Airtac BSED Clamping Double Acting Cylinder BSED125X450S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X450S 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, 450mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke450 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X450S
The AirTAC BSED125X450S is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. A Ø32 mm rod exits both ends, delivering equal force in both directions—about 5734 N each way at 0.5 MPa. The fail-safe collet mechanism provides an 8600 N static holding force without requiring live air.
Because the rear rod extends out the back, it can carry a flag or cam for external tracking while resisting rotational torque. The lock engages bidirectionally via a dedicated G1/8 release port, operating at 0.15-0.7 MPa. This 125 mm bore unit includes a -S magnet for CMSE or DMSE sensors and utilizes adjustable air cushions at both ends to absorb kinetic energy.
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 BSED125X450S 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 BSED125X450S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X450S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 BSED125X450S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×450 | 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 BSED125X450S Is Used
Heavy Vertical Lifts
Holds a massive vertical platen steady at 8600 N during an E-stop, while the 8028 N both-way drive force raises and lowers the mass smoothly.
Multi-Station Machining
Uses the rear exiting rod to mount a cam for tooling confirmation, locking the 819 kgf max drive load rigidly during part machining.
Pallet Indexing Stop
Provides symmetric stopping force in both directions on a heavy-duty conveyor, engaging the fail-safe collet to hold heavy pallets during loading.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X450S the Right Cylinder?
Choose this 450 mm stroke model when a heavy load demands both symmetric thrust and fail-safe positioning. Verify your static load does not exceed the 8600 N holding capacity. If you need less force, the neighboring 100 mm bore provides 3681 N at 0.5 MPa and a 5500 N hold; stepping up is not possible as 125 mm is the largest standard size. For any stroke at or above 300 mm, always use external guide rails to prevent side-load wear on the seals.
Engage the lock only after the rod completely stops, and release it only when piston sides are pressure-balanced, allowing at least 0.5 seconds for the transition. To replace this unit, match the 125 mm bore, 450 mm stroke, PT1/2 cylinder port, and -S magnet option. Mounting options are limited to Basic, LB, FA, and 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 BSED125X450S FAQ
The drive force is equal both ways at 5734 N @0.5 MPa and 8028 N @0.7 MPa (max 819 kgf). The separate static holding force of the spring-applied rod lock is 8600 N, which holds the load securely with no live air.
If air is lost or an E-stop trips, the spring-applied collet instantly clamps the rod, engaging the 8600 N bidirectional hold. It is a static lock, not a dynamic brake, so it must only engage after the rod stops. To release, restore pressure to the G1/8 port and allow at least 0.5 seconds.
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