Airtac BSAI Locking Clamp Cylinder BSAI50X225S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X225S is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 225mm 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
- Stroke225 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 BSAI50X225S
The AirTAC BSAI50X225-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It secures a carbon steel piston rod at any point along its 225 mm stroke, delivering a static holding force of 1400 N. Because the base cylinder is an extruded aluminum profile type, it integrates cleanly into standard machinery using interchangeable ISO 15552 mounting dimensions. The -S suffix indicates an integrated magnet for position sensing with AirTAC CMSE reed or DMSE solid-state switches.
It is vital to distinguish holding force from thrust: the 1400 N clamp grip is a separate static metric from the 982 N push thrust at 0.5 MPa. The clamp locks only after the rod stops, meaning it cannot brake a moving load. Additionally, the variable air cushion at the stroke ends only decelerates the piston; it does not hold the load. Unlocking requires a third G1/8 enclasp port and balanced air pressure on both sides of the piston to prevent abrupt rod movement upon release.
Airtac BSAI Locking Clamp Cylinder BSAI50X225S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X225S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 225 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 BSAI50X225S Is Used
Mid-Stroke Vertical Hold
Maintains a 1400 N static hold on a vertical lifting axis at any intermediate position without relying on continuous air pressure.
Power-Loss Safety Lock
Spring-applied clamp engages instantly when air supply drops, freezing the 50 mm bore rod exactly where it stopped.
Machining Position Restraint
Secures a workpiece firmly in place during drilling or inspection processes, preventing unwanted rod drift.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X225S the Right Clamp-Lock?
Choose this 50 mm bore when 982 N of thrust at 0.5 MPa (or 1374 N at 0.7 MPa) is sufficient to move your load, but a 1400 N static hold is required to keep it parked mid-stroke. If your application only needs holding at the fully extended or retracted end, a plain SAI or SAIL stroke-end lock cylinder is simpler. If you need to halt a moving rod dynamically, this series will not suffice and an external brake is required. For safety-critical vertical loads, always add an independent mechanical restraint, as the clamp holds only after the cylinder stops and must be unlocked with balanced pressures.
This BSAI50X225-S configuration features a 20 mm carbon steel rod with an M16x1.5 thread, PT tapered port threads (1/4 cylinder port, G1/8 enclasp port), and an -S magnet for CMSE/DMSE sensors. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The 225 mm stroke is a standard length, but at this extension you should verify external side-load guidance to protect the rod seals.
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 BSAI50X225S FAQ
The spring-applied clamp-lock provides a static holding force of 1400 N. It engages to hold the 20 mm carbon steel rod securely at any position along the 225 mm stroke, but only after the cylinder has come to a complete stop.
The clamp is released via a third G1/8 enclasp port. You must apply air to this port while ensuring the pressures on both sides of the piston are balanced; otherwise, the rod can move abruptly upon unlock. The variable air cushion only decelerates the piston and does not contribute to holding the load.
Related AirTAC Lock & Standard Cylinders
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