Airtac BSAI Locking Clamp Cylinder BSAI50X400
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X400 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 400mm 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
- Stroke400 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 BSAI50X400
The AirTAC BSAI50X400 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It delivers a practical push thrust of 1374 N at 0.7 MPa, while the separate clamp mechanism provides a static holding force of 1400 N. It is vital to distinguish holding force from cylinder thrust: the clamp resists an external static load independently of the pneumatic thrust, so you must size the 1400 N rating against your load, not the thrust. The clamp locks the 20 mm rod at any position bidirectionally, but only after the rod has stopped; it cannot brake a moving load.
This 400 mm stroke model uses a 1/4 inch PT tapered cylinder port plus a separate G1/8 enclasp port to release the lock at 0.15-0.7 MPa. The variable air cushion at stroke ends only decelerates the piston and is never the holding device. Because the stroke is 400 mm, the extended rod needs external guidance to prevent excessive side-loading. Sensors are not included, but the barrel features a groove for adding CMSE reed or DMSE solid-state switches if needed.
Airtac BSAI Locking Clamp Cylinder BSAI50X400 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X400 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 400 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 BSAI50X400 Is Used
Vertical Axis Hold
Maintains a 1400 N vertical load securely at any intermediate height along the 400 mm stroke without relying on continuous air pressure.
Power Loss Safety
Spring-applied clamp engages automatically upon air loss, freezing the rod in place to prevent uncontrolled drops during an outage.
Machining Position Lock
Secures a workpiece at a precise intermediate stroke position for machining or inspection, releasing only when balanced pressure is applied.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X400 the Right Clamp-Lock?
Select this 50 mm bore model for mid-range vertical holding tasks; if you need more force, the 63 mm bore offers 1559 N thrust at 0.5 MPa and a 2200 N hold, while the smaller 40 mm bore provides 628 N thrust and a 900 N hold. Choose this BSAI over a SAIL cylinder when you must lock at any point in the 400 mm travel, not just at the end. If you only need standard movement without intermediate holding, a plain SAI cylinder suffices. Always unlock the clamp with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly.
As a replacement, match the single-rod configuration, 50 mm bore, 400 mm stroke, PT port threads, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). The M16x1.5 rod thread handles high side-load stress well, but an external guide is still recommended for this 400 mm stroke.
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 BSAI50X400 FAQ
It uses a spring-applied, air-released mechanism to grip the 20 mm rod at any position with a 1400 N static holding force. The lock engages bidirectionally after the cylinder stops, but it cannot brake a moving rod.
No, the clamp must be unlocked only when the air pressures on both sides of the piston are balanced and the cylinder has stopped. Releasing it with unbalanced pressure can cause the rod to jump abruptly.
Related AirTAC Lock & Standard Cylinders
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