Airtac BSAI Locking Clamp Cylinder BSAI40X800
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X800 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 BSAI40X800
The AirTAC BSAI40X800 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It delivers 628 N of push thrust at 0.5 MPa, but the defining feature is its ability to lock the piston rod at any position along its 800 mm travel. The integrated enclasp gripper provides a bidirectional static holding force of 900 N. It is crucial to distinguish this holding force from the cylinder thrust: you must size the 900 N clamp capacity against your static load weight, independent of the 628 N pneumatic thrust.
This model features a 16 mm carbon steel rod and uses PT tapered threading for its 1/4 cylinder ports. A third G1/8 enclasp port manages the unlock function. Remember that the variable air cushions at the stroke ends only decelerate the piston; the mechanical clamp is what actually secures the load. Furthermore, the clamp locks only after the rod has stopped and requires balanced air pressure to release safely, preventing abrupt rod jumping.
Airtac BSAI Locking Clamp Cylinder BSAI40X800 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X800 |
|---|---|
| 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 BSAI40X800 Is Used
Vertical Axis Hold
Secures a 900 N vertical load at any intermediate height along the 800 mm stroke without relying on continuous live air pressure.
Power Loss Safety
The spring-applied clamp engages automatically upon air loss, freezing the rod exactly where it stopped to prevent uncontrolled drops.
Machining Position Lock
Holds a workpiece steady at a custom mid-stroke location for machining or inspection, functioning independently of the end-of-stroke cushions.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X800 the Right Clamp-Lock?
Choose this BSAI40X800 when an application requires intermediate position holding that a stroke-end lock (like SAIL) cannot provide, or step down to a BSAI32X800 for lighter loads (402 N thrust, 600 N holding force). If no intermediate locking is needed at all, a plain SAI cylinder suffices. Because this stroke is 800 mm, the extended 16 mm rod requires external guide support to prevent excessive side-loading. The clamp is not a brake for moving rods; it engages only after the cylinder stops, and safety-critical loads require an independent backup measure. To unlock safely, balance the air pressure on both sides of the piston via the G1/8 port before retracting the clamp. This single-rod configuration supports Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Note that this unit uses standard PT ports and lacks a magnet for CMSE or DMSE sensors.
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 BSAI40X800 FAQ
The integrated clamp-lock provides a static holding force of 900 N. This is separate from the 628 N pneumatic thrust, and it holds the rod bidirectionally at any point along the 800 mm travel.
No, the clamp locks only after the rod has stopped; it is not a dynamic brake. Additionally, you must balance the air pressure on both sides of the piston via the G1/8 port before unlocking, or the rod may jump abruptly.
Related AirTAC Lock & Standard Cylinders
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