Airtac BSAI Locking Clamp Cylinder BSAI50X125S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X125S is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 125mm 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 1400 N.
- BoreØ50 mm
- Stroke125 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM16×1.5
- 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 BSAI50X125S
The AirTAC BSAI50X125-S is a double-acting ISO 15552 profile cylinder with a built-in clamp-lock, featuring a carbon steel single rod and a PT tapered port thread. A spring-applied, air-released mechanism clamps the rod to secure the load at any position along its 125 mm travel. The integrated magnet supports CMSE reed and DMSE solid-state sensors for precise position detection. Delivering a practical thrust of 982 N at 0.5 MPa, it provides a static holding force of 1400 N. Remember that holding force and thrust are distinct quantities; you must size the clamp holding force against your static load, not the cylinder thrust.
The lock engages bidirectionally after the piston stops, meaning it cannot brake a moving rod. A separate G1/8 enclasp port releases the clamp when air pressures on both sides of the piston are balanced. The variable air cushion only decelerates the piston near stroke end; the clamp itself is what holds the load. If human safety depends on the hold, an additional independent safety measure is required.
Airtac BSAI Locking Clamp Cylinder BSAI50X125S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X125S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 1400 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 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 (Ø50 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa (max) | 1374 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (1400 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI50X125S Is Used
Vertical Axis Holding
Secures elevated loads at any point on a vertical stroke, preventing drops during air pressure loss.
Machining Position Lock
Clamps the rod rigidly mid-stroke to hold a workpiece steady for drilling or inspection.
Emergency Power-Loss Hold
The spring-applied clamp engages instantly upon air loss to freeze the piston wherever it stopped.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X125S the Right Clamp-Lock?
Choose this 50 mm bore model when an application requires intermediate position holding that a SAIL stroke-end-only lock cannot provide. Stepping down to a 40 mm bore drops the thrust to 628 N and the holding force to 900 N, while stepping up to a 63 mm bore yields 1559 N thrust and 2200 N holding force. A plain SAI cylinder suffices if no mid-stroke clamping is needed. The 20 mm rod and M16x1.5 thread offer robust side-load capacity for this 125 mm stroke. Ensure safe operation by unlocking only after the cylinder has stopped and pressures are balanced to prevent abrupt rod movement. Replacement matches require a single rod, 50 mm bore, 125 mm stroke, PT ports, and the -S magnet. Compatible mounts include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2.
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 BSAI50X125S FAQ
The clamp-lock provides a static holding force of 1400 N. It locks the rod bidirectionally at any position along the stroke after the cylinder has stopped.
The clamp is released via a separate G1/8 enclasp port, but only when air pressures on both sides of the piston are balanced. Releasing it while unbalanced causes the rod to jump, so an independent safety measure is required for human-safety loads.
Related AirTAC Lock & Standard Cylinders
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