Airtac BSAI Locking Clamp Cylinder BSAI40X800S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X800S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 800mm 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
- Stroke800 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 BSAI40X800S
The AirTAC BSAI40X800-S is a double-acting ISO 15552 profile cylinder featuring a carbon steel rod and a spring-applied, air-released clamp-lock mechanism. It secures the load at any position along its 800mm stroke, delivering a static holding force of 900 N. Because it includes a magnet, it supports CMSE reed and DMSE electronic sensors for precise position feedback.
It is crucial to distinguish this 900 N holding force from the cylinder thrust, which peaks at 879 N push at 0.7 MPa; you must size the clamp against the static load, not the dynamic thrust. The lock engages via a third G1/8 enclasp port and functions bidirectionally. Remember that the variable air cushion only decelerates the piston near stroke ends, while the clamp is the true load-holding device.
Airtac BSAI Locking Clamp Cylinder BSAI40X800S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X800S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 800 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 BSAI40X800S Is Used
Vertical Mid-Stroke Hold
Secures a 40mm bore vertical lift at any point in the 800mm travel, providing a reliable 900 N hold during power loss without relying on the air cushion.
Emergency Safety Stop
Locks the carbon steel rod instantly after the cylinder stops moving, preventing unexpected drops on long-stroke vertical axes when air pressure is removed.
Machining Position Lock
Holds a workpiece rigidly at a custom position along the stroke for machining or inspection, ensuring stability independent of the 879 N dynamic thrust.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X800S the Right Clamp-Lock?
Choose this 40mm bore when an application requires a mid-stroke emergency hold that a plain SAI cannot provide, or when SAIL is insufficient because it only locks at stroke ends. If your load exceeds 900 N, step up to the 50mm bore, which provides 982 N push thrust at 0.5 MPa and a 1400 N holding force. Conversely, lighter loads can use the 32mm bore with its 600 N hold.
This model operates safely between 0.15 and 0.7 MPa. The clamp locks only after the rod has stopped, meaning it cannot brake a moving load, and it must be unlocked with balanced piston pressures to prevent the rod from jumping abruptly. For safety-critical operations, add an independent external measure. This unit uses PT tapered ports and accepts BSAI mountings including Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Because the 800mm stroke is long, external guidance is recommended to manage side loads.
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 BSAI40X800S FAQ
The BSAI40X800-S provides a static holding force of 900 N. This clamp is spring-applied and air-released via a G1/8 port, allowing it to lock the rod securely at any position along the 800mm stroke, unlike SAIL cylinders which only hold at the ends.
The clamp locks only after the cylinder has stopped, so it cannot brake a moving rod. It must be unlocked by balancing the air pressure on both sides of the piston; otherwise, the rod may move abruptly. For human safety applications, an additional independent safety measure is required.
Related AirTAC Lock & Standard Cylinders
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