Airtac BSAI Locking Clamp Cylinder BSAI80X50S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI80X50S is a genuine double-acting ISO 15552 cylinder with a Ø80mm 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 3600 N.
- BoreØ80 mm
- Stroke50 mm
- Cylinder portG3/8
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM20×1.5
About the Airtac BSAI Locking Clamp Cylinder BSAI80X50S
The AirTAC BSAI80X50-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It provides a robust static holding force of 3600 N, gripping the 25 mm carbon steel rod securely at any position along its 50 mm travel. Because it is a single-rod design, the thrust is directional: it delivers 2513 N of push force and 2268 N of pull force at 0.5 MPa. It is crucial to distinguish this holding force from thrust—the 3600 N clamp rating dictates how much static load the brake can sustain, whereas the thrust values only govern the cylinder's movement capability.
This enclasp mechanism operates bidirectionally, maintaining the load whether the rod was extending or retracting. It utilizes a dedicated G1/8 unlock port (separate from the 3/8 cylinder ports) and requires a balanced air pressure of 0.15-0.7 MPa to release safely. The -S suffix indicates an integrated magnet compatible with AirTAC CMSE reed and DMSE solid-state sensors for position feedback. Remember that the variable air cushions at the stroke ends only decelerate the piston; they do not hold the load, as that role belongs entirely to the mechanical clamp.
Airtac BSAI Locking Clamp Cylinder BSAI80X50S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI80X50S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø80 mm |
| Stroke | 50 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G3/8 |
| Rod thread | M20×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 3600 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 (Ø80 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa (max) | 3519 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (3600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI80X50S Is Used
Vertical Load Holding
Prevents gravity-driven drops on vertical axes by clamping the rod securely at any intermediate height during an unexpected power loss.
Machining Position Lock
Freezes the workpiece at a specific non-end stroke position for precise drilling or milling, ensuring no movement during the operation.
Mid-Stroke Safety Stop
Provides an immediate static hold anywhere in the travel range to protect operators and tooling during emergency stop conditions.
Is the Airtac BSAI Locking Clamp Cylinder BSAI80X50S the Right Clamp-Lock?
Select this 80 mm bore model when an application demands mid-stroke holding that exceeds the 1400 N capacity of the 50 mm bore variant, or when the 2200 N holding force of a 63 mm cylinder is insufficient for a heavy vertical load. If your process only requires locking at the fully extended or retracted stroke ends, a plain SAIL stroke-end lock cylinder would suffice and simplify the pneumatic plumbing. However, for holding a load at any arbitrary point in the travel, this BSAI clamp-lock is the correct choice. When replacing a unit, verify the 80 mm bore, 50 mm stroke, PT threaded ports, and the single-rod configuration. The standard carbon steel rod features an M20x1.5 thread, and its substantial 25 mm diameter provides excellent resistance to side loads. Mounting options for this single-rod profile cylinder include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2.
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 BSAI80X50S FAQ
The BSAI80X50-S provides a static holding force of 3600 N. It uses a spring-applied, air-released mechanism to grip the rod bidirectionally at any position along the 50 mm stroke, independent of the cylinder's 2513 N thrust capacity.
The clamp locks automatically once the cylinder has stopped moving, but it cannot brake a moving rod. To unlock it safely, air pressure must be balanced on both sides of the piston via the G1/8 enclasp port; otherwise, the rod may jump abruptly. Safety-critical applications require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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