Airtac BSAI Locking Clamp Cylinder BSAI40X350S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X350S is a genuine double-acting ISO 15552 cylinder with a Ø40mm 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 900 N.
- BoreØ40 mm
- Stroke350 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM12×1.25
- 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 BSAI40X350S
The AirTAC BSAI40X350-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It secures the 16 mm carbon steel rod at any position along its 350 mm travel, providing a static holding force of 900 N. Because it includes a magnet, it supports CMSE reed and DMSE solid-state sensors for precise position detection. The clamp operates via a separate G1/8 enclasp port, requiring 0.15-0.7 MPa to release.
It is crucial to distinguish this 900 N static holding force from the cylinder's dynamic thrust, which is 628 N push or 528 N pull at 0.5 MPa. The clamp's job is to maintain the load without live air pressure, not to drive it. Remember that the variable air cushion only decelerates the piston near the stroke ends; the mechanical clamp is what actually holds the load. This lock engages strictly after the rod has stopped moving, meaning it cannot serve as a braking device for a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI40X350S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X350S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 900 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 800 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 (Ø40 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (900 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI40X350S Is Used
Vertical Axis Hold
Prevents a raised vertical load from dropping by clamping the rod securely at any point in the 350 mm travel, maintaining 900 N of static holding force even under total air pressure loss.
Emergency Power-Loss Hold
Spring-applied clamping engages instantly upon loss of system air, locking the piston exactly where it stopped to protect tooling and workpieces from uncontrolled movements.
Machining Position Hold
Locks the workpiece firmly in a specific intermediate position for a machining or inspection process, ensuring the 16 mm rod remains completely rigid without relying on live air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X350S the Right Clamp-Lock?
Choose this 40 mm bore clamp-lock model when an application requires mid-stroke holding rather than just end-of-stroke stopping. If your load demands greater clamping security, stepping up to the 50 mm bore provides a 1400 N holding force and 982 N thrust at 0.5 MPa. Conversely, lighter duties can use the 32 mm bore with its 600 N hold and 402 N thrust. The BSAI series outperforms a SAIL cylinder because it locks anywhere, whereas SAIL only holds at the stroke end. If no mid-stroke locking is needed, a plain SAI cylinder suffices.
When replacing this unit, match the single-rod configuration, 40 mm bore, 350 mm stroke, and PT tapered ports. The correct mounting set for this single-rod body includes Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Because the 350 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the 16 mm rod. Always unlock the clamp only when cylinder pressures are balanced to prevent the rod from jumping abruptly, and add an independent safety measure for human-safety-critical holds.
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 BSAI40X350S FAQ
The BSAI40X350-S provides a static holding force of 900 N. The clamp is spring-applied and air-released, meaning it locks the rod at any position automatically when air is removed, and requires 0.15-0.7 MPa at the G1/8 enclasp port to unlock.
No, the clamp-lock only engages after the cylinder has come to a complete stop; it cannot brake a moving rod. Additionally, it must be unlocked only when pressures on both sides of the piston are balanced, otherwise the rod can move abruptly. Independent safety measures are required for human-safety applications.
Related AirTAC Lock & Standard Cylinders
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