Airtac BSAI Locking Clamp Cylinder BSAI50X250
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X250 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 250mm 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
- Stroke250 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 BSAI50X250
The AirTAC BSAI50X250 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock. It secures the 20mm carbon steel rod at any position along its 250mm stroke, delivering a static holding force of 1400 N. The cylinder generates 982 N of push thrust at 0.5 MPa, but the holding force is a separate mechanical metric sized purely against your static load, not the cylinder's pneumatic thrust.
This enclasp mechanism requires a third G1/8 unlock port alongside the 1/4 cylinder ports, operating within a 0.15-0.7 MPa range. The clamp locks only after the rod stops moving; it cannot brake a moving load. Furthermore, the variable air cushion merely decelerates the piston near stroke ends, while the clamp provides the actual position holding.
Airtac BSAI Locking Clamp Cylinder BSAI50X250 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X250 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 250 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 BSAI50X250 Is Used
Vertical Load Holding
Locks a suspended payload at any mid-stroke height on vertical axes, securely holding up to 1400 N without relying on continuous air pressure.
Power Loss Safety
Spring-applied clamping engages automatically upon air loss, freezing the 250mm stroke position to prevent uncontrolled drops.
Machining Position Hold
Secures a workpiece at a precise intermediate stroke point for machining or inspection, independent of the end-of-stroke cushions.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X250 the Right Clamp-Lock?
Step down to a 40mm bore for 628 N thrust and 900 N holding if your load is lighter, or step up to a 63mm bore for 1559 N thrust and 2200 N holding for heavier suspended masses. Choose this BSAI model over a SAIL cylinder when you must lock anywhere in the mid-stroke, rather than only at stroke ends. A plain SAI cylinder suffices if no clamping is needed.
For safe operation, unlock the clamp only when pressures are balanced or the rod is stopped, preventing abrupt jumps. This single-rod configuration accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It uses PT port threads and lacks a standard magnet; specify an -S variant if CMSE reed or DMSE solid-state sensors are required.
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 BSAI50X250 FAQ
The clamp-lock provides a static holding force of 1400 N. It is bidirectional and locks the rod at any position along the 250mm stroke, but only after the piston has stopped moving.
The clamp uses a third G1/8 port to release the spring grip. You must balance the air pressure on both sides of the piston before unlocking, otherwise the rod can jump abruptly. An independent safety measure is required for human-safety-critical loads.
Related AirTAC Lock & Standard Cylinders
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