Airtac BSAI Locking Clamp Cylinder BSAI40X50S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X50S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 50mm 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
- Stroke50 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 BSAI40X50S
The AirTAC BSAI40X50-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It delivers 628N of thrust at 0.5MPa and firmly holds the load at any position along its 50mm stroke with a 900N static holding force. Buyers must size the holding force against the static load, as the clamp holding capacity is a distinct quantity from the cylinder's thrust. A carbon steel piston rod and PT tapered ports come standard.
This unit includes a -S magnet for CMSE reed and DMSE electronic sensors. The lock engages only after the rod stops, meaning it cannot brake a moving piston. To prevent abrupt movement upon release, the clamp requires a balanced air pressure across the piston via its dedicated G1/8 enclasp port. The variable air cushion at stroke ends only decelerates the piston; the clamp mechanism is what actually secures the load.
Airtac BSAI Locking Clamp Cylinder BSAI40X50S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X50S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 BSAI40X50S Is Used
Vertical Axis Hold
Secures a 40mm bore vertical lift at any midpoint travel position, preventing gravity drops during air pressure loss.
Power Loss Safety
Spring-applied clamp immediately locks the rod in place when electrical or pneumatic power is cut, halting workpiece descent.
Machining Position Lock
Holds a workpiece steady at a custom stroke length for intermediate machining or inspection steps without end-stop reliance.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X50S the Right Clamp-Lock?
Select this 40mm bore when a 32mm bore (402N thrust, 600N hold) lacks sufficient holding capacity, but a 50mm bore (982N thrust, 1400N hold) is oversized. Choose this BSAI model over a SAIL cylinder when you need the rod to lock anywhere along the travel rather than just at the stroke end. If position holding is unnecessary, a plain SAI cylinder suffices. For safe operation, remember the lock engages after the cylinder stops and requires balanced pressure to unlock safely; safety-critical applications need an independent external measure. Replacement requires a single rod, 40mm bore, 50mm stroke, PT ports, and a mounting set of Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2. The M12x1.25 rod thread provides robust side-load resistance.
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 BSAI40X50S FAQ
The BSAI40X50-S provides a static holding force of 900N. The spring-applied clamp locks the rod at any position along the 50mm stroke, holding the load securely without requiring live air pressure.
The clamp must be released by applying 0.15-0.7 MPa to the G1/8 enclasp port only after the air pressures on both sides of the piston are balanced. If pressures are unbalanced, the rod can jump abruptly upon unlocking. The lock engages after the rod stops and cannot brake a moving load.
Related AirTAC Lock & Standard Cylinders
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