Airtac BSAI Locking Clamp Cylinder BSAI40X300S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X300S is a genuine double-acting ISO 15552 cylinder with a Ø40mm 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 900 N.
- BoreØ40 mm
- Stroke300 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 BSAI40X300S
The AirTAC BSAI40X300-S is a double-acting ISO 15552 profile cylinder with a built-in spring-applied, air-released clamp-lock. It provides a static holding force of 900 N at any position along its 300 mm stroke. Delivering 628 N of push thrust at 0.5 MPa, it is crucial to distinguish this holding force from thrust: the 900 N clamp resists an external static load, whereas thrust dictates the cylinder's movement capability.
This unit features a carbon steel rod and a PT tapered port thread. The enclasp mechanism uses a separate G1/8 unlock port, requiring 0.15-0.7 MPa of balanced air pressure to release safely. The integrated variable air cushion only decelerates the piston near stroke ends; the clamp itself is what secures the load. The -S magnet works with AirTAC CMSE reed and DMSE solid-state sensors for position feedback.
Airtac BSAI Locking Clamp Cylinder BSAI40X300S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X300S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 BSAI40X300S Is Used
Vertical Axis Holding
Prevents a 40 mm bore vertical load from dropping under power loss, holding it securely at any point in the 300 mm travel with 900 N of static force.
Machining Position Hold
Locks the carbon steel rod rigidly in place during drilling or milling operations, ensuring the workpiece remains completely stationary without relying on live air pressure.
Mid-Stroke Safety Clamp
Provides a fail-safe hold anywhere along the stroke for ergonomic or automated doors, engaging only after the piston has stopped moving.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X300S the Right Clamp-Lock?
Choose this 40 mm bore when an application demands mid-stroke holding rather than simple end-of-stroke positioning. If you need to step up, the 50 mm bore offers 982 N thrust and 1400 N holding force; stepping down to 32 mm yields 402 N thrust and 600 N holding force. Choose this BSAI over a SAIL model because SAIL only locks at stroke ends, whereas BSAI enclasp locks anywhere. A plain SAI suffices if no holding is needed.
With a 300 mm stroke, the 16 mm carbon steel rod is susceptible to side-loading, so an external guide is recommended. The clamp locks only after the rod stops and cannot brake a moving load; safety-critical applications require an independent measure. Replacement requires a single rod, 40 mm bore, 300 mm stroke, PT ports, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). The -S magnet pairs with CMSE/DMSE switches.
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 BSAI40X300S FAQ
The built-in clamp-lock provides a static holding force of 900 N. It is bidirectional and locks the rod at any position along the 300 mm stroke, but only after the cylinder has stopped moving.
The clamp is spring-applied and air-released via a separate G1/8 port. To prevent the rod from jumping abruptly, you must apply balanced air pressure to both sides of the piston before unlocking. It is not a dynamic brake and cannot stop a moving rod.
Related AirTAC Lock & Standard Cylinders
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