Airtac BSAI Locking Clamp Cylinder BSAI50X75
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X75 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 75mm 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
- Stroke75 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 BSAI50X75
The AirTAC BSAI50X75 is a double-acting ISO 15552 profile cylinder with a 50 mm bore and 75 mm stroke, engineered with a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the 20 mm piston rod to hold the load securely at ANY position along the travel. The enclasp provides a static holding force of 1400 N, while the cylinder itself delivers 982 N of push thrust at 0.5 MPa (1374 N at 0.7 MPa). You must size the holding force against the static load separately from the cylinder thrust, as these are two distinct quantities.
This clamp operates bidirectionally, locking whether the rod was extending or retracting. It uses a third G1/8 enclasp port—separate from the 1/4 cylinder ports—to release the lock at 0.15-0.7 MPa. Remember that the variable air cushion only decelerates the piston near the stroke end; the clamp is what actually holds the load. The mechanism locks only after the cylinder has stopped, so it cannot brake a moving rod.
Airtac BSAI Locking Clamp Cylinder BSAI50X75 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X75 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 75 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 BSAI50X75 Is Used
Vertical Axis Holding
Secures a 50 mm bore lift at any intermediate height with 1400 N of holding force, preventing drops during an air pressure loss without relying on live pressure.
Mid-Stroke Machining
Clamps the rod securely at a specific intermediate point for machining or inspection, ensuring the workpiece remains completely stationary.
Emergency Stop Hold
Locks the load exactly where it stopped after an E-stop, providing reliable position holding until the system is safely reset and balanced.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X75 the Right Clamp-Lock?
Choose this 50 mm bore when an application requires 982 N of thrust at 0.5 MPa combined with a 1400 N static hold. Step down to a 40 mm bore for lighter loads (628 N thrust, 900 N hold), or up to a 63 mm bore for heavier demands (1559 N thrust, 2200 N hold). Select this BSAI model over a SAIL cylinder when you need to lock at any mid-stroke position rather than just at the stroke end. If position holding is unnecessary, a plain SAI cylinder suffices.
For safe operation, unlock the clamp only when air pressures on both sides of the piston are balanced, or the rod may jump abruptly. Safety-critical loads require an additional independent safety measure. This configuration features a carbon steel rod with PT tapered threads. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Sensors are not included; adding an -S magnet enables CMSE reed or DMSE electronic switches.
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 BSAI50X75 FAQ
It uses a spring-applied, air-released mechanism that clamps the rod at any stroke position with a 1400 N static holding force. The lock engages only after the cylinder has stopped moving and cannot be used to brake a moving rod.
You must apply air to the G1/8 enclasp port, but only after balancing the air pressures on both sides of the piston. If pressures are unbalanced when unlocked, the rod can move abruptly, so an independent safety measure is required for human safety.
Related AirTAC Lock & Standard Cylinders
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