivers a robust 8600 N bidirectional static holding force with no live air required. The lock uses a collet mechanism engaged via a separate G1/8 release port; it is a static holding device, not a dynamic brake, and must only engage after the rod stops. This SKU ships without a magnet, so it does not support position sensing.
Double Rod + 8600 N Rod Lock (Ø125mm)
A rod exits both ends for symmetric force and back-rod tooling, and a spring clamps the collet so the Airtac BSED Clamping Double Acting Cylinder BSED125X800 holds its position in both directions on air loss or E-stop. Apply 0.15–0.7 MPa to the G1/8 release port to unlock. Engage only after the rod has stopped (not a dynamic brake), and release only when both piston sides are pressure-balanced; allow ≥0.5 s for full release.
Airtac BSED Clamping Double Acting Cylinder BSED125X800 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X800 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 mm |
| Static holding force | 8600 N |
| Cylinder port | PT1/2 |
| Lock-release port | G1/8 |
| Configuration | Double rod, double acting |
|---|---|
| Operating pressure | 0.15 – 0.7 MPa |
| Unlocking pressure | 0.15 – 0.7 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Max stroke | Up to 1000 mm |
Specifications follow the official AirTAC BSED datasheet. Rod thread M27×2 both ends. Mounting (BSED): Basic, LB, FA, TC. Port options: PT (standard) / G (BSPP); lock-release port is G1/8.
Theoretical Output Force (Ø125mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 5734 N |
| 0.7 MPa (max) | 8027 N |
| Max drive (@0.7 MPa) | 819 kgf |
A rod exits both ends, so force is equal on extend and retract. Drive force is separate from the 8600 N static lock holding force. Size with a safety margin.
Model Code: Airtac BSED Clamping Double Acting Cylinder BSED125X800
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×800 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensor sensing. |
Thread: PT (blank) / G. Mounting (BSED): Basic, LB, FA, TC. Related: SED (double rod, no lock), BSE (single-rod rod lock). Sensors CMSE/DMSE fit magnetic BSED.
Where the Airtac BSED Clamping Double Acting Cylinder BSED125X800 Is Used
Heavy Machining Fixtures
Clamps heavy cast iron blocks during CNC milling. The 8600 N lock holds the 800 mm stroke firmly against vibration when air is removed, while the 8028 N both-way drive manages heavy traverse.
Overhead Hoist Interlocks
Raises and lowers heavy tooling racks. The double-rod design resists rotation on the long 800 mm stroke, and the collet lock provides a static hold during maintenance, though safety-rated controls are required for man-rated loads.
Large Assembly Presses
Applies equal 5734 N clamping force in both directions to seat large components. The fail-safe collet mechanism prevents the 125 mm bore rod from drifting if the 0.7 MPa air supply drops suddenly.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X800 the Right Cylinder?
Select this 800 mm stroke model when an application demands symmetric both-way force and fail-safe mid-stroke positioning. Verify your load does not exceed the 8600 N holding capacity. If you need less force, the adjacent 100 mm bore provides 3681 N at 0.5 MPa and 5500 N holding force; if you need more, note that 125 mm is the largest standard BSED bore. Because the 800 mm stroke is long, always use external guide rails to prevent side-load damage to the extruded aluminum barrel.
To safely release the lock, pressure-balance both piston sides first, apply air to the G1/8 release port, and wait at least 0.5 seconds before moving. When replacing, match the 125 mm bore, 800 mm stroke, PT1/2 cylinder port, and your specific mounting choice (Basic, LB, FA, or TC).
Quick checklist
- ✓ Need both symmetric force AND fail-safe hold?
- ✓ Load to hold ≤ 8600 N?
- ✓ Back-rod space for tooling/flag
- ✓ Lock engaged only when stopped
- ✓ G1/8 release-air line available
Installation & Safety Notes
- check Engage the lock only after the rod has stopped — not a dynamic brake.
- check Release only when both piston sides are pressure-balanced.
- check Allow ≥0.5 s for full release before commanding motion.
- check Feed the G1/8 release port with 0.15–0.7 MPa clean air.
- check Support both rod ends; avoid side load.
- check Use BSED mounting (Basic/LB/FA/TC).
Airtac BSED Clamping Double Acting Cylinder BSED125X800 FAQ
The integrated spring-applied collet immediately clamps the rod, providing a bidirectional static holding force of 8600 N with no live air. It is a fail-safe lock, not a dynamic brake, so it only engages after the rod stops. For overhead or man-rated loads, use separate safety-rated controls.
The double-rod design provides equal drive force both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, with a maximum drive force of 819 kgf at 0.7 MPa. This drive force is separate from the 8600 N static holding force of the lock.
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