Airtac BSAI Locking Clamp Cylinder BSAI125X800S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X800S is a genuine double-acting ISO 15552 cylinder with a Ø125mm 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 8600 N.
- BoreØ125 mm
- Stroke800 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X800S
The AirTAC BSAI125X800-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released enclasp mechanism that clamps the M27x2 piston rod. Unlike standard cylinders, this unit locks securely at ANY position along its 800 mm travel, providing a static holding force of 8600 N. It delivers a practical maximum thrust of 8590 N at 0.7 MPa. Buyers must distinguish between holding force and thrust: the 8600 N clamp rating resists external static loads, whereas the 8590 N thrust dictates the cylinder's capacity to move that load in the first place.
This model features a 32 mm carbon steel rod and PT tapered thread ports, operating at 0.15-0.7 MPa. The clamp utilizes a separate G1/8 enclasp port and requires balanced air pressure to unlock safely, preventing abrupt rod jumps. The integrated variable air cushion decelerates the piston near stroke ends but does not hold the load; only the mechanical clamp performs that function. Equipped with a magnet (-S), it supports AirTAC CMSE reed and DMSE solid-state sensors for precise position feedback.
Airtac BSAI Locking Clamp Cylinder BSAI125X800S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X800S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 BSAI125X800S Is Used
Vertical Load Holding
Freezes heavy vertical stages at any height along the 800 mm travel, relying on the 8600 N static clamp force rather than live air pressure.
Power Loss Safety
Spring-applied enclasp engages instantly upon air loss, securing the 125 mm bore load exactly where it stopped without drifting down.
Machining Position Hold
Locks the rod rigidly mid-stroke for machining or inspection processes, functioning separately from the variable air cushions.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X800S the Right Clamp-Lock?
Choose this 125 mm bore model when an application demands extreme mid-stroke positioning and heavy load holding that smaller bores cannot manage. If 8600 N of holding force is excessive, stepping down to a 100 mm bore provides 5500 N of clamp force and 3927 N of thrust at 0.5 MPa. This BSAI variant outperforms a SAIL cylinder when the load must be frozen mid-stroke rather than only at the end of travel. For simple transfer tasks without position holding, a plain SAI cylinder suffices. Because the stroke is 800 mm, the long unsupported rod requires an external guide to prevent side-load damage, despite the robust 32 mm rod diameter.
As a replacement match, verify single-rod configuration, 125 mm bore, 800 mm stroke, PT port threads, and the -S magnet. The BSAI accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Remember that the clamp locks only after the cylinder has completely stopped; it cannot brake a moving rod. Safety-critical applications must include an independent external safety measure, and operators must ensure balanced piston pressures before unlocking to prevent sudden movements.
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 BSAI125X800S FAQ
The built-in enclasp mechanism provides a static holding force of 8600 N. It is bidirectional, locking the rod securely at any position along the 800 mm stroke after the cylinder stops moving.
The clamp is spring-applied and air-released via a dedicated G1/8 port. It only locks after the rod stops and cannot brake a moving load. To unlock safely, the air pressures on both sides of the piston must be balanced to prevent abrupt rod movement, and human-safety loads require an independent external safety measure.
Related AirTAC Lock & Standard Cylinders
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