Airtac BSAI Locking Clamp Cylinder BSAI125X500S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X500S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 500mm 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
- Stroke500 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X500S
The AirTAC BSAI125X500-S is a double-acting ISO 15552 profile cylinder featuring an integrated spring-applied, air-released clamp-lock. It delivers a massive 8590 N of thrust at 0.7 MPa and securely holds the load at any position along its 500 mm travel with a static holding force of 8600 N. It is crucial to distinguish holding force from thrust: the 8600 N clamp resists an external static load, whereas thrust is the pneumatic push generated by the 125 mm bore.
This bidirectional enclasp mechanism grips the 32 mm carbon steel rod directly, meaning it locks securely whether the rod was extending or retracting. The clamp utilizes a dedicated G1/8 unlock port and requires a balanced 0.15-0.7 MPa air pressure to release safely. Furthermore, the variable air cushion at both ends only decelerates the piston near stroke limits; it is the mechanical clamp, not the cushion, that maintains the position.
Airtac BSAI Locking Clamp Cylinder BSAI125X500S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X500S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 BSAI125X500S Is Used
Vertical Load Suspension
Holds heavy vertical loads securely at any point in the 500 mm travel, preventing crashes during power loss.
Machining Position Hold
Clamps the 32 mm rod with 8600 N to keep a workpiece perfectly still against machining forces.
Mid-Stroke Safety Lock
Provides a reliable bidirectional mid-stroke safety stop for heavy industrial guarding systems.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X500S the Right Clamp-Lock?
Choose this 125 mm bore when an application demands extreme holding capacity, stepping up from the 80 mm bore which offers 2513 N thrust and 3600 N holding force. The BSAI125X500-S is preferred over a SAIL model because it locks at any intermediate stroke position, whereas SAIL only holds at the stroke end. If you only need movement without position holding, a plain SAI cylinder suffices. Note that the clamp locks only after the rod has completely stopped; it cannot brake a moving load, and unlocking requires balanced piston pressures to prevent the rod from jumping abruptly.
For replacements, match the single-rod configuration, 125 mm bore, 500 mm stroke, and PT tapered ports. The 1/2 inch cylinder port and M27x2 rod thread provide excellent side-load resistance, but at 500 mm stroke, an external guide is recommended for heavy loads. This BSAI variant accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The included -S magnet integrates with AirTAC CMSE reed and DMSE electronic 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 BSAI125X500S FAQ
The integrated clamp-lock provides a static holding force of 8600 N, gripping the rod securely at any position along the 500 mm stroke.
No, the clamp locks only after the rod has stopped moving; it is not a dynamic brake. It must be unlocked with balanced air pressure to prevent sudden rod jumps.
Related AirTAC Lock & Standard Cylinders
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