Airtac BSED Clamping Double Acting Cylinder BSED125X250
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X250 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, 250mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke250 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X250
The AirTAC BSED125X250 is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. A rod exits both ends, delivering equal thrust in both directions—about 5734 N each way at 0.5 MPa (8028 N at 0.7 MPa). The integrated collet lock provides a massive 8600 N static holding force, clamping the Ø32 mm rod securely during air loss or E-stop events.
Unlike single-rod variants, the rear rod here resists rotation and can mount a flag or cam for position verification. Operating pressure is capped at 0.7 MPa, and the lock uses a separate G1/8 release port. This SKU ships without a magnet, meaning no CMSE or DMSE position sensors can be fitted. Engage the lock only after the rod stops, and release it only when both piston sides are pressure-balanced, allowing at least 0.5 seconds.
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 BSED125X250 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 BSED125X250 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X250 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 BSED125X250
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×250 | 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 BSED125X250 Is Used
Heavy Stamp Press Feed
Feeds heavy coil stock symmetrically using the 5734 N both-way force, while the 8600 N lock holds the material precisely in place during the stamping cycle.
Overhead Lift Station
Lifts heavy tooling with equal push and pull force; the spring-applied collet engages instantly to hold the 819 kgf load safely if compressed air drops.
Pallet Divert and Hold
Uses the rear rod to mount a tracking cam while the main rod diverts heavy pallets, locking with 8600 N of force to prevent drift during transfer.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X250 the Right Cylinder?
Select this 125 mm bore model when your application demands symmetric force and fail-safe holding up to 8600 N. If you need less force, step down to the 100 mm bore, which provides 3681 N at 0.5 MPa and a 5500 N holding force. If you need more force, this is the largest standard BSED bore available. Ensure your load does not exceed the 8600 N static holding capacity, and verify your system pressure does not exceed the 0.7 MPa ceiling.
When replacing a unit, match the 250 mm stroke, PT1/2 cylinder port, and your specific mounting choice (Basic, LB, FA, or TC). Because this unit lacks the -S magnet option, you must rely on external mechanical switches for position feedback. For any stroke length over 300 mm, add external guide rails to prevent side-load damage, though this 250 mm stroke is well within standard limits.
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 BSED125X250 FAQ
The integrated spring-applied collet immediately clamps the Ø32 mm rod, providing a bidirectional static holding force of 8600 N without any live air. It is a fail-safe holding lock, not a dynamic brake, so it must only be engaged after the rod has stopped moving.
The drive force is equal both ways due to the double-rod design: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The static fail-safe holding force of the rod lock is 8600 N. Release the lock via the G1/8 port only after balancing pressure on both piston sides.
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