Airtac BSAI Locking Clamp Cylinder BSAI50X25S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X25S is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 25mm stroke and a spring-applied, air-released clamp-lock that holds the rod at ANY position along its travel — with a static holding force of 1400 N.
- BoreØ50 mm
- Stroke25 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM16×1.5
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BSAI Locking Clamp Cylinder BSAI50X25S
The AirTAC BSAI50X25-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock that secures the carbon steel rod at any position along its 25 mm stroke. It delivers 982 N of push thrust at 0.5 MPa, but the defining feature is its 1400 N static holding force. Buyers must distinguish between these two quantities: cylinder thrust drives the load in motion, while the clamp holding force resists a static dead load.
This bidirectional enclasp mechanism locks the rod whether it was extending or retracting, but it only engages after the piston has stopped, serving as a position hold rather than a moving-rod brake. Unlocking requires balanced air pressure across the piston via the dedicated G1/8 enclasp port, preventing abrupt rod jumps upon release. The integrated variable air cushion decelerates the piston near stroke ends, yet it is the mechanical clamp, not the cushion, that ultimately holds the load.
Airtac BSAI Locking Clamp Cylinder BSAI50X25S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X25S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 25 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 1400 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Max stroke | Up to 1000 mm |
Specifications follow the official AirTAC BSAI datasheet (ISO 15552). Operating pressure is 0.15–0.7 MPa (lower than a plain SAI). Port options: PT / G.
How the Clamp-Lock Holds
static holding force (Ø50 mm)
A spring-applied gripper clamps the rod and holds the load at any position in the stroke — not just at the stroke end (that is a SAIL) — and it is bidirectional: it holds whether the rod was extending or retracting.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa (max) | 1374 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (1400 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI50X25S Is Used
Vertical Axis Mid-Stroke Hold
Secures a 50 mm bore lifting payload at any intermediate height with 1400 N of holding force, preventing gravity drops during air pressure loss.
Machining Position Lock
Clamps the carbon steel rod rigidly in place for a machining or inspection process, ensuring the workpiece does not shift under lateral tooling pressure.
Emergency Drop Prevention
Acts as a fail-safe enclasp that engages only after the cylinder stops, holding the load steady until balanced pressure is restored to the G1/8 unlock port.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X25S the Right Clamp-Lock?
Choose this 50 mm bore when an application requires 982 N of thrust to move a load but 1400 N of static holding security mid-stroke. If you only need to hold the load at the fully extended or retracted stroke end, a plain SAIL stroke-end lock cylinder suffices, whereas the BSAI series is necessary for intermediate locking. If your load is lighter, stepping down to a 40 mm bore provides 628 N thrust and 900 N holding force; for heavier loads, a 63 mm bore offers 1559 N thrust and 2200 N holding force.
Because human safety cannot rely solely on this clamp, an independent external safety measure is required for critical vertical loads. This BSAI50X25-S features PT tapered ports, a 1/4 cylinder port, a 20 mm rod with an M16x1.5 thread, and a -S magnet for precise position sensing with AirTAC CMSE (reed) or DMSE (electronic) switches. It supports Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mountings, giving you broad ISO 15552 interchangeability for fixture design.
Quick checklist
- ✓ Hold needed at any position?
- ✓ Or stroke-end only → use SAIL
- ✓ Holding force ≥ your load
- ✓ Balanced-pressure unlock circuit
- ✓ Extra safety measure for people
Airtac BSAI Locking Clamp Cylinder BSAI50X25S FAQ
The BSAI50X25-S provides a static holding force of 1400 N. This bidirectional clamp locks the rod at any position along the 25 mm stroke, but it only engages after the cylinder has stopped moving and cannot be used to brake a moving rod.
The clamp is spring-applied and air-released through a dedicated G1/8 enclasp port. To prevent the rod from jumping abruptly, you must apply 0.15-0.7 MPa of unlock pressure only after the air pressures on both sides of the piston are balanced or the cylinder has stopped.
Related AirTAC Lock & Standard Cylinders
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