Airtac BSAI Locking Clamp Cylinder BSAI50X400S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X400S 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 BSAI50X400S
The AirTAC BSAI50X400-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 400mm travel, delivering a static holding force of 1400 N. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches. Operating at 0.15-0.7 MPa, it generates 982 N of push thrust at 0.5 MPa. A key distinction exists between holding force and thrust: the 1400 N clamp rating resists external static loads, whereas the 982 N thrust dictates the cylinder's motive power. Buyers must size the holding capacity against the load weight, not the thrust. The enclasp mechanism uses a separate G1/8 unlock port and requires balanced air pressure on both sides of the piston to release safely. Furthermore, the variable air cushion at stroke ends only decelerates the piston; the mechanical clamp is the actual load-holding device.
This 50mm bore model utilizes a 1/4 cylinder port and an M16x1.5 rod thread. Because the 400mm stroke is substantial, the 20mm rod diameter provides robust resistance to bending, though an external guide is recommended for heavy offset loads. The clamp locks bidirectionally but only engages after the rod has completely stopped, meaning it cannot brake a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI50X400S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X400S |
|---|---|
| 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 BSAI50X400S Is Used
Vertical Axis Hold
Prevents gravity-driven drops on vertical strokes by clamping the rod securely at any 400mm travel point during an air-pressure loss.
Machining Position Lock
Freezes the rod at a precise intermediate coordinate for machining or inspection, ensuring the workpiece remains entirely rigid.
Emergency Stop Safety
Holds the load immediately after the cylinder stops moving during an unexpected power outage, though human-safety systems need independent backups.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X400S the Right Clamp-Lock?
Step down to a 40mm bore if your application requires less motive force (628 N thrust at 0.5 MPa) and can tolerate its 900 N holding limit. Step up to a 63mm bore for 1559 N thrust and a 2200 N holding capacity if the load exceeds the 50mm clamp rating. Choose this BSAI model over a SAIL cylinder when you need to secure the load at any intermediate point, rather than only at stroke extremes. A plain SAI cylinder suffices if no mid-stroke holding is needed. Remember that the clamp locks only after the rod stops and cannot act as a dynamic brake; safety-critical applications require an independent external safety measure. To release the lock safely, balance the air pressure to prevent abrupt rod movement. This single-rod configuration supports Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It features PT tapered ports and an -S magnet for CMSE/DMSE 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 BSAI50X400S FAQ
The spring-applied clamp provides a static holding force of 1400 N. It locks bidirectionally at any position along the stroke, but only engages after the rod has stopped moving.
The lock is released via a separate G1/8 enclasp port. You must balance the air pressure on both sides of the piston before unlocking; otherwise, the rod can move abruptly. It cannot brake a moving rod.
Related AirTAC Lock & Standard Cylinders
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