Airtac BSED Clamping Double Acting Cylinder BSED125X900S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X900S 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, 900mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke900 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X900S
The AirTAC BSED125X900S is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A rod exits both ends, delivering equal drive force in both directions—about 5734 N each way at 0.5 MPa. The collet lock delivers an 8600 N static holding force, clamping the 32 mm rod bidirectionally with zero live air.
This 125 mm bore unit runs at 30-500 mm/s and uses a PT1/2 cylinder port alongside a dedicated G1/8 lock-release port. The -S magnet supports CMSE reed and DMSE electronic sensors. It is a fail-safe holding device, not a dynamic brake; engage it only after the rod stops, and allow at least 0.5 s for the release cycle.
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 BSED125X900S 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 BSED125X900S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X900S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 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 BSED125X900S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×900 | 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 BSED125X900S Is Used
Heavy Vertical Lifts
Holds massive vertical platens securely with 8600 N of fail-safe force during air loss, while the 8028 N both-way drive raises and lowers the load with equal power.
Large Press Indexing
Provides the 5734 N symmetric thrust needed to shift heavy press tooling both directions, locking the 32 mm rod instantly when motion stops.
Pallet Accumulation
Uses the rear exiting rod to mount a physical flag for position confirmation, while the collet lock halts 125 mm bore loads safely without needing live air.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X900S the Right Cylinder?
Select this 125 mm bore model when your application demands both symmetric thrust and fail-safe holding. The 8600 N holding force safely secures heavy vertical loads during E-stops or air loss. If sizing down, the 100 mm bore offers 3681 N drive force at 0.5 MPa and a 5500 N hold; as the largest available bore, there is no larger neighbor. The 900 mm stroke requires a guide to prevent side-loading damage to the 40 mm cushions. Match replacements by 125 mm bore, 900 mm stroke, PT thread, and -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 BSED125X900S FAQ
The drive force is equal both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, yielding a max drive of 819 kgf. The integrated spring-applied rod lock provides an 8600 N static holding force with no live air.
The lock is a static holding device, not a dynamic brake. Engage it only after the rod stops. To release, pressure-balance both piston sides and apply air to the G1/8 release port, allowing at least 0.5 seconds for the collet to open.
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