Airtac BSAI Locking Clamp Cylinder BSAI40X75S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X75S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 75mm 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 900 N.
- BoreØ40 mm
- Stroke75 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM12×1.25
- 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 BSAI40X75S
The AirTAC BSAI40X75-S is a double-acting ISO 15552 profile cylinder with a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any point along its 75mm travel, delivering a static holding force of 900 N. Because it includes a -S magnet, it supports AirTAC CMSE reed and DMSE solid-state sensors for position verification. Operating pressure ranges from 0.15 to 0.7 MPa.
It is crucial to distinguish holding force from thrust: the 900 N clamp rating is the mechanical grip on the rod, entirely separate from the cylinder's 628 N push thrust at 0.5 MPa. The variable air cushion only decelerates the piston near stroke ends; the enclasp clamp is what actually holds the load. Remember the clamp locks only after the rod stops—it cannot brake a moving load. Furthermore, unlocking requires balanced air pressure on both sides via the G1/8 enclasp port, or the rod may jump abruptly.
Airtac BSAI Locking Clamp Cylinder BSAI40X75S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X75S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 900 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 800 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 (Ø40 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (900 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI40X75S Is Used
Vertical Axis Hold
Prevents gravity-driven drops on vertical lifts by clamping the rod securely at any intermediate height during an air-pressure loss.
Mid-Stroke Safety Stop
Locks the payload safely in the middle of the 75mm travel for machine maintenance or inspection without returning to home.
Machining Position Hold
Secures a workpiece firmly in a specific processing location, absorbing external vibrations without relying on live air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X75S the Right Clamp-Lock?
Step down to a 32mm bore if your load requires only 402 N push thrust and 600 N holding force, or step up to a 50mm bore for 982 N thrust and 1400 N holding capacity. Choose this BSAI over a SAIL model when you must secure a load mid-stroke rather than just at the end of travel. If no holding is required, a plain SAI cylinder suffices. For safety-critical vertical loads, add an independent mechanical stop, as the clamp cannot arrest a moving rod.
Replacement specs: 40mm bore, 75mm stroke, single carbon steel rod with an M12x1.25 thread, PT port threads (1/4 cylinder port, G1/8 enclasp port), and -S magnet. Mounting options include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. The 16mm rod diameter handles moderate side loads well, but always guide the tooling externally to prevent binding.
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 BSAI40X75S FAQ
The built-in clamp-lock provides a static holding force of 900 N. It grips the rod bidirectionally at any position along the stroke, but only engages after the cylinder has stopped moving.
The clamp is released by supplying air to the G1/8 enclasp port after balancing the pressures on both sides of the piston. If pressures are not balanced, the rod can move abruptly upon release.
Related AirTAC Lock & Standard Cylinders
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