Airtac BSAI Locking Clamp Cylinder BSAI50X300
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X300 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 300mm 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
- Stroke300 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 BSAI50X300
The AirTAC BSAI50X300 is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock that secures the load at any position along its 300 mm stroke. A spring-applied, air-released mechanism grips the 20 mm carbon steel rod, delivering a static holding force of 1400 N. This holding capacity is entirely separate from the cylinder's 982 N push thrust at 0.5 MPa; you must size the clamp against the static load weight, not the pneumatic force. Operating pressure is 0.15-0.7 MPa.
This enclasp unit is bidirectional, locking securely whether the rod was extending or retracting. It uses a third G1/8 unlock port—separate from the 1/4 cylinder ports—requiring 0.15-0.7 MPa to release the grip. Note that the variable air cushion at stroke ends only decelerates the piston; the clamp is what actually holds the load. The mechanism locks only after the rod has stopped, so it cannot brake a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI50X300 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X300 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 300 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 BSAI50X300 Is Used
Vertical Load Holding
Secures elevated workpieces at any point in the 300 mm travel, preventing gravity-driven drops during air pressure loss.
Emergency Stop Safety
Holds a stopped load mid-stroke safely, though an independent safety measure is required for human-safe guarding.
Machining Position Hold
Locks the 20 mm rod rigidly for intermediate inspection or light machining without relying on continuous pneumatic pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X300 the Right Clamp-Lock?
Choose this 50 mm bore when an application requires intermediate position holding that a SAIL stroke-end lock cannot provide, delivering 982 N thrust alongside the 1400 N clamp. If less force is needed, the 40 mm bore offers 628 N thrust and 900 N holding force; for heavier loads, the 63 mm bore provides 1559 N thrust and 2200 N holding force. If no mid-stroke locking is required, a plain SAI cylinder suffices.
For safe operation, balance the air pressure on both sides of the piston before unlocking, or the rod may jump abruptly. Because this is a 300 mm stroke, an external guide is recommended to prevent side-loading on the 20 mm rod. This single-rod model uses PT ports and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It ships without a magnet; add an -S suffix for CMSE reed or DMSE electronic sensors.
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 BSAI50X300 FAQ
It uses a spring-applied, air-released mechanism to grip 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 first balance the pressure on both sides of the piston. If pressures are unbalanced, the rod will jump abruptly upon release.
Related AirTAC Lock & Standard Cylinders
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