Airtac BSED Clamping Double Acting Cylinder BSED125X250S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X250S 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 BSED125X250S
The AirTAC BSED125X250S 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 rear rod is ideal for mounting tooling or flags while resisting rotational torque.
This unit provides a bidirectional fail-safe static holding force of 8600 N with no live air required. The lock engages via a collet mechanism and uses a separate G1/8 release port. Operating pressure is capped at 0.7 MPa, and the included -S magnet supports CMSE reed and DMSE electronic sensors.
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 BSED125X250S 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 BSED125X250S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X250S |
|---|---|
| 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 BSED125X250S
| 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 BSED125X250S Is Used
Heavy Machining Clamps
Secures large castings during CNC milling. The 8600 N lock holds the part against vibration, while the double-rod delivers 8028 N of equal clamping force.
Overhead Z-Axis Lifts
Prevents heavy vertical platens from dropping. If air pressure drops, the fail-safe collet engages instantly to hold the 125mm bore load safely.
Large Press Feeders
Feeds heavy sheet metal into a press. The rear rod mounts a flag for position confirmation, and the lock holds the material securely during the press cycle.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X250S the Right Cylinder?
Select this 125mm bore when an application demands symmetric force and high fail-safe holding. Verify your load stays under the 8600 N holding capacity. If you need less force, the 100mm bore offers 3681 N drive at 0.5 MPa and 5500 N holding; if you need more, step up to the 125mm which provides 5734 N drive and 8600 N hold. Always 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. For this 250mm stroke, ensure external guides support side loads to prevent binding. Replacement matches require the 125mm bore, 250mm stroke, PT1/2 porting, and the -S magnet.
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 BSED125X250S FAQ
The integrated rod lock is spring-applied and air-released. On air loss or an E-stop, the collet clamps the rod automatically, providing a bidirectional static holding force of 8600 N to prevent movement.
The double-rod design provides equal drive force both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, with a maximum drive of 819 kgf. The fail-safe static holding force of the lock is 8600 N.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC BSED Cylinders
Request a Quote for Airtac BSED Clamping Double Acting Cylinder BSED125X250S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.