Airtac BSED Clamping Double Acting Cylinder BSED125X25
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X25 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, 25mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke25 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X25
The AirTAC BSED125X25 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 drive force of 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 actively resisting rotational twist.
This unit provides a bidirectional fail-safe holding force of 8600 N with no live air required. If air pressure drops or an E-stop trips, the internal collet clamps the rod to secure the load. It features a 40 mm adjustable air cushion at both ends, a PT1/2 cylinder port, and a separate G1/8 lock-release port. Note that this specific SKU lacks a magnet, so 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 BSED125X25 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 BSED125X25 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X25 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 BSED125X25
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×25 | 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 BSED125X25 Is Used
Heavy Vertical Lifts
Ideal for elevating heavy machining fixtures, using the 8600 N fail-safe collet to prevent drops during air loss while providing 8028 N of equal both-way drive force.
Multi-Station Machining
The short 25 mm stroke and anti-rotation double rod excel at clamping heavy castings, with the lock holding the 819 kgf load steady during aggressive cutting cycles.
Pallet Mid-Stop
Halts heavy pallets on a transfer line; the spring-applied lock bites the rod to maintain position securely even if the main air supply is disconnected.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X25 the Right Cylinder?
Choose this 125 mm bore when an application demands massive symmetric thrust alongside fail-safe holding. Verify your load requires no more than the 8600 N static holding capacity. If you need less force, stepping down to the 100 mm bore yields 3681 N at 0.5 MPa and a 5500 N hold; if you need more, 125 mm is the largest available bore in this series.
Engage the lock only after the rod completely stops, and release it only when both piston sides are pressure-balanced, allowing at least 0.5 seconds for the transition. Since the stroke is 25 mm, side-load risks are minimal, but ensure the load is guided to prevent binding. To match this cylinder for replacement, confirm the 125 mm bore, 25 mm stroke, PT1/2 port, and non-magnet configuration.
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 BSED125X25 FAQ
The drive force is equal in both directions, providing 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The static fail-safe holding force of the spring-applied rod lock is 8600 N.
Upon air loss or an E-stop, the spring-applied collet instantly clamps the rod, delivering up to 8600 N of static holding force without live air. To release safely, ensure both piston sides are pressure-balanced and apply air to the G1/8 release port for at least 0.5 seconds.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC BSED Cylinders
Request a Quote for Airtac BSED Clamping Double Acting Cylinder BSED125X25
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.