Airtac BSE Clamp Standard Cylinder BSE125X300
The AirTAC Airtac BSE Clamp Standard Cylinder BSE125X300 is a genuine double-acting ISO 15552 cylinder with an integrated spring-applied, air-released ROD LOCK. If air is cut or an E-stop is hit, the collet clamps the Ø32mm rod and holds up to 8600 N in either direction — no drift. Ø125mm bore, 300mm stroke, PT1/2 cylinder ports, G1/8 lock-release port.
- BoreØ125 mm
- Stroke300 mm
- Static holding force8600 N
- Lock typeSpring-lock / air-release
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSE Clamp Standard Cylinder BSE125X300
The AirTAC BSE125X300 is a double-acting ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. It delivers a robust 8590 N drive force while providing an 8600 N bidirectional fail-safe hold. If air is exhausted or an E-stop trips, the collet clamps the 32 mm rod instantly, holding the load securely in both directions with zero live air.
Operating pressure is capped at 0.7 MPa, and the lock unlocks via a separate G1/8 port. The lock is a static holding device, not a dynamic brake; engage it only after the rod fully stops. This 300 mm stroke SKU lacks a magnet, so it does not support CMSE or DMSE position sensors. SE mounting accessories fit this body perfectly, except for the FTC variant.
Rod Lock — 8600 N Static Holding (Ø125mm)
A spring clamps the collet onto the rod, so the Airtac BSE Clamp Standard Cylinder BSE125X300 holds its position in both directions when air is lost, exhausted or an E-stop trips. Apply 0.15–0.7 MPa to the G1/8 release port to unlock. Engage the lock only after the rod has stopped (it is not a dynamic brake), and release only when the pressures on both sides of the piston are balanced. Allow at least 0.5 s for full release before moving.
Airtac BSE Clamp Standard Cylinder BSE125X300 Technical Specifications
| Model | Airtac BSE Clamp Standard Cylinder BSE125X300 |
|---|---|
| Series | BSE ISO 15552 rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 mm |
| Static holding force | 8600 N |
| Cylinder port | PT1/2 |
| Lock-release port | G1/8 |
| Rod thread | M27×2 |
|---|---|
| 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 |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1000 mm |
Specifications follow the official AirTAC BSE datasheet. The lock uses the SE standard body; SE mounting accessories fit BSE except FTC. Port options: PT (standard) / G (BSPP); lock-release port is G1/8.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
| Max drive (@0.7 MPa) | 876 kgf | |
Drive force is separate from the 8600 N static holding force of the lock. BSE operates up to 0.7 MPa. Size with a safety margin.
Model Code: Airtac BSE Clamp Standard Cylinder BSE125X300
| B | Rod-lock cylinder prefix. |
|---|---|
| SE | ISO 15552 standard double-acting body. |
| 125 | Bore size in mm. |
| ×300 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensor sensing. |
Thread: PT (blank) / G. Mounting (BSE): Basic, LB, FA, FB, CA, CB, CR, TC (FTC is not available on BSE). Related: SE (no lock), BSED (double-rod rod lock). Sensors CMSE/DMSE fit magnetic BSE.
Where the Airtac BSE Clamp Standard Cylinder BSE125X300 Is Used
Heavy Vertical Lift
Holds a 8600 N vertical machining axis in place during air loss, preventing a heavy spindle head from crashing down.
Press Tool Clamp
Secures a large stamping die with 8590 N of drive force and locks it immobile during an E-stop to prevent movement.
Pallet Stop Gate
Halts heavy pallets on an assembly line and maintains a rigid 8600 N stop block even if the facility air supply drops.
Is the Airtac BSE Clamp Standard Cylinder BSE125X300 the Right Cylinder?
Verify your load requires no more than the 8600 N static holding force. If you need less holding capacity, step down to the 100 mm bore, which provides a 5500 N hold and a 3927 N push at 0.5 MPa. If you need more drive force, note that 125 mm is the largest standard BSE bore available, offering a max drive of 876 kgf at 0.7 MPa. Always balance pressures on both sides of the piston before releasing the lock, and allow at least 0.5 s for full release before moving. Because this stroke is 300 mm, use external guides to prevent side loads from damaging the seals. To replace this unit, match the 125 mm bore, 300 mm stroke, PT1/2 port, and basic mounting.
Quick checklist
- ✓ Load to hold ≤ 8600 N?
- ✓ Fail-safe hold on air loss / E-stop needed
- ✓ Lock engaged only when stopped
- ✓ G1/8 release-air line available
- ✓ Magnet (-S) for CMSE/DMSE sensors?
Installation & Safety Notes
- check Engage the lock only after the rod has stopped — not as 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 Add safety-rated controls for man-rated / overhead loads.
- check Use SE mounting accessories (FTC excepted).
Airtac BSE Clamp Standard Cylinder BSE125X300 FAQ
The spring-applied collet instantly clamps the 32 mm rod, providing an 8600 N bidirectional static hold with no live air. It is a fail-safe lock, not a dynamic brake, so it only engages after the rod stops.
The lock provides an 8600 N static hold. The drive forces are 6136 N push at 0.5 MPa, 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and a maximum drive of 876 kgf at 0.7 MPa.
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