Airtac BSAI Locking Clamp Cylinder BSAI40X25S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X25S is a genuine double-acting ISO 15552 cylinder with a Ø40mm 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 900 N.
- BoreØ40 mm
- Stroke25 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM12×1.25
- 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 BSAI40X25S
The AirTAC BSAI40X25-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It delivers 628N of thrust at 0.5MPa and features a single carbon steel rod with an M12x1.25 thread. The integrated enclasp mechanism grips the rod securely at any position along its 25mm travel, providing a documented static holding force of 900N. A -S magnet is included for position sensing.
It is vital to distinguish this 900N holding force from the cylinder thrust; the clamp secures a static load, whereas thrust dictates movement capability. The clamp operates via a third G1/8 enclasp port and locks only after the piston has completely stopped, meaning it cannot brake a moving rod. Furthermore, the variable air cushion at the stroke ends only decelerates the piston and does not contribute to the holding force.
Airtac BSAI Locking Clamp Cylinder BSAI40X25S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X25S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 900 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 800 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 (Ø40 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (900 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI40X25S Is Used
Vertical Load Holding
Maintains a 900N vertical load at any intermediate height without relying on continuous air pressure.
Power Loss Arrest
Spring-applied clamp instantly engages upon air loss to freeze the rod exactly where it stopped.
Machining Position Hold
Secures the workpiece firmly in a specific intermediate position for precise drilling or inspection.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X25S the Right Clamp-Lock?
Choose this 40mm bore model when you need to arrest a load mid-stroke rather than just at the end positions, a scenario where a plain SAI cylinder or a stroke-end-only SAIL lock falls short. If your load requires less holding power, stepping down to the 32mm bore reduces the holding force to 600N and thrust to 402N at 0.5MPa. Conversely, heavier loads justify upgrading to the 50mm bore for 1400N holding force and 982N thrust.
This BSAI40X25-S configuration includes PT tapered ports and a -S magnet compatible with CMSE reed and DMSE solid-state sensors. It supports Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. For safe operation, always balance the air pressure on both sides of the piston before unlocking to prevent abrupt rod jumps, and add an independent safety measure for human-safety-critical applications.
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 BSAI40X25S FAQ
The integrated enclasp clamp provides a static holding force of 900N. It holds the load at any position along the stroke, but only engages after the cylinder has stopped moving.
Unlike SAIL which only locks at stroke ends, this BSAI locks anywhere. To unlock safely, balance air pressure on both sides of the piston via the G1/8 enclasp port to prevent the rod from jumping abruptly.
Related AirTAC Lock & Standard Cylinders
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