Airtac SAILB Rear Lock Cylinder SAILB100X50
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X50 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 50mm 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
- Stroke50 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 SAILB100X50
The AirTAC SAILB100X50 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. A carbon steel rod delivers 3927N of push force at 0.5MPa. The lock is spring-applied and air-released, meaning it safely holds the rod at the retracted stroke end whenever release air is cut off.
This unit uses a 1/2-inch PT tapered port and operates at speeds from 30-800mm/s. The variable air cushion at the locker end is slightly shorter (24mm) than the free end (36mm) to accommodate the locking mechanism. You can unlock it automatically by supplying air to the release port or by using the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB100X50 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X50 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 50 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 SAILB100X50 Is Used
Vertical Load Holding
Maintains a lifted platform in the retracted position safely without continuous air pressure.
Clamp and Hold
Secures a workpiece at the retracted stroke end during power loss to prevent accidental movement.
Safety Gate Hold
Keeps heavy safety gates locked in the closed position until release air is supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X50 the Right Lock Cylinder?
Choose this SAILB model when you need a cylinder to maintain a retracted position during power loss. If your application requires holding an extended load, select the SAILF front-locker variant instead. For loads that must be clamped at arbitrary mid-stroke positions rather than at the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Remember this is a static holding lock that engages after the rod stops, not a dynamic brake. Avoid fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; use an independent-exhaust solenoid valve. If human safety depends on the load staying up, add an independent safety measure. Replacement parts must match the 100mm bore, 50mm stroke, back locker position, PT port, and standard carbon steel rod.
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 SAILB100X50 FAQ
At 0.5MPa operating pressure, the push force is 3927N and the pull force is 3681N. At 0.7MPa, the push force increases to 5497N.
The lock is spring-applied and air-released. It holds the rod statically at the retracted stroke end when air is cut off. You can unlock it automatically by supplying release air or manually via the lever. It is not a mid-stroke clamp.
Related AirTAC Lock & Standard Cylinders
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