Airtac BSED Clamping Double Acting Cylinder BSED125X350
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X350 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, 350mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke350 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X350
The AirTAC BSED125X350 is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. A rod exits both ends, providing equal drive force of 5734 N each way at 0.5 MPa and 8028 N at 0.7 MPa. The fail-safe collet lock delivers a static holding force of 8600 N with no live air required.
This extruded aluminum barrel unit uses a PT1/2 cylinder port and a separate G1/8 lock-release port. It features a 32 mm rod with an M27x2 thread, 40 mm adjustable air cushions both ends, and operates at 30-500 mm/s. This SKU has no magnet, meaning CMSE or DMSE position sensors cannot be used.
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 BSED125X350 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 BSED125X350 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X350 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 BSED125X350
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×350 | 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 BSED125X350 Is Used
Heavy Machining Lifts
Holds heavy vertical machining fixtures securely with 8600 N of fail-safe clamping force while the dual rods provide 8028 N of equal lifting and lowering force.
Large Press Tooling
Rear rod end carries a cam or flag for mid-stroke positioning while the front rod drives the press tooling at equal speeds in both directions.
Automated Pallet Stops
Locks a 125 mm bore actuator in place during heavy pallet transfers, maintaining exact position even if plant air pressure drops unexpectedly.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X350 the Right Cylinder?
Select this 125 mm bore when you need both-way symmetric force and a massive 8600 N static hold. If your load is lighter, step down to the 100 mm bore (3681 N at 0.5 MPa, 5500 N hold); if you need even more force, 125 mm is the largest available. Always ensure your load is below 8600 N and engage the lock only after the rod stops completely, allowing at least 0.5 s for pressure balancing before release.
For the 350 mm stroke, use adequate guide rails to prevent side loads from binding the rod. Replacement parts must match the 125 mm bore, 350 mm stroke, PT1/2 port, and your specific 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 BSED125X350 FAQ
The spring-applied collet immediately engages and provides a bidirectional static holding force of 8600 N with no live air. It is a fail-safe lock, not a dynamic brake, so it only engages after the rod stops. To release, apply air to the G1/8 port after balancing both piston sides, allowing at least 0.5 s.
The double-rod design provides equal force both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, with a max drive of 819 kgf. The integrated rod lock separately provides a static holding force of 8600 N.
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Standard models usually ship in 3-4 days.
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