Airtac SAILB Rear Lock Cylinder SAILB80X225
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X225 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 225mm 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.
- BoreØ80 mm
- Stroke225 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X225
The AirTAC SAILB80X225 is a double-acting ISO 15552 profile cylinder featuring a mechanical lock built into the back cover. Because this is a SAILB variant, the spring-applied, air-released lock engages when the piston reaches the retracted stroke end, securely holding the rod-in position without requiring live pressure. At 0.5 MPa, it delivers 2513 N of push and 2268 N of pull thrust, scaling up to 4523 N at 0.9 MPa. The 225 mm stroke is a non-standard length for this bore.
This unit uses a 25 mm carbon steel rod and a 3/8 PT port. The variable air cushion at the locker end is 22.5 mm, intentionally shorter than the 36 mm cushion at the free end to accommodate the locking mechanism. To release the lock, supply air to the release port for automatic unlocking or use the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB80X225 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X225 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 225 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (36 mm free end / 22.5 mm lock end) |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SAILB80X225 Is Used
Vertical Lift Safety
Holds a lifted load securely at the retracted stroke end during a power loss, preventing sudden drops.
Clamp and Hold
Maintains clamping force on a workpiece at the rod-in position without continuously consuming compressed air.
Gate and Guard Locking
Secures safety gates or heavy machine guards in the closed position until air is actively supplied to release.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X225 the Right Lock Cylinder?
Choose this 80 mm bore when a 50 mm bore (1374 N push at 0.7 MPa) lacks the power to hold your load, but a 100 mm bore (5497 N push at 0.7 MPa) is physically oversized. Select SAILB specifically when the load must be secured at the retracted rod-in position; choose SAILF if your application requires holding at the extended rod-out position. If your machine needs to lock at an arbitrary mid-stroke point rather than at the stroke end, use the BSAI clamp-lock cylinder instead. Since the 225 mm stroke exceeds the 150 mm standard maximum for this bore, this is a non-standard configuration requiring custom validation.
For safe operation, do not use a fast-exhaust valve with this lock cylinder. Use an individual-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the lock. The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. If human safety depends on the load remaining retracted, add an independent safety measure. Replacement requires matching the 80 mm bore, 225 mm stroke, back locker position, 3/8 PT port, and the desired mounting style (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, or TCM2).
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 SAILB80X225 FAQ
At 0.5 MPa, the 80 mm bore provides 2513 N of push and 2268 N of pull thrust. At 0.7 MPa, it delivers 3518 N of push, and at 0.9 MPa, it provides 4523 N of push.
The lock is spring-applied and air-released, engaging only at the retracted stroke end to hold the load statically. It does not clamp at mid-stroke. Unlock automatically by supplying air to the release port or use the manual release lever. Avoid fast-exhaust valves, as back-pressure can unintentionally release the lock.
Related AirTAC Lock & Standard Cylinders
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