Airtac BSAI Locking Clamp Cylinder BSAI40X125S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X125S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 125mm 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
- Stroke125 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 BSAI40X125S
The AirTAC BSAI40X125-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the load at any position along its 125mm travel, delivering a static holding force of 900 N. This holding capacity is entirely separate from the cylinder's kinetic thrust, which is 628 N push at 0.5 MPa, meaning you must size the clamp against the static load rather than the bore's push force. A -S magnet enables position sensing via CMSE reed or DMSE solid-state switches.
The clamp mechanism relies on a third G1/8 enclasp port to release the rod, operating effectively within a 0.15-0.7 MPa pressure range. It is crucial to understand that the variable air cushion only decelerates the piston near stroke end; the mechanical clamp is what actually holds the load. Furthermore, the lock engages only after the rod has completely stopped, serving as a position hold rather than a dynamic braking device.
Airtac BSAI Locking Clamp Cylinder BSAI40X125S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X125S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 BSAI40X125S Is Used
Vertical Axis Drop Prevention
Holds an elevated carriage securely at any point in the stroke, preventing gravity-driven falls during a sudden compressed air loss.
Machining Position Hold
Locks the workpiece in a precise intermediate location for a secondary operation, ensuring the part does not shift under cutting loads.
Power Outage Safety
Maintains the rod safely in place mid-cycle if electrical power to the solenoid valves is unexpectedly interrupted.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X125S the Right Clamp-Lock?
Choose this 40mm bore if your application demands 900 N of static holding power mid-stroke, whereas a smaller 32mm bore offers 600 N hold and 402 N thrust. If the load only needs to be secured at the stroke extremes, a plain SAI or stroke-end SAIL cylinder suffices. However, for drop-prevention on vertical axes anywhere in the travel, the BSAI clamp-lock is required. Always ensure the rod has stopped before locking, and apply balanced pressure to unlock the G1/8 enclasp port to prevent abrupt rod movement.
This single-rod configuration accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It features PT tapered ports and an M12x1.25 rod thread. The 16mm carbon steel rod provides a robust interface for tooling, though external guidance is recommended for side loads. The -S variant supports AirTAC CMSE and 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 BSAI40X125S FAQ
The clamp-lock provides a static holding force of 900 N. It locks the rod bidirectionally at any position along the stroke, but it only engages after the piston has stopped moving.
The lock is spring-applied and air-released via a third G1/8 enclasp port. You must balance the air pressures on both sides of the piston before unlocking, otherwise the rod may jump abruptly. For human-safety critical loads, an independent external safety measure is required.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac BSAI Locking Clamp Cylinder BSAI40X125S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.