Airtac SAILB Rear Lock Cylinder SAILB80X75
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X75 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 75mm 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.
- BoreØ80 mm
- Stroke75 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X75
The AirTAC SAILB80X75 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the back cover. This lock engages automatically to hold the rod securely at the retracted stroke end whenever release air is cut, maintaining the load without live pressure. Delivering 2513N of push force at 0.5MPa, it is dimensionally interchangeable per ISO 15552 mounting interfaces while adding critical power-failure safety.
The locker end features a shorter variable air cushion of 22.5mm compared to the 36mm cushion on the free end, specifically accommodating the lock mechanism. The lock is a static holding device that engages after the cylinder stops, rather than a dynamic brake for a moving rod. For position feedback, the barrel includes sensor grooves compatible with AirTAC CMSE reed and DMSE electronic solid-state switches, though this specific SKU is configured without a magnet.
Airtac SAILB Rear Lock Cylinder SAILB80X75 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X75 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 75 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| 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 / 22.5 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SAILB80X75 Is Used
Vertical Load Holding
Secures elevated loads at the retracted stroke end during power loss, preventing gravity-driven drops in lifting equipment.
Safety Gate Lock
Holds safety barriers and heavy gates firmly closed at the retracted position without relying on continuous air pressure.
Clamp and Hold
Maintains clamping force on heavy workpieces at the stroke end, ensuring stability during machining operations.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X75 the Right Lock Cylinder?
Step down to a 63mm bore if 1559N of push force at 0.5MPa is sufficient, or step up to a 100mm bore for 3927N if your load requires greater thrust. Choose this SAILB configuration when the load must be held at the retracted position; select SAILF instead if the extended stroke end requires holding. If your application needs to lock at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Remember that the lock holds statically at the stroke end and does not stop a moving rod. Avoid using a fast-exhaust valve with this cylinder, as back-pressure on the locker side can inadvertently release the lock; use an independent-exhaust solenoid valve instead. For safety-critical loads that must stay up during a complete power loss, add an independent secondary safety measure. Replacement parts require matching the 80mm bore, 75mm stroke, PT tapered port, back locker position, and the full mounting set including Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, and TCM2.
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 SAILB80X75 FAQ
At 0.5MPa, the SAILB80X75 provides 2513N of push force and 2268N of pull force. At 0.7MPa, the push force increases to 3518N, and it reaches a maximum push force of 4523N at 0.9MPa.
The lock is spring-applied and air-released, engaging only at the retracted stroke end to hold the load statically without live pressure. To unlock, supply air to the release port for automatic release, or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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