Airtac BSAI Locking Clamp Cylinder BSAI50X25
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X25 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 25mm 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
- Stroke25 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 BSAI50X25
The AirTAC BSAI50X25 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It delivers 982N of thrust at 0.5 MPa and firmly holds the load at any position along its 25mm stroke with a static holding force of 1400N. Remember that holding force and thrust are separate quantities; you must size the 1400N clamp capacity against your static load, not the cylinder's push force.
This bidirectional enclasp locks the carbon steel rod only after the cylinder has stopped, meaning it cannot brake a moving piston. Unlocking requires a third G1/8 enclasp port and balanced air pressure on both sides of the piston to prevent the rod from jumping abruptly. Furthermore, the variable air cushion only decelerates the piston near stroke end; the mechanical clamp is the sole device holding the load.
Airtac BSAI Locking Clamp Cylinder BSAI50X25 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X25 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 25 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 BSAI50X25 Is Used
Vertical Axis Hold
Maintains a 1400N grip on the carbon steel rod at any point in the 25mm travel to prevent vertical loads from dropping when air pressure is removed.
Mid-Travel Positioning
Secures a workpiece at a precise intermediate height for machining or inspection, offering a true lock-anywhere advantage over stroke-end-only cylinders.
Power Loss Safety
The spring-applied clamp engages automatically upon air loss, safely freezing the load exactly where it stopped without relying on the air cushion.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X25 the Right Clamp-Lock?
Choose this 50mm bore when a 40mm bore (528N pull thrust, 900N hold) lacks sufficient load capacity, but a 63mm (1402N pull thrust, 2200N hold) is physically oversized. The BSAI50X25 is preferred over a SAIL model when you need to secure a load mid-stroke rather than only at the end of travel. For simple extension tasks without holding requirements, a plain SAI cylinder suffices.
This model features a 20mm carbon steel rod with an M16x1.5 thread, PT tapered ports, and a 1/4 inch cylinder port. It supports Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Since no magnet is specified, it cannot use CMSE or DMSE sensors. The clamp locks only after the rod stops and requires balanced pressure to unlock safely; human-safety applications need an independent backup measure.
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 BSAI50X25 FAQ
The integrated clamp-lock provides a static holding force of 1400N. It grips the rod at any position bidirectionally, but it only engages after the cylinder has completely stopped moving.
The clamp is released by supplying air to the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. If pressures are not balanced, the rod can move abruptly upon release.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac BSAI Locking Clamp Cylinder BSAI50X25
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.