Airtac SAILB Rear Lock Cylinder SAILB100X900S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X900S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 900mm 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
- Stroke900 mm
- Port sizeG1/2
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB100X900S
The AirTAC SAILB100X900-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. Because the lock is spring-applied and air-released, cutting the release air drives a lock pin into the rod, securely holding the load at the retracted stroke end without requiring live pressure. With a 100mm bore, it generates 5497N of push force at 0.7 MPa and includes a magnetic piston for position sensing.
This model uses a PT tapered port thread and a carbon steel rod. The variable air cushion at the locker end measures 24mm, which is intentionally shorter than the 36mm cushion at the free end to accommodate the locking hardware. For power-loss safety, the lock engages automatically after the piston stops, but it is a static holding device, not a dynamic brake.
Airtac SAILB Rear Lock Cylinder SAILB100X900S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X900S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 900 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 SAILB100X900S Is Used
Vertical Lift Safety
Holds heavy vertical lifts securely in the retracted position during a power loss or emergency stop, preventing sudden drops.
Pallet Stopper
Locks a 900mm extended stopper pin in the retracted end position to hold pallets on a conveyor line without continuous air supply.
Safety Gate Hold
Maintains a safety gate in the closed and retracted state, keeping the barrier secure even if the plant air supply is completely vented.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X900S the Right Lock Cylinder?
Choose this 100mm bore when the 80mm bore (providing 3518N push at 0.7 MPa) is insufficient, or step up to the 125mm bore (8590N at 0.7 MPa) if your vertical load exceeds 5497N. Select the SAILB configuration when the load must be held in the retracted position; choose SAILF if you need to hold the extended rod-out position. If your application requires clamping at an arbitrary mid-stroke point rather than the stroke end, use the BSAI clamp-lock cylinder instead.
When matching replacements, verify the 100mm bore, 900mm stroke, back locker position, PT ports, and the -S magnet. Since the 900mm stroke is substantial, use a guide rail to prevent rod sag and side-load damage. Avoid fast-exhaust valves; back-pressure on the locker side can unintentionally release the lock, so use an independent-exhaust solenoid valve. Always add an independent mechanical safety measure if human safety depends on the load staying up.
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 SAILB100X900S FAQ
The 100mm bore generates 3927N push and 3681N pull at 0.5 MPa, or 5497N push and 7068N pull at 0.7 MPa. The maximum operating pressure is 1.0 MPa.
The spring-applied, air-released lock engages only at the retracted stroke end in the back cover. It holds the load statically after the rod stops; it is not a mid-stroke clamp or dynamic brake. Unlock automatically by supplying release air, or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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