Airtac BSAI Locking Clamp Cylinder BSAI50X225
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X225 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 BSAI50X225
The AirTAC BSAI50X225 is a double-acting ISO 15552 profile cylinder with a 50 mm bore and 225 mm stroke, featuring a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its travel, delivering a static holding force of 1400 N. Operating between 0.15 and 0.7 MPa, it generates 982 N of thrust at 0.5 MPa. Remember that holding force and thrust are separate quantities; you must size the 1400 N clamp against your static load, not the cylinder thrust. The lock is bidirectional, engaging whether the rod extended or retracted.
The clamp mechanism only engages after the cylinder has stopped, meaning it cannot brake a moving rod. Unlocking requires balanced air pressure on both sides of the piston via a third G1/8 enclasp port; otherwise, the rod may jump abruptly. Furthermore, the variable air cushion at the stroke ends only decelerates the piston to prevent impact damage, while the actual load holding is entirely managed by the clamp. This cylinder uses PT-threaded ports and lacks a standard magnet, so position sensing via CMSE or DMSE switches is not supported out of the box.
Airtac BSAI Locking Clamp Cylinder BSAI50X225 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X225 |
|---|---|
| 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 BSAI50X225 Is Used
Vertical Axis Holding
Prevents gravity-driven drops on vertical lifts by clamping the rod at any intermediate height with 1400 N of force.
Power Loss Emergency Hold
Spring-applied engagement instantly secures the load wherever the rod stopped during an unexpected air or power failure.
Machining Position Lock
Holds a workpiece rigidly in place for secondary operations or inspection without relying on continuous pneumatic pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X225 the Right Clamp-Lock?
Choose this 50 mm bore if your application requires a 1400 N static hold anywhere in the 225 mm stroke. If your load approaches this limit, step up to the 63 mm bore, which provides a 2200 N holding force and 1559 N thrust at 0.5 MPa. Conversely, lighter duties can drop to the 40 mm bore, offering 900 N holding force and 628 N thrust. Select BSAI over a SAIL model when you need mid-stroke holding; SAIL only locks at stroke ends. If no holding is needed, a plain SAI cylinder suffices.
This single-rod configuration accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The 20 mm rod and M16x1.5 thread provide robust side-load capacity, but any stroke over 300 mm requires an external guide. For safety-critical loads, add an independent mechanical measure, as the clamp is not a moving-rod brake and requires balanced pressure to unlock safely.
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 BSAI50X225 FAQ
The clamp-lock provides a static holding force of 1400 N. It engages a spring-applied gripper on the rod to hold the load securely at any position along the 225 mm stroke.
The clamp unlocks only when air pressure is balanced on both sides of the piston via the G1/8 enclasp port. The rod must be stopped first; releasing the clamp while the cylinder is under unbalanced pressure can cause the rod to jump abruptly.
Related AirTAC Lock & Standard Cylinders
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