Airtac SAILB Rear Lock Cylinder SAILB100X225
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X225 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm 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.
- BoreØ100 mm
- Stroke225 mm
- Port sizeG1/2
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
- 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 SAILB Rear Lock Cylinder SAILB100X225
The AirTAC SAILB100X225 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. Because the lock engages when the piston reaches the retracted stroke end, it securely holds the rod in position without requiring continuous live air pressure. In this bore size, the cylinder provides a substantial 3927N push force at 0.5MPa and 5497N at 0.7MPa, making it well-suited for heavy vertical load-holding tasks.
The lock itself is a static holding device, not a dynamic brake for a moving rod. It is important to note that the variable air cushion at the locker end is physically shorter than at the free end, measuring 24mm versus 36mm. The lock releases automatically when air is supplied to the release port, or manually via the lever, and the carbon steel rod uses a PT 1/2 port connection.
Airtac SAILB Rear Lock Cylinder SAILB100X225 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X225 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 225 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| 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 / 24 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SAILB100X225 Is Used
Vertical Lift Safety
Holds heavy lifted masses securely at the retracted stroke end on the back cover, preventing sudden drops during a total power loss.
End-of-Stroke Clamping
Maintains a rigid, static clamp on the carbon steel rod once the piston fully retracts, ensuring the load stays firmly positioned without live air.
Gate and Guard Holding
Secures heavy safety gates or machine guards in the closed position, relying on the spring-applied lock to maintain the barrier without constant pressure.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X225 the Right Lock Cylinder?
Choose this 100mm bore when an 80mm bore (providing 2513N push at 0.5MPa) is insufficient for your load, but a 125mm bore is oversized. This SAILB variant is specifically selected when the load must be secured at the rod-in position; if your application requires holding at the extended rod-out position, the SAILF100X225 is the correct alternative. If your process demands locking at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is required instead.
For safe operation, never use a fast-exhaust valve with this cylinder; an independent-exhaust solenoid valve is mandatory because back-pressure on the locker side can unintentionally release the lock. Always add an independent mechanical safety measure if human safety depends on the load remaining elevated. Replacement specifications must match the 100mm bore, 225mm stroke, back locker position, PT 1/2 port, and standard carbon steel rod. The operating speed range is 30-800 mm/s.
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 SAILB100X225 FAQ
At 0.5MPa, the push force is 3927N and the pull force is 3681N. At 0.7MPa, the push force increases to 5497N, and at 0.9MPa it reaches 7068N.
The lock is spring-applied and air-released, engaging only when the rod reaches the retracted stroke end in the back cover. It provides a static hold, not a dynamic brake, and unlocks automatically via air supply or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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