Airtac BSAI Locking Clamp Cylinder BSAI125X100
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X100 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 100mm 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
- Stroke100 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X100
The AirTAC BSAI125X100 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock mechanism. It secures the 32mm carbon steel piston rod at ANY position along its 100mm stroke, delivering a robust static holding force of 8600 N. Operating within a 0.15-0.7 MPa pressure range, it generates 6136 N of push thrust at 0.5 MPa. You must distinguish this holding force from thrust: the 8600 N clamp rating secures the static load independently, whereas the 6136 N thrust dictates the cylinder's motive power. The clamp locks bidirectionally, ensuring stability whether the rod was extending or retracting.
This model features PT tapered port threading, with a 1/2 inch cylinder port and a separate G1/8 enclasp port for the unlock air supply. The integrated variable air cushion decelerates the piston near stroke ends, but the cushion is not the lock; the mechanical clamp is what holds the load. For position sensing, this non-magnetic variant lacks the -S option, meaning AirTAC CMSE reed and DMSE electronic sensors cannot be used without a rod magnet.
Airtac BSAI Locking Clamp Cylinder BSAI125X100 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X100 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 BSAI125X100 Is Used
Vertical Load Holding
Secures heavy elevated platens at any point in the vertical travel path, preventing gravity-driven falls during a sudden compressed air loss.
Machining Position Lock
Freezes a heavy workpiece carriage mid-stroke for high-deflection machining operations, ensuring the 32mm rod stays rigid under cutting forces.
Power-Out Safety Hold
Maintains a 8600 N mechanical grip on the carbon steel rod during facility power outages, safely locking heavy actuators in their last stopped position.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X100 the Right Clamp-Lock?
Select this 125mm bore model when an application demands extreme mid-stroke holding capacity that a smaller bore cannot satisfy. If 8600 N of holding force exceeds your requirement, stepping down to a 100mm bore provides 5500 N of holding force alongside 3927 N of thrust at 0.5 MPa. Choose this BSAI over a SAIL cylinder when you need to secure a load at an arbitrary mid-stroke point rather than only at the stroke end. If live-position holding is unnecessary, a plain SAI cylinder suffices. Remember that the clamp locks only after the rod has stopped; it cannot brake a moving load. Furthermore, you must balance air pressures on both sides of the piston before unlocking, or the rod may jump abruptly. For safety-critical human-interfacing applications, an additional independent safety measure is mandatory.
As a replacement, match the single-rod configuration, 125mm bore, 100mm stroke, PT port threads, and the correct mounting set. BSAI accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The substantial 32mm rod and M27x2 thread provide excellent resistance to side loads, though long unsupported strokes still require an external guide.
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 BSAI125X100 FAQ
The BSAI125X100 features a static holding force of 8600 N. This bidirectional clamp secures the piston rod at any position along the 100mm stroke, holding the load independently of the cylinder's 6136 N push thrust.
No, the clamp locks only AFTER the cylinder has stopped; it cannot brake a moving rod. Additionally, you must balance the air pressures on both sides of the piston before releasing the clamp, otherwise the rod may move abruptly upon unlock.
Related AirTAC Lock & Standard Cylinders
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