Airtac BSED Clamping Double Acting Cylinder BSED125X300S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X300S 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, 300mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke300 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X300S
The AirTAC BSED125X300S is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A rod exits both ends, providing equal thrust and speed in both directions. You get about 5734 N of drive force each way at 0.5 MPa, and a massive 8600 N static holding force.
The fail-safe collet clamps the 32mm rod bidirectionally whenever air is lost or an E-stop trips, requiring no live air to maintain position. Unlike a dynamic brake, you must 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 the transition. The lock uses a separate G1/8 release port, while the main cylinder operates on a PT1/2 port at 0.15-0.7 MPa.
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 BSED125X300S 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 BSED125X300S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X300S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 BSED125X300S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×300 | 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 BSED125X300S Is Used
Heavy Press E-Stop Safety
Secures a 4000N press fixture during an E-stop. The 8600N holding force locks the 32mm rod instantly on air loss, while the 8028N both-way drive handles the heavy press motion.
Large Vertical Lift Hold
Prevents a 7000N vertical load from dropping when air pressure drops. The spring-applied collet engages without live air, and the double-rod design resists rotation during the 300mm lift.
Multi-Position Machining Clamp
Clamps a heavy casting across a 300mm stroke. The equal both-way force ensures consistent clamping and retraction, while the fail-safe lock holds the 819kgf load during machining.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X300S the Right Cylinder?
Choose this 125mm bore when you need to secure heavy loads up to 8600 N in a static hold, alongside 8028 N of equal both-way drive force at 0.7 MPa. If your load is lighter, the next size down is the 100mm bore, offering 3681 N drive force at 0.5 MPa and a 5500 N holding force. If you need even more force, this is the largest standard ISO 15552 bore in the BSED range.
For safety, engage the lock only after the rod completely stops, and release it only when both piston sides are pressure-balanced. This 300mm stroke model requires a side-load guide to prevent rod binding and premature seal wear. When replacing a unit, match the 125mm bore, 300mm stroke, PT1/2 thread, and the -S magnet option for CMSE reed or DMSE electronic sensors.
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 BSED125X300S FAQ
The spring-applied collet instantly clamps the rod, providing a bidirectional static holding force of 8600 N with no live air. The lock holds the load in place, but it is not a dynamic brake; you must engage it only after the rod stops.
The BSED125X300S provides equal drive force in both directions: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The integrated fail-safe rod lock provides a separate static holding force of 8600 N.
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