Airtac BSAI Locking Clamp Cylinder BSAI125X160S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X160S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 160mm 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
- Stroke160 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X160S
The AirTAC BSAI125X160-S is a double-acting ISO 15552 profile cylinder featuring a single carbon steel rod and an integrated spring-applied, air-released clamp-lock. It delivers a massive 8600 N static holding force, gripping the rod securely at any position along its 160 mm stroke. This bidirectional enclasp mechanism operates via a dedicated G1/8 unlock port, requiring 0.15-0.7 MPa to release the grip. Equipped with a magnet (-S), it pairs directly with AirTAC CMSE reed and DMSE solid-state sensors for precise position tracking.
It is crucial to distinguish this 8600 N holding force from the cylinder's thrust, which reaches 8590 N at 0.7 MPa (6136 N push at 0.5 MPa); the clamp secures the static load, while thrust moves it. Furthermore, the variable air cushion only decelerates the piston near the stroke ends—it does not hold the load. The clamp strictly engages after the rod has stopped, meaning it cannot brake a moving load. Safety-critical applications must include an independent external safety measure, and unlocking requires balanced air pressures on both sides of the piston to prevent abrupt rod jumps.
Airtac BSAI Locking Clamp Cylinder BSAI125X160S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X160S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 160 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 BSAI125X160S Is Used
Vertical Load Holding
Secures heavy elevated platforms or vertical machining heads at any point in the 160 mm travel, preventing gravity-driven drops during air loss.
Power Failure Safety
The spring-applied clamp instantly engages when air pressure drops, locking the 125 mm bore rod exactly where it stopped to protect operators and tooling.
Machining Position Hold
Clamps a workpiece or fixture rigidly in place with 8600 N of holding force to resist cutting vibrations, independent of the cylinder's thrust.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X160S the Right Clamp-Lock?
Select this 125 mm bore model when a heavy vertical or suspended load demands mid-stroke security that a plain SAI cannot provide, or when a SAIL stroke-end lock is insufficient. If 8600 N holding capacity exceeds your static load, stepping down to the 100 mm bore offers 5500 N holding force and 3927 N thrust at 0.5 MPa, optimizing air consumption. Choose BSAI over SAIL specifically when you need the load held at arbitrary positions rather than just at the stroke extremes. The robust M27x2 rod thread handles substantial side loads, though any stroke at or above 300 mm still requires an external guide to prevent rod deflection.
For a drop-in replacement, match the single-rod configuration, 125 mm bore, 160 mm stroke, and PT tapered port threads. This single-rod variant accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The integrated -S magnet works seamlessly with CMSE and DMSE switches. Always ensure the system controller balances pressures before sending the unlock signal to the G1/8 enclasp port, as releasing the clamp on an unbalanced cylinder creates a sudden rod shift hazard.
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 BSAI125X160S FAQ
The BSAI125X160-S provides a static holding force of 8600 N. Its spring-applied clamp locks the rod bidirectionally at any position along the 160 mm stroke, unlike SAIL cylinders which only hold at stroke ends.
The clamp engages after the rod stops and cannot brake a moving load. To unlock it safely via the G1/8 port, air pressures on both sides of the piston must be balanced; otherwise, the rod can jump abruptly. Safety-critical loads require an independent backup measure.
Related AirTAC Lock & Standard Cylinders
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