Airtac SAILB Rear Lock Cylinder SAILB100X300
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X300 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 SAILB100X300
The AirTAC SAILB100X300 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 secure the rod at the retracted stroke end, holding loads safely without requiring live air pressure. In the 100 mm bore class, it delivers a 0.5 MPa push force of 3927 N and a pull force of 3681 N.
The carbon steel rod provides robust side-load resistance for heavy-duty guiding. While the variable air cushion decelerates the piston near the stroke terminals, the lock is the true holding mechanism. Note that the cushion at the locker end is shorter (24 mm) than the free end (36 mm) to accommodate the locking hardware.
Airtac SAILB Rear Lock Cylinder SAILB100X300 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X300 |
|---|---|
| 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 SAILB100X300 Is Used
Vertical Lift Safety
Secures elevated loads in the retracted position instantly if air pressure drops, preventing sudden drops on vertical lifting platforms.
Conveyor Hold
Locks a heavy conveyor diverter in the retracted stroke-end position during power loss to maintain lane separation safely.
Machine Guarding
Holds safety gates and heavy machine guards firmly closed in the rod-in position without consuming continuous pneumatic energy.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X300 the Right Lock Cylinder?
Select this 100 mm bore model when an application demands substantial retracted-load holding power; if less force is needed, an 80 mm bore provides 2513 N at 0.5 MPa. Choose SAILB to hold the rod-in position, or SAILF if the extended position must be secured. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke end, use the BSAI clamp-lock cylinder instead.
The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for moving rods. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; utilize an independent-exhaust solenoid valve instead. For any human-safety critical lifting application, add an independent safety measure. At 300 mm stroke, ensure external guide rails are used to prevent excessive side-loading on the rod. Replacement specifications: 100 mm bore, 300 mm stroke, back locker, PT port threads, standard carbon steel rod, no sensor magnet.
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 SAILB100X300 FAQ
At 0.5 MPa operating pressure, the 100 mm bore provides a push force of 3927 N and a pull force of 3681 N. At 0.7 MPa, the push force increases to 5497 N.
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. You can unlock it automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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