Airtac SAILB Rear Lock Cylinder SAILB50X100
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB50X100 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 100mm 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.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB50X100
The AirTAC SAILB50X100 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. A spring-applied, air-released mechanism engages when the piston reaches the retracted stroke end, securely holding the rod without requiring live pressure. Delivering 982N of push force at 0.5MPa, it provides robust load management for pneumatic setups.
This unit features a 20mm carbon steel rod and a 1/4 PT port. The variable air cushion at the locker end is 20mm, intentionally shorter than the 30mm cushion on the free end. The lock releases automatically via air supply or manually via a lever, but remember it is a static holding device, not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB50X100 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB50X100 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 100 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (30 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILB50X100 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 a locked retracted position on a clamped workpiece without consuming continuous air pressure.
Gate Control
Secures heavy safety gates in the closed position mechanically until the release air is supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB50X100 the Right Lock Cylinder?
Choose this 50mm bore when 40mm lacks power (628N at 0.5MPa) or 63mm is excessive (1559N at 0.5MPa). Select SAILB to hold the load at the retracted rod-in position; choose SAILF if you must secure the extended rod-out end. If your application requires clamping at an arbitrary mid-stroke point rather than the stroke end, use the BSAI clamp-lock cylinder instead.
For safe operation, do not use a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. If human safety depends on the load staying retracted, add an independent safety measure. To match this cylinder for replacement, verify the 50mm bore, 100mm stroke, back locker position, 1/4 PT port, 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 SAILB50X100 FAQ
At 0.5MPa, the push force is 982N and the pull force is 825N. At 0.7MPa, the push force increases to 1374N. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released. It engages statically only when the piston reaches the retracted stroke end in the back cover. It unlocks automatically when release air is supplied to the port or manually via the release lever. It is not a dynamic brake and cannot stop a moving rod.
Related AirTAC Lock & Standard Cylinders
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