Airtac BSAI Locking Clamp Cylinder BSAI50X350S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X350S is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 350mm 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
- Stroke350 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 BSAI50X350S
The AirTAC BSAI50X350-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the 20mm carbon steel rod at any position along its 350mm travel, providing a static holding force of 1400 N. The integrated -S magnet supports precise position sensing via CMSE reed and DMSE electronic switches. Operating strictly within a 0.15-0.7 MPa range, it delivers 982 N of thrust at 0.5 MPa.
It is critical to distinguish this 1400 N holding force from the cylinder's thrust, as the clamp must be sized against the static load, not the push force. The clamp engages only after the piston stops; it cannot brake a moving rod. Furthermore, the variable air cushion at the stroke ends only decelerates the piston, while the actual load holding is entirely managed by the clamp mechanism. A dedicated G1/8 enclasp port supplies the 0.15-0.7 MPa unlock pressure, requiring balanced cylinder pressures to prevent the rod from jumping upon release.
Airtac BSAI Locking Clamp Cylinder BSAI50X350S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X350S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 350 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 BSAI50X350S Is Used
Vertical Axis Hold
Freezes a lifted workpiece at any intermediate height, preventing a sudden drop during a pneumatic pressure loss.
Machining Position Lock
Secures the part rigidly at a custom stroke location for milling or inspection without relying on end-stop cushions.
Mid-Stroke Safety Stop
Provides a reliable 1400 N static hold anywhere in the 350mm travel to safely pause an automated process.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X350S the Right Clamp-Lock?
Step down to a 40mm bore if your load requires less than 628 N thrust at 0.5 MPa and 900 N of holding capacity, or step up to a 63mm bore for 1559 N thrust and 2200 N holding force. Choose this BSAI over a SAIL model when you need to freeze the load mid-stroke rather than just at the end positions. If position holding is entirely unnecessary, a plain SAI cylinder suffices.
This 350mm stroke requires an external guide to prevent rod sag and side-load damage, despite the robust 20mm rod and M16x1.5 thread. The clamp locks only after the cylinder has stopped, so an additional independent safety measure is required for human-safety applications. Replacement requires a single-rod, 50mm bore, 350mm stroke, PT ported cylinder with the -S magnet, matching the Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2 mounting sets.
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 BSAI50X350S FAQ
It provides a static holding force of 1400 N. The clamp is spring-applied and air-released, meaning it engages automatically when air is removed, holding the rod bidirectionally at any position.
No, the clamp only locks after the cylinder has stopped moving and cannot act as a dynamic brake. Additionally, it must be unlocked with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly.
Related AirTAC Lock & Standard Cylinders
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