Airtac SAILB Rear Lock Cylinder SAILB100X250
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X250 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 250mm 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
- Stroke250 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 SAILB100X250
The AirTAC SAILB100X250 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. Because the lock sits in the back, it securely holds the rod at the retracted stroke end. This 100mm bore size generates a substantial 3927N of push force at 0.5MPa, making it ideal for heavy-duty load management. The lock engages automatically when pressure is removed, ensuring safety during power loss.
A key design trait is that the variable air cushion at the locker end is only 24mm, noticeably shorter than the 36mm cushion on the free end, optimizing end-of-stroke damping without interfering with the lock mechanism. The standard carbon steel rod provides excellent durability, and the barrel features dual sensor grooves ready for CMSE reed or DMSE electronic switches if a magnet is added later. Remember that this is a static holding lock, not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB100X250 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X250 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 250 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 SAILB100X250 Is Used
Vertical Load Holding
Secures heavy lifted loads in the retracted position instantly upon air pressure loss, preventing sudden drops.
Clamp and Hold
Maintains high-force clamping pressure at the retracted stroke end without consuming continuous compressed air.
Safety Gate Lock
Keeps heavy safety gates or machine guards locked closed at the stroke terminal until release air is supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X250 the Right Lock Cylinder?
Choose this 100mm bore when your application requires robust holding power at the retracted position, as stepping down to an 80mm bore drops the push force to 2513N at 0.5MPa. If your load must be clamped at an arbitrary mid-stroke point rather than the stroke end, select the BSAI clamp-lock cylinder instead. For the SAILB100X250, the lock holds statically only after the piston stops at the retracted end; it cannot brake a moving rod.
Valve selection is critical: never use a fast-exhaust valve with this lock cylinder, as back-pressure on the locker side can unintentionally release the lock. Always use an independent-exhaust solenoid valve. If human safety depends on the load staying retracted, add an independent mechanical safety measure as well. When replacing, match the 100mm bore, 250mm stroke, back locker position, PT tapered port thread, 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 SAILB100X250 FAQ
At 0.5MPa, the 100mm bore provides 3927N of push force and 3681N of pull force. At 0.7MPa, the push force increases to 5497N.
The lock is spring-applied and air-released, located in the back cover to hold the rod at the retracted stroke end. It engages statically after the cylinder stops and is unlocked automatically by supplying release air or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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