Airtac BSAI Locking Clamp Cylinder BSAI80X250S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI80X250S is a genuine double-acting ISO 15552 cylinder with a Ø80mm 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 3600 N.
- BoreØ80 mm
- Stroke250 mm
- Cylinder portG3/8
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM20×1.5
- 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 BSAI80X250S
The AirTAC BSAI80X250-S is a double-acting ISO 15552 profile cylinder equipped with a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 250mm travel, delivering a robust static holding force of 3600 N. This bidirectional enclasp mechanism engages firmly whether the rod was extending or retracting. The base cylinder generates 2513 N of thrust at 0.5 MPa (3518 N at 0.7 MPa), but buyers must distinguish between thrust and holding force: the 3600 N clamp rating dictates load capacity during a halt, not the pneumatic push force.
A critical distinction is that the adjustable air cushions only decelerate the piston near stroke ends, whereas the clamp is the true load-holding device. The lock requires a third G1/8 enclasp port alongside the 3/8 cylinder ports, operating within a 0.15-0.7 MPa range. Fitted with a magnet (-S), it supports CMSE reed and DMSE solid-state sensors for position feedback. The clamp locks only after the rod completely stops, meaning it cannot brake a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI80X250S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI80X250S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø80 mm |
| Stroke | 250 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G3/8 |
| Rod thread | M20×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 3600 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 (Ø80 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa (max) | 3519 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (3600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI80X250S Is Used
Vertical Axis Hold
Prevents gravity-induced drops on vertical lifts by clamping the rod securely at any height during air pressure loss.
Power Failure Safety
Locks the load instantly wherever it sits in the 250mm travel when electrical supply to the pneumatic system is interrupted.
Machining Position Hold
Freezes the workpiece at a precise intermediate location for secure drilling or inspection without continuous air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI80X250S the Right Clamp-Lock?
Step down to a 63mm bore if your static load is under 1402 N (pull) or 2200 N holding force, or step up to a 100mm bore for 3681 N thrust and 5500 N holding capacity. Choose this BSAI over a SAIL model when you need to freeze the rod mid-stroke rather than solely at the end. If the application only requires standard end-of-stroke positioning, a plain SAI cylinder without a lock suffices. For replacements, match the 80mm bore, 250mm stroke, PT port threads, and the single-rod mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). The 25mm rod and M20x1.5 thread handle high side loads well, but since this 250mm stroke is under 300mm, external guidance is only required for heavy lateral forces.
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 BSAI80X250S FAQ
It provides a static holding force of 3600 N and locks at any position along the stroke. The clamp is bidirectional and spring-applied, holding the rod securely whether it was extending or retracting.
The clamp locks only after the cylinder has stopped and cannot brake a moving rod. It must be unlocked by applying 0.15-0.7 MPa to the G1/8 enclasp port with balanced pressure on both piston sides, otherwise the rod may jump abruptly. Safety-critical applications require an independent backup measure.
Related AirTAC Lock & Standard Cylinders
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