Airtac BSED Clamping Double Acting Cylinder BSED125X125
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X125 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, 125mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke125 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X125
The AirTAC BSED125X125 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. This symmetric design is ideal for carrying rear-rod tooling or flags while resisting rotation.
The fail-safe collet mechanism delivers an 8600 N static holding force with no live air required. It uses a dedicated G1/8 release port and caps operating pressure at 0.7 MPa. This SKU is built without a magnet, meaning it does not support CMSE or DMSE position 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 BSED125X125 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 BSED125X125 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X125 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 BSED125X125
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×125 | 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 BSED125X125 Is Used
Heavy Press Tooling
Drives large press fixtures using its equal 8028 N both-way force, while the 8600 N rod lock firmly secures the heavy tooling in place during air loss.
Overhead Z-Axis Lift
Lifts substantial vertical loads with 819 kgf max drive force, relying on the fail-safe collet to prevent drops if air pressure drops unexpectedly.
Rigid Alignment Stop
Uses the dual-rod anti-rotation特性 to keep heavy jigs perfectly aligned, engaging the 8600 N static hold to lock the position securely during machining.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X125 the Right Cylinder?
Select this 125 mm bore when you need both-way symmetric thrust up to 819 kgf and fail-safe holding up to 8600 N. If your load requires less force, the neighboring 100 mm bore provides 3681 N at 0.5 MPa and 5500 N holding. As the largest standard size, stepping up requires a custom solution. Ensure the load is strictly <= 8600 N and engage the lock only after the rod fully stops.
For release, balance pressure on both piston sides and allow at least 0.5 seconds before moving. This model features a PT1/2 cylinder port, a 32 mm rod with an M27x2 thread, and 40 mm adjustable cushions at both ends. When replacing, match the 125 mm stroke, basic mounting (Basic, LB, FA, or TC), and confirm no sensor magnet is needed.
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 BSED125X125 FAQ
The drive force is equal in both directions: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The static fail-safe holding force of the integrated rod lock is 8600 N.
The spring-applied collet clamps the rod automatically if air is lost, holding up to 8600 N. To release, apply air to the G1/8 port after balancing pressure on both piston sides, allowing at least 0.5 seconds before cycling.
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