Airtac BSAI Locking Clamp Cylinder BSAI63X125
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI63X125 is a genuine double-acting ISO 15552 cylinder with a Ø63mm 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 2200 N.
- BoreØ63 mm
- Stroke125 mm
- Cylinder portG3/8
- 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 BSAI63X125
The AirTAC BSAI63X125 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It delivers 1559 N of thrust at 0.5 MPa and firmly grips the 20 mm piston rod at any position along its 125 mm travel, providing a static holding force of 2200 N. Unlike standard cylinders, this enclasp mechanism retains the load without requiring live air pressure. It is critical to distinguish this holding force from thrust: the 2200 N rating dictates how much static load the clamp resists, whereas the 1559 N thrust drives the motion.
The integrated variable air cushion only decelerates the piston near the stroke ends to reduce impact; the clamp itself is what secures the load. Operation requires a 0.15-0.7 MPa pressure range and a separate G1/8 enclasp port to release the lock. Because the clamp engages only after the rod has completely stopped, it cannot function as a dynamic brake. Furthermore, pressure must be balanced across the piston before unlocking to prevent the rod from jumping abruptly.
Airtac BSAI Locking Clamp Cylinder BSAI63X125 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI63X125 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø63 mm |
| Stroke | 125 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G3/8 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 2200 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 (Ø63 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa (max) | 2182 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (2200 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI63X125 Is Used
Vertical Axis Holding
Prevents gravity-driven drops on vertical actuators by clamping the rod securely at any intermediate position during an air loss event.
Machining Position Lock
Freezes the workpiece at a precise mid-stroke location for machining or inspection, ensuring the rod does not shift under lateral cutting forces.
Mid-Stroke Safety Stop
Provides emergency load holding anywhere in the 125 mm travel, though independent safety measures are required if human safety is at risk.
Is the Airtac BSAI Locking Clamp Cylinder BSAI63X125 the Right Clamp-Lock?
Choose this 63 mm bore when a load needs to be held mid-stroke rather than just at the end. If 1559 N of thrust or 2200 N of holding capacity is insufficient, step up to the 80 mm bore, which provides 2513 N of thrust and 3600 N of holding force. Conversely, lighter duties can use the 50 mm bore (982 N thrust, 1400 N hold). This model is preferred over a SAIL cylinder when you need a lock anywhere in the travel rather than only at the stroke end. If no intermediate holding is required, a plain SAI cylinder suffices.
For replacements, verify the single-rod configuration, 125 mm stroke, and PT-threaded 3/8 cylinder ports. The 20 mm rod with an M16x1.5 thread offers good side-load resistance, but external guidance is recommended for unsupported loads. The mounting interface accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 brackets. As this unit lacks the -S magnet option, position sensing via AirTAC CMSE or DMSE switches is not supported.
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 BSAI63X125 FAQ
The clamp-lock provides a static holding force of 2200 N. It is spring-applied and grips the rod bidirectionally at any position, but it only engages after the cylinder has stopped moving.
The lock is released by applying air pressure to the dedicated G1/8 enclasp port. To prevent the rod from jumping, the air pressures on both sides of the piston must be balanced before unlocking, ensuring the cylinder has stopped completely.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac BSAI Locking Clamp Cylinder BSAI63X125
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.