Airtac BSAI Locking Clamp Cylinder BSAI125X450S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X450S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 450mm 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
- Stroke450 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
- 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 BSAI125X450S
The AirTAC BSAI125X450-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 450 mm travel, delivering a robust static holding force of 8600 N. Because it is a single-rod design, it generates 6136 N of thrust at 0.5 MPa (pushing) and 8590 N at the maximum practical operating pressure of 0.7 MPa. Keep in mind that holding force and thrust are separate values; you must size the 8600 N clamp capacity against your static load, not the cylinder's thrust.
This unit includes a -S magnet for CMSE reed and DMSE electronic sensors, fitting into the profile barrel's sensor groove. The clamp mechanism relies on a third G1/8 enclasp port, separate from the 1/2 cylinder ports, and requires 0.15-0.7 MPa to release. Remember that the variable air cushion only decelerates the piston near stroke ends; the clamp is what truly holds the load. Furthermore, the lock engages only after the rod stops—it cannot brake a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI125X450S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X450S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 BSAI125X450S Is Used
Vertical Axis Load Holding
Secures heavy vertical loads at any point along the 450 mm stroke, preventing gravity-driven drops during power loss.
Machining Position Lock
Holds a heavy workpiece perfectly still at a mid-stroke position for milling or drilling operations without relying on fluid pressure.
Emergency Safety Stop
Acts as a fail-safe gripper that clamps the carbon steel rod instantly when air pressure drops, locking the load until pressure is restored.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X450S the Right Clamp-Lock?
Select this 125 mm bore model when an application demands exceptionally high mid-stroke holding capacity (8600 N) that a smaller bore cannot provide. If you need less force, stepping down to the 100 mm bore offers 5500 N of holding force and 3927 N push thrust at 0.5 MPa. Choose this BSAI clamp-lock over a SAIL cylinder when you must secure the load anywhere in the 450 mm stroke rather than only at the end positions. If mid-stroke locking is unnecessary, a plain SAI cylinder suffices.
For safe operation, the clamp locks only after the cylinder has stopped, and it must be unlocked with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly. Safety-critical applications require an additional independent safety measure. This configuration features PT tapered ports, a 32 mm rod with an M27x2 thread, and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Since the 450 mm stroke is relatively long, use an external guide to support the rod and prevent excessive side loading.
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 BSAI125X450S FAQ
The clamp-lock provides a static holding force of 8600 N. It engages via a spring-applied mechanism at any position along the 450 mm stroke, holding the load securely without requiring continuous air pressure.
No, the clamp locks only after the rod has stopped; it cannot brake a moving load. Additionally, it must be unlocked with balanced air pressures on both sides of the piston to prevent the rod from jumping. Safety-critical loads require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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