Airtac BSAID Clamp Cylinder BSAID125X250S
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X250S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 250mm 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
- Stroke250 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X250S
The AirTAC BSAID125X250-S is a double-acting ISO 15552 profile cylinder featuring a double-rod layout and a spring-applied, air-released clamp-lock mechanism. It provides a massive static holding force of 8600 N, gripping the rod securely at any position along its 250 mm travel. Because it is a double-rod unit, the thrust is identical in both directions at 5734 N (0.5 MPa), and the twin rods allow mounting a workpiece on one end with a counterweight or position flag on the opposite end for dual-side guidance. It includes a -S magnet for CMSE reed and DMSE electronic sensors.
It is crucial to distinguish between holding force and cylinder thrust: the 8600 N clamp force is a static brake applied to the rod, entirely separate from the 5734 N pneumatic driving force. The clamp requires a third G1/8 enclasp port to release the lock, operating within a balanced pressure range of 0.15-0.7 MPa. Furthermore, the variable air cushions only decelerate the piston near the stroke ends; they do not hold the load, as the clamp mechanism alone bears that burden.
Airtac BSAID Clamp Cylinder BSAID125X250S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X250S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 mm |
| Type | Double rod (BSAID), 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 | — |
Equal force both directions (double rod). 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 BSAID Clamp Cylinder BSAID125X250S Is Used
Heavy Vertical Load Holding
Maintains elevated platens securely at any height along the stroke with 8600 N of static grip, preventing falls when air pressure is removed.
Machining Position Lock
Freezes a heavy workpiece carriage at a precise mid-stroke coordinate for machining or inspection, utilizing the twin rods for anti-rotation stability.
Power Failure Safety Hold
Spring-applied clamp engages instantly upon loss of air supply to lock the rod in place, safely arresting any drift during an emergency shutdown.
Is the Airtac BSAID Clamp Cylinder BSAID125X250S the Right Clamp-Lock?
Choose this 125 mm bore model when an application demands extreme mid-stroke holding that a plain SAI or SAID cannot provide, and when a stroke-end-only lock like the SAIL is insufficient. If you need less force, stepping down to the 100 mm bore yields a 5500 N holding force and 3681 N equal-direction thrust, but for heavy vertical loads, this 125 mm unit is required. Remember that the clamp locks only after the rod has completely stopped; it cannot brake a moving load. Unlocking requires balanced air pressures on both piston sides, or the rod may jump abruptly. For safety-critical human-interaction applications, an additional independent safety measure is mandatory.
This replacement unit features a carbon steel rod with an M27x2 thread, PT tapered ports (1/2 inch cylinder ports plus the G1/8 enclasp port), and a -S magnet for DMSE/CMSE switches. Being a double-rod cylinder, the mounting set omits FB, CA, CB, and CR options, supporting only Basic, FA, LB, TC, TCM1, and TCM2 brackets. The 32 mm rod diameter provides excellent stiffness against side loads, though any stroke over 300 mm requires external guide support.
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 BSAID Clamp Cylinder BSAID125X250S FAQ
This cylinder provides a static holding force of 8600 N. The clamp is bidirectional and spring-applied, meaning it will grip the rod at any position along the 250 mm stroke to hold the load securely without requiring continuous live air pressure.
The clamp locks only after the cylinder has stopped moving; it cannot brake a moving rod. To release the lock safely, you must apply air to the G1/8 enclasp port only after the pressures on both sides of the piston are balanced. Otherwise, the rod can move abruptly upon unlocking.
Related AirTAC Lock & Standard Cylinders
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