Airtac BSE Clamp Standard Cylinder BSE40X250S
The AirTAC Airtac BSE Clamp Standard Cylinder BSE40X250S 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 Ø16mm rod and holds up to 900 N in either direction — no drift. Ø40mm bore, 250mm stroke, PT1/4 cylinder ports, G1/8 lock-release port.
- BoreØ40 mm
- Stroke250 mm
- Static holding force900 N
- Lock typeSpring-lock / air-release
- Cylinder portPT1/4
- Lock-release portG1/8
About the Airtac BSE Clamp Standard Cylinder BSE40X250S
The AirTAC BSE40X250S is a double-acting ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A collet clamps the Ø16 mm piston rod to deliver a bidirectional static holding force of 900 N with zero live air required. This fail-safe mechanism ensures suspended loads stay exactly where they stopped if air pressure drops or an E-stop is hit.
Operating pressure is capped at 0.7 MPa, and the lock unlocks via a separate G1/8 port. The -S suffix denotes a magnet for position sensing using CMSE reed or DMSE electronic sensors. The lock is a holding device, not a dynamic brake; you must engage it only after the rod fully stops and release it only when piston pressures are balanced.
Rod Lock — 900 N Static Holding (Ø40mm)
A spring clamps the collet onto the rod, so the Airtac BSE Clamp Standard Cylinder BSE40X250S 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 BSE40X250S Technical Specifications
| Model | Airtac BSE Clamp Standard Cylinder BSE40X250S |
|---|---|
| Series | BSE ISO 15552 rod-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Static holding force | 900 N |
| Cylinder port | PT1/4 |
| Lock-release port | G1/8 |
| Rod thread | M12×1.25 |
|---|---|
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 800 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
| Max drive (@0.7 MPa) | 90 kgf | |
Drive force is separate from the 900 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 BSE40X250S
| B | Rod-lock cylinder prefix. |
|---|---|
| SE | ISO 15552 standard double-acting body. |
| 40 | Bore size in mm. |
| ×250 | 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 BSE40X250S Is Used
Vertical Pallet Lifters
Holds a raised pallet securely in place with 900 N of fail-safe clamping force, preventing a crash if the compressed air supply suddenly exhausts during a power failure.
Spindle Tool Clamps
Locks the tool holder at 250 mm stroke with no live air, ensuring the machining head stays positioned even if the main air line is disconnected for maintenance.
Pallet Stopper Gates
Provides a hard stop on an assembly line conveyor. The spring-applied collet keeps the gate extended during an E-stop, safely halting product flow.
Is the Airtac BSE Clamp Standard Cylinder BSE40X250S the Right Cylinder?
Verify your load does not exceed the 900 N static holding force. If you need less holding capacity, the 32 mm bore offers 402 N push at 0.5 MPa and a 600 N hold. If your load is higher, step up to the 50 mm bore, which provides 982 N push at 0.5 MPa and a 1400 N hold.
For this 250 mm stroke, use guide rails to prevent side-load damage to the seals. When replacing a unit, match the 40 mm bore, 250 mm stroke, PT1/4 cylinder port, and magnet option. All SE mounting accessories fit this body except FTC brackets.
Quick checklist
- ✓ Load to hold ≤ 900 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 BSE40X250S FAQ
The drive force is 628 N push and 528 N pull at 0.5 MPa, and 879 N push at 0.7 MPa (max 90 kgf). The static holding force of the lock is 900 N. Drive force moves the load; the holding force keeps it from moving when stopped.
The lock is spring-applied, so a collet immediately clamps the rod to hold the load bidirectionally at 900 N. To release it, apply 0.15-0.7 MPa to the G1/8 release port and wait at least 0.5 seconds after pressures balance before moving.
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