Airtac SAILB Rear Lock Cylinder SAILB100X300S
The AirTAC SAILB Rear Lock Cylinder SAILB100X300S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 300mm 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
- Stroke300 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 SAILB100X300S
The AirTAC SAILB100X300-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This lock engages automatically to hold the rod securely at the retracted stroke end whenever release air is cut, dropping the load safely without relying on live pressure. In the 100mm bore class, it delivers 5497N of push force and 3681N of pull force at 0.7MPa, making it suitable for heavy-load positioning.
Equipped with a magnet for position sensing, this model works seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. The variable air cushion decelerates the piston near the stroke terminals, though the cushion length at the locker end is shorter (24mm) than the free end (36mm). Unlocking is achieved by supplying air to the release port for automatic operation, or by using the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB100X300S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X300S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 300 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 SAILB100X300S Is Used
Vertical Lift Safety
Holds heavy vertical loads in the retracted position automatically during a power loss, preventing sudden drops.
Conveyor Pallet Stop
Secures a stopped pallet firmly at the rod-in stroke end while work is performed, releasing only when air is restored.
Machine Guard Hold
Locks a safety gate or guard in the closed position without consuming continuous air pressure.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X300S the Right Lock Cylinder?
Select this 100mm bore cylinder when an application requires substantial holding power at the retracted position, stepping up from an 80mm bore that provides 3518N push force at 0.7MPa. If less force is needed, dropping to an 80mm unit saves space. Choose the SAILB configuration when the load must be secured in the rod-in position; select a SAILF front-locker variant if the extended end requires holding. For applications needing the load clamped at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Because the stroke is 300mm, use a guide rail or external load-support mechanism to prevent excessive side-loading on the rod. The lock is a static holding device that engages 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 unintentionally release the lock; instead, use an independent-exhaust solenoid valve. If human safety depends on the load remaining retracted, add an independent mechanical safety measure. Replacement requires matching the 100mm bore, 300mm stroke, back locker position, PT tapered port threads, and the -S magnet option.
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 SAILB100X300S FAQ
At 0.7MPa operating pressure, the 100mm bore provides 5497N of push force and 3681N of pull force. At 0.5MPa, the push force is 3927N and the pull force is 3681N.
The lock is spring-applied and air-released, located in the back cover to hold the rod only at the retracted stroke end. It engages statically after the piston stops and is released automatically via air pressure or manually via a lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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