Airtac BSAI Locking Clamp Cylinder BSAI50X300S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X300S is a genuine double-acting ISO 15552 cylinder with a Ø50mm 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 1400 N.
- BoreØ50 mm
- Stroke300 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM16×1.5
- 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 BSAI50X300S
The AirTAC BSAI50X300-S is a double-acting ISO 15552 profile cylinder equipped with a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the carbon steel piston rod to hold a static load securely at any position along its 300 mm travel. This specific bore provides 982 N of thrust at 0.5 MPa, while the independent clamp delivers a static holding force of 1400 N. You must size the holding force against your static load, as the clamp holding capacity is a completely separate quantity from the cylinder thrust.
The clamp operates via a third G1/8 enclasp port, requiring 0.15-0.7 MPa to release the grip. Remember that the variable air cushion only decelerates the piston near stroke ends; it is the mechanical clamp that actually holds the load. This unit includes a magnet (-S) for precise position sensing with AirTAC CMSE reed or DMSE electronic solid-state switches. Because the stroke is 300 mm, the 20 mm rod and M16x1.5 thread provide good side-load capacity, but an external guide is still recommended for unsupported lengths.
Airtac BSAI Locking Clamp Cylinder BSAI50X300S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X300S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 300 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 1400 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 1000 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 (Ø50 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa (max) | 1374 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (1400 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI50X300S Is Used
Vertical Axis Holding
Secures a 50 mm bore vertical lift at any intermediate height during power loss, preventing gravity-driven drops with 1400 N of static holding force.
Machining Position Hold
Locks the carbon steel rod rigidly in place mid-stroke to resist machining vibrations while a workpiece is drilled or milled.
Emergency Stop Safety
Holds a stopped load anywhere in the 300 mm travel during an emergency stop, though an independent safety measure is required for human safety.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X300S the Right Clamp-Lock?
Choose this 50 mm bore when you need mid-range thrust (982 N push at 0.5 MPa) combined with 1400 N of holding power. Step down to a 40 mm bore if your load requires only 528 N of thrust and 900 N of holding force, or step up to a 63 mm bore for 1402 N of thrust and 2200 N of holding force. Select this BSAI model over a SAIL cylinder when you need to lock at any point in the stroke rather than just at the end positions. If no intermediate holding is required, a plain SAI cylinder suffices.
For safe operation, note that the clamp locks only after the rod has stopped; it cannot brake a moving load. It must be unlocked with balanced air pressures on both sides of the piston, or the rod may jump abruptly. Safety-critical applications require an additional independent safety measure. This replacement uses a single rod, PT tapered ports (1/4 cylinder port, G1/8 enclasp port), and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2 mountings.
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 BSAI50X300S FAQ
The clamp-lock provides a static holding force of 1400 N. It is bidirectional and locks the rod at any position along the 300 mm stroke, but only after the piston has stopped moving.
The clamp is spring-applied and air-released via a third G1/8 port. You must balance the air pressure on both sides of the piston before unlocking, otherwise the rod can move abruptly. It cannot brake a moving rod.
Related AirTAC Lock & Standard Cylinders
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