Airtac BSED Clamping Double Acting Cylinder BSED125X400
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X400 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 BSED125X400
The AirTAC BSED125X400 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 force in both directions—specifically 5734 N each way at 0.5 MPa and 8028 N at 0.7 MPa. The rear rod provides a stable platform for mounting flags or cams while resisting rotation.
This unit provides a bidirectional fail-safe static holding force of 8600 N without requiring live air. If pressure drops or an E-stop trips, the collet clamps the rod to secure the load. It features a 400 mm stroke, PT1/2 cylinder ports, a separate G1/8 lock-release port, and 40 mm adjustable air cushions at both ends. This SKU has no magnet, meaning position sensing is not supported.
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 BSED125X400 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 BSED125X400 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X400 |
|---|---|
| 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 BSED125X400
| 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 BSED125X400 Is Used
Heavy Vertical Lift Platforms
Lifts heavy vertical stages using the equal 8028 N both-way drive force, relying on the 8600 N spring-applied collet to hold the load securely in place during an air loss event.
Large Machining Fixtures
Clamps heavy cast parts for machining, utilizing the double-rod design for anti-rotation stability while the fail-safe lock prevents workpiece movement if workshop air pressure drops.
Pallet Stops and Diverters
Halts heavy pallets on high-mass conveyors, using the symmetric push and pull force to position stops precisely, while the rod lock holds the stop rigidly against accumulated product weight.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X400 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires both-way symmetric drive force up to 8028 N and fail-safe holding up to 8600 N. If your load requires less force, stepping down to the 100 mm bore offers 3681 N at 0.5 MPa and a 5500 N holding capacity. If you need more drive force, this 125 mm is the largest standard BSED size available, yielding a maximum drive of 819 kgf at 0.7 MPa. Always verify your static load is at or below 8600 N.
For a 400 mm stroke, ensure external guide rails are used to support the rod and prevent excessive side-loading, which could damage the seals and the lock collet. To release the lock safely, balance pressure on both piston sides first, apply air to the G1/8 release port, and wait at least 0.5 seconds before commanding motion. When replacing, match the 125 mm bore, 400 mm stroke, PT1/2 port thread, and mounting style (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 BSED125X400 FAQ
The double-rod design 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 bidirectional static holding force of 8600 N with no live air required.
The collet is spring-applied and air-released. If air is lost or an E-stop trips, the collet clamps the rod, holding the load up to 8600 N. It is not a dynamic brake; you must engage it only after the rod stops, and release it only when both piston sides are pressure-balanced, allowing at least 0.5 seconds before moving.
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