Airtac BSED Clamping Double Acting Cylinder BSED40X125
The AirTAC BSED Clamping Double Acting Cylinder BSED40X125 combines a double-rod ISO 15552 cylinder — a Ø16mm rod out BOTH ends for equal force both directions — with an integrated spring-applied, air-released ROD LOCK that holds up to 900 N in either direction if air is lost. Ø40mm bore, 125mm stroke, PT1/4 ports, G1/8 lock-release.
- BoreØ40 mm
- Stroke125 mm
- Static holding force900 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/4
- Lock-release portG1/8
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BSED Clamping Double Acting Cylinder BSED40X125
The AirTAC BSED40X125 is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. Because the annulus areas match, drive force is equal both ways, providing 528 N at 0.5 MPa and 739 N at 0.7 MPa. A rod exits both ends, allowing rear-side tooling or a flag while resisting rotation.
The collet lock delivers a 900 N static holding force with zero live air required. Engage the lock only after the rod stops, and release it only when piston sides are pressure-balanced, allowing at least 0.5 s. This SKU has no magnet, so it does not support CMSE or DMSE position sensors.
Double Rod + 900 N Rod Lock (Ø40mm)
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 BSED40X125 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 BSED40X125 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED40X125 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Static holding force | 900 N |
| Cylinder port | PT1/4 |
| 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 – 800 mm/s |
| Max stroke | Up to 800 mm |
Specifications follow the official AirTAC BSED datasheet. Rod thread M12×1.25 both ends. Mounting (BSED): Basic, LB, FA, TC. Port options: PT (standard) / G (BSPP); lock-release port is G1/8.
Theoretical Output Force (Ø40mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa (max) | 739 N |
| Max drive (@0.7 MPa) | 75 kgf |
A rod exits both ends, so force is equal on extend and retract. Drive force is separate from the 900 N static lock holding force. Size with a safety margin.
Model Code: Airtac BSED Clamping Double Acting Cylinder BSED40X125
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 40 | Bore size in mm. |
| ×125 | 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 BSED40X125 Is Used
Pneumatic Lift Station
Holds a 900 N vertical workpiece securely in place during an E-stop or air loss, while the 739 N both-way drive raises and lowers the platform.
Pallet Stopper Arm
Uses the double-rod configuration to mount a stop flag on the rear rod, providing 528 N of equal push-pull force to halt 40 mm conveyors.
Component Transfer Gate
Transfers parts with 739 N of symmetric force, engaging the 900 N collet lock to freeze the 125 mm stroke mid-cycle for robotic pickup.
Is the Airtac BSED Clamping Double Acting Cylinder BSED40X125 the Right Cylinder?
Select this 40 mm bore when an application needs symmetric both-way force and a fail-safe hold up to 900 N. If your load requires less holding or drive force, step down to the 32 mm bore (345 N at 0.5 MPa, 600 N hold). If you need more, step up to the 50 mm bore (825 N at 0.5 MPa, 1400 N hold). Always verify the load is under 900 N before relying on the lock.
This cylinder uses a PT1/4 port, a 16 mm rod, and a 30 mm cushion. Mounting options are Basic, LB, FA, and TC. For replacement parts, match the 40 mm bore, 125 mm stroke, PT thread, and no-magnet configuration.
Quick checklist
- ✓ Need both symmetric force AND fail-safe hold?
- ✓ Load to hold ≤ 900 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 BSED40X125 FAQ
If air is lost, the spring-applied collet clamps the rod, providing a 900 N static holding force. The drive force is equal both ways at 528 N (0.5 MPa) and 739 N (0.7 MPa), with a max drive of 75 kgf.
The lock is not a dynamic brake. Engage it only after the rod stops. To release, apply air to the G1/8 release port only after both piston sides are pressure-balanced, allowing at least 0.5 seconds for the collet to disengage.
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Standard models are processed and dispatched in 3-5 business days.
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