Airtac BSAI Locking Clamp Cylinder BSAI125X1000S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X1000S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 1000mm 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 8600 N.
- BoreØ125 mm
- Stroke1000 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X1000S
The AirTAC BSAI125X1000-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 1000 mm travel, delivering a robust 8600 N static holding force. Operating at 0.15-0.7 MPa, it generates 6136 N thrust at 0.5 MPa and up to 8590 N at 0.7 MPa. Remember that holding force and thrust are distinct quantities; you must size the 8600 N clamp against your static load, not the 8590 N cylinder thrust.
This enclasp mechanism requires a third G1/8 unlock port alongside the twin 1/2 PT cylinder ports. Because the variable air cushion only decelerates the piston near stroke ends, the mechanical clamp is solely responsible for securing the load. The lock engages strictly after the rod stops, so it cannot brake a moving rod, and releasing requires balanced air pressure to prevent abrupt rod jump. The -S magnet integrates with CMSE reed and DMSE solid-state sensors for position feedback.
Airtac BSAI Locking Clamp Cylinder BSAI125X1000S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X1000S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 1000 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 8600 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 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 (Ø125 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (8600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI125X1000S Is Used
Vertical Lift Hold
Secures heavy vertical loads at any intermediate height, preventing sudden drops during air pressure loss on lifting jigs.
Power Failure Safety
Maintains position anywhere in the 1000 mm travel during sudden power outages, locking the carbon steel rod instantly once motion stops.
Machining Position Lock
Freezes the workpiece at a precise intermediate spot for multi-stage machining or inspection without relying on live air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X1000S the Right Clamp-Lock?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N thrust at 0.5 MPa and 5500 N holding force) cannot safely support your vertical load. If full-stroke end holding is sufficient, a plain SAI cylinder avoids the clamp complexity, but BSAI wins when intermediate stops are needed. Unlike SAIL, which only locks at stroke ends, this model clamps anywhere.
For this 1000 mm stroke, the M27x2 rod thread and 32 mm diameter provide excellent side-load capacity, but an external guide is still recommended for unsupported spans. Replacements must match the single rod, 125 mm bore, 1000 mm stroke, 1/2 PT ports, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). Ensure the -S magnet pairs with your CMSE/DMSE switches. Safety-critical loads require 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 BSAI125X1000S FAQ
The built-in clamp-lock provides a static holding force of 8600 N. It locks the rod bidirectionally at any position along the stroke, but only engages after the cylinder has stopped moving.
The clamp is spring-applied and air-released via a G1/8 port. To prevent the rod from jumping abruptly, air pressure on both sides of the piston must be balanced before unlocking. It is not a braking device for moving rods.
Related AirTAC Lock & Standard Cylinders
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