Airtac BSED Clamping Double Acting Cylinder BSED125X25S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X25S 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, 25mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke25 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X25S
The AirTAC BSED125X25S is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A rod exits both ends, providing equal force and speed in both directions—about 5734 N each way at 0.5 MPa. The rear rod can carry a flag or cam and resists rotation.
The fail-safe collet clamps the rod bidirectionally, delivering a 8600 N static holding force with no live air required. It engages when motion stops and releases via a separate G1/8 port when both piston sides are pressure-balanced. The lock is a static holding device, not a dynamic brake.
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 BSED125X25S 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 BSED125X25S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X25S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 BSED125X25S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×25 | 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 BSED125X25S Is Used
Heavy Press Clamping
Secures large stamping dies in place with 8600 N of fail-safe holding force during air loss, while the 8028 N equal both-way drive precisely advances and retracts the tooling.
Vertical Lift Station
Prevents heavy vertical platens from dropping when system pressure drops, utilizing the bidirectional collet lock and double-rod anti-rotation stability.
Pallet Stopper Arm
Uses the rear rod end to mount a cam for position feedback while the front rod halts massive 819 kgf loads, locking instantly if an emergency stop is triggered.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X25S the Right Cylinder?
Choose this 125 mm bore model when your application requires both symmetric drive force and fail-safe holding up to 8600 N. At 0.5 MPa it delivers 5734 N both ways; at 0.7 MPa it reaches 8028 N (819 kgf). If you need less force, the adjacent 100 mm bore provides 3681 N at 0.5 MPa and a 5500 N hold; as the largest standard bore, there is no larger option. Always verify your load is at or below 8600 N. For safety, allow at least 0.5 s after stopping before releasing the lock. The -S magnet supports CMSE reed and DMSE electronic sensors. To replace, match the 125 mm bore, 25 mm stroke, PT1/2 cylinder port, and 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 BSED125X25S FAQ
The drive force is equal both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The integrated fail-safe rod lock provides a static holding force of 8600 N with no live air.
The lock is spring-applied and air-released via a separate G1/8 port. You must only engage it after the rod stops, and release it only when both piston sides are pressure-balanced, allowing at least 0.5 s for the transition.
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