Airtac SAILB Rear Lock Cylinder SAILB40X175
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB40X175 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 175mm stroke and a built-in spring-applied, air-released mechanical lock in the back cover — it holds the load at the retracted (rod-in) stroke end even when air is lost.
- BoreØ40 mm
- Stroke175 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM12×1.25
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB40X175
The AirTAC SAILB40X175 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the back cover. This lock engages when the piston reaches the retracted stroke end, securing the load without requiring continuous live air pressure. Delivering 628N of push force at 0.5 MPa, it provides reliable holding for lighter loads.
The locker-end variable air cushion measures 20mm, which is intentionally shorter than the 27mm cushion found on the non-locking free end. This cylinder lacks a standard piston magnet, meaning position sensing via CMSE reed or DMSE electronic switches is not supported without modification. The standard carbon steel rod offers dependable durability for general industrial environments.
Airtac SAILB Rear Lock Cylinder SAILB40X175 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB40X175 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 175 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released (back cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable (27 mm free end / 20 mm lock end) |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAIL datasheet (ISO 15552). Confirm against the product label before installation. Port options: PT / G.
How the Lock Holds
The lock is spring-applied and air-released: a spring drives a lock pin into the rod when the release air is removed, so the load is held at the retracted (rod-in) stroke end without live pressure. Supply air to the release port to unlock automatically, or use the manual release lever.
The lock engages only when the piston reaches the stroke terminal on the back-cover side — it is a static end-of-stroke hold, not a mid-stroke clamp and not a moving-rod brake. For locking at any position along the stroke, choose a BSAI clamp-lock instead.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Cylinder thrust is separate from the lock's holding capability. Actual usable force is lower than theoretical due to friction and back-pressure — size with a margin.
Where the Airtac SAILB Rear Lock Cylinder SAILB40X175 Is Used
Vertical Load Holding
Secures vertical loads in the retracted position during power loss, preventing sudden drops.
End-Stroke Clamping
Holds workpieces firmly at the retracted stroke end without consuming continuous air pressure.
Gate Safety Locking
Keeps safety gates and guards locked shut at the stroke terminal until release air is supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB40X175 the Right Lock Cylinder?
Choose this 40mm bore when your application requires 628N of push force at 0.5 MPa; if you need roughly 982N, step up to the 50mm bore version. Select the SAILB configuration when the load must be held safely in the retracted position, and choose SAILF instead if the extended end requires holding. If your design requires clamping at an arbitrary mid-stroke point rather than a stroke-end hold, the BSAI clamp-lock cylinder is the correct alternative.
Remember that this lock is a static holding device that engages only after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. For safety-critical lifting applications, add an independent mechanical safety measure. Replacement matches require a 40mm bore, 175mm stroke, back locker position, PT tapered ports, and standard mounting options like FA, FB, or TC.
Quick checklist
- ✓ Hold needed at the retracted (rod-in) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILB Rear Lock Cylinder SAILB40X175 FAQ
At 0.5 MPa, the 40mm bore provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The spring-applied, air-released lock engages automatically when the rod reaches the retracted stroke end in the back cover. To unlock, supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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