Airtac BSAI Locking Clamp Cylinder BSAI40X75
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X75 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 75mm 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
- Stroke75 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 BSAI40X75
The AirTAC BSAI40X75 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released enclasp mechanism. A defining characteristic of this series is its ability to lock the carbon steel piston rod at ANY position along the 75mm stroke, providing a documented static holding force of 900 N. Operating within a 0.15-0.7 MPa range, it delivers 628 N of thrust at 0.5 MPa. Remember that holding force and cylinder thrust are two distinct quantities; you must size the 900 N clamp capacity against your static load, not the 628 N pneumatic thrust.
This clamp locks bidirectionally, meaning it secures the rod whether it was extending or retracting. It requires a third G1/8 enclasp port to release the grip, operating independently from the primary 1/4 cylinder ports. 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. The clamp locks only after the cylinder has stopped and cannot brake a moving rod.
Airtac BSAI Locking Clamp Cylinder BSAI40X75 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X75 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 BSAI40X75 Is Used
Vertical Axis Load Holding
Prevents a 40mm bore vertical payload from dropping by clamping the rod at any point in the 75mm travel during a pneumatic pressure loss.
Machining Position Lock
Secures a workpiece at a precise intermediate stroke position for machining or inspection, holding the load with 900 N of static force without relying on air pressure.
Mid-Stroke Safety Hold
Provides an emergency stop and hold capability anywhere along the stroke, ensuring the cylinder remains stationary even if the air supply is removed.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X75 the Right Clamp-Lock?
Choose this 40mm bore when an application requires mid-stroke holding that a plain SAI cannot provide, or when a SAIL stroke-end-only lock is insufficient. If you need less holding capacity, the 32mm bore offers 600 N holding force and 402 N thrust at 0.5 MPa; stepping up to the 50mm bore provides 1400 N holding force and 982 N thrust. Because the stroke is 75mm, side-load stress is minimal, but the 16mm rod with an M12x1.25 thread still handles lateral forces well.
When replacing a unit, match the single-rod configuration, 40mm bore, 75mm stroke, and PT tapered port threads. The correct mounting set includes Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Since no magnet is specified, position sensing requires adding an -S option for CMSE reed or DMSE electronic sensors. Always unlock the clamp with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly, and add independent safety measures if human safety depends on the hold.
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 BSAI40X75 FAQ
The BSAI40X75 provides a static holding force of 900 N. The clamp is spring-applied and air-released, meaning it engages automatically to hold the rod at any stroke position, and requires 0.15-0.7 MPa of air pressure at the G1/8 enclasp port to unlock.
No, the clamp locks only after the cylinder has stopped and cannot brake a moving rod. Additionally, it must be unlocked only when the air pressures on both sides of the piston are balanced, otherwise the rod can move abruptly. If human safety depends on the hold, an additional independent safety measure is required.
Related AirTAC Lock & Standard Cylinders
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