Airtac BSAI Locking Clamp Cylinder BSAI125X600S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X600S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 600mm 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 8600 N.
- BoreØ125 mm
- Stroke600 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X600S
The AirTAC BSAI125X600-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It secures the load at any position along its 600 mm stroke, delivering a robust static holding force of 8600 N. Because this is a single-rod configuration, the forward thrust reaches 6136 N at 0.5 MPa (8590 N at the 0.7 MPa practical maximum). You must size the holding capacity against the static load, as the 8600 N clamp force is a separate metric from the cylinder's travel thrust.
This model includes a -S magnet for precise position sensing with AirTAC CMSE (reed) and DMSE (electronic) switches. The clamp mechanism relies on a dedicated G1/8 enclasp port, which is distinct from the 1/2 inch cylinder drive ports. Furthermore, the variable air cushions at the stroke ends only decelerate the piston; they do not hold the load. The clamp itself engages strictly after the rod has come to a complete stop.
Airtac BSAI Locking Clamp Cylinder BSAI125X600S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X600S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 600 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 8600 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 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 (Ø125 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (8600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI125X600S Is Used
Mid-Stroke Machining Hold
Secures heavy workpieces at an exact intermediate point along the 600 mm travel for multi-axis machining operations without relying on stroke-end cushions.
Vertical Load Arrest
Prevents heavy vertical payloads from dropping on air loss by clamping the rod instantly at whatever height it was stopped, providing 8600 N of holding security.
Safety Positioning
Maintains a locked position during inspection processes or emergency stops, ensuring the load remains entirely stationary until balanced pressure is deliberately applied.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X600S the Right Clamp-Lock?
Choose this 125 mm bore when an application demands extreme holding capacity that a smaller bore cannot provide, such as stepping down from this size to the 100 mm bore (which offers 5500 N holding force and 3927 N thrust at 0.5 MPa). The BSAI125X600-S is preferred over a SAIL model when you need to lock the rod at an intermediate point in the travel rather than solely at the stroke end. If no mid-stroke holding is required, a plain SAI cylinder suffices.
For safe operation, remember the clamp locks only after the cylinder has stopped moving and cannot act as a dynamic brake. It must be unlocked with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly. For safety-critical loads, an independent external safety measure is required. This build features a PT tapered port thread, a sturdy M27x2 rod thread that handles high side loads, and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Given the 600 mm stroke, an external guide rail is strongly recommended to support the rod and prevent binding.
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 BSAI125X600S FAQ
The 8600 N static holding force is the capacity of the clamp mechanism to hold the rod in place at any stroke position. This is separate from the cylinder thrust, which is 6136 N at 0.5 MPa. You must size the holding force against the static load weight, not the thrust.
The clamp is spring-applied and air-released via a dedicated G1/8 port. It only locks after the rod has stopped moving and cannot brake a moving load. To unlock it safely, the air pressures on both sides of the piston must be balanced to prevent the rod from jumping, and human-safety loads require an independent backup measure.
Related AirTAC Lock & Standard Cylinders
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