Airtac BSED Clamping Double Acting Cylinder BSED125X400S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X400S 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, 400mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke400 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X400S
The AirTAC BSED125X400S 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 drive force of 5734 N each way at 0.5 MPa and 8028 N at 0.7 MPa. The lock delivers a static holding force of 8600 N, clamping the rod securely with no live air.
This 125mm bore unit includes a magnet for CMSE or DMSE sensors. The lock uses a bidirectional collet mechanism engaged only after the rod stops, released via a separate G1/8 port when piston sides are balanced. It features a 32mm rod, M27x2 thread, 40mm cushion length, and a speed range of 30-500 mm/s.
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 BSED125X400S 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 BSED125X400S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X400S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 BSED125X400S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×400 | 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 BSED125X400S Is Used
Heavy Vertical Lifts
Provides 8600 N fail-safe holding for heavy vertical platens if air drops, while the 8028 N both-way force drives the load up and down.
Servo-Driven Machining
Rear rod carries a flag or cam for symmetrical tooling, while the collet locks the 32mm rod during heavy machining to resist bidirectional cutting forces.
High-Mass Pallet Stops
Halts heavy conveyor pallets with equal push/pull force, engaging the spring-applied lock to hold the 819 kgf max drive load securely during transfers.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X400S the Right Cylinder?
Select this 125mm bore model when an application requires both-way symmetric force and fail-safe holding up to 8600 N. If stepping down, the 100mm bore offers 3681 N drive force at 0.5 MPa and 5500 N holding force. As the largest standard bore, stepping up requires a custom solution. Ensure the load is <=8600 N, engage the lock only when stopped, and allow >=0.5 s for release.
For this 400mm stroke, add external guide rails to manage side loads and prevent rod binding. Replacement matches require 125mm bore, 400mm stroke, PT1/2 ports, Basic/LB/FA/TC mounting, and the -S magnet option.
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 BSED125X400S FAQ
If air is lost, the 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 hold, not a dynamic brake, so it must only engage after the rod stops.
The equal both-way drive force is 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, with a max drive of 819 kgf. The static fail-safe holding force of the lock is 8600 N. Release the lock via the G1/8 port only when both piston sides are pressure-balanced.
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