Airtac BSED Clamping Double Acting Cylinder BSED125X125S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X125S 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 BSED125X125S
The AirTAC BSED125X125S is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A rod exits both ends, yielding equal force in both directions—about 5734 N each way at 0.5 MPa. The rear rod provides a stable platform for mounting flags, cams, or tooling while actively resisting rotation.
This fail-safe collet lock delivers an 8600 N static holding force with no live air required. If pressure drops or an E-stop trips, the rod clamps bidirectionally to hold position. Operating pressure is capped at 0.7 MPa, and the lock releases via a dedicated G1/8 port once piston sides are pressure-balanced.
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 BSED125X125S 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 BSED125X125S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X125S |
|---|---|
| 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 BSED125X125S
| 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 BSED125X125S Is Used
Heavy Machining Fixtures
Clamps heavy cast parts with 8028 N of equal both-way force, while the 8600 N rod lock holds the fixture securely during machining interruptions.
Vertical Pallet Lifters
Lifts loaded pallets symmetrically using the double-rod design, relying on the fail-safe collet to prevent gravity-driven drops if air pressure is lost.
Large Press Feeders
Feeds heavy steel blanks into a press with consistent push and pull force, engaging the spring-applied lock to hold position during press cycling.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X125S the Right Cylinder?
Select this 125 mm bore when your application requires symmetric drive force and robust fail-safe holding. Verify your load requires holding at or below 8600 N. If you need less force, step down to the 100 mm bore (3681 N drive @0.5 MPa, 5500 N hold). As the largest available bore, stepping up is not an option. Engage the lock only after the rod stops, and allow at least 0.5 s for release when balanced. For exact replacement, match the 125 mm stroke, PT1/2 port, and your specific mounting (Basic, LB, FA, TC). The -S magnet supports CMSE reed and 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 BSED125X125S FAQ
The double-rod drive force is equal both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The separate static holding force of the fail-safe rod lock is 8600 N.
The spring-applied collet clamps the rod immediately upon air loss, providing an 8600 N bidirectional static hold. To release safely, ensure both piston sides are pressure-balanced, apply air to the G1/8 release port, and wait at least 0.5 s before moving.
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