Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 800mm stroke and a built-in spring-applied, air-released mechanical lock in the front cover — it holds the load at the extended (rod-out) stroke end even when air is lost.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Lock positionFront cover
- Rod threadM27×2
- 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 SAILF Front Locking Pneumatic Cylinder SAILF125X800
The AirTAC SAILF125X800 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock integrated into the front cover. This lock engages automatically when the piston reaches the extended stroke end, securely holding the load without requiring continuous live air pressure. Delivering a push force of 6136N at 0.5MPa, it is built with a carbon steel rod and utilizes a PT tapered port thread.
Because the lock is located in the front cover, it clamps the rod specifically at the extended position rather than at an arbitrary mid-stroke point. The variable air cushion at the locker end is notably shorter, measuring 24mm compared to the 40mm cushion on the free end. To ensure safe operation, avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 800 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released (front cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable (40 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 extended (rod-out) 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 front-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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 SAILF Front Locking Pneumatic Cylinder SAILF125X800 Is Used
Extended Lift Holding
Maintains vertical loads securely at the top extended stroke end during a power loss, preventing sudden drops without needing continuous air pressure.
Clamp and Hold
Applies 6136N of clamping force at 0.5MPa and locks the part in place at the extended end, ensuring workpiece stability during machining operations.
Safety Gate Lock
Secures heavy safety gates or machine guards in the open extended position, engaging the spring lock automatically to protect operators.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800 the Right Lock Cylinder?
Choose this 125mm bore cylinder when an application demands high thrust, such as 8590N at 0.7MPa, combined with a guaranteed hold at the extended stroke end. If your mechanism requires holding at the retracted end instead, select the SAILB125X800; if you need to clamp the rod at an intermediate mid-stroke position, the BSAI clamp-lock cylinder is the correct choice. For this 800mm stroke, adding an external guide is highly recommended to prevent excessive side loads on the rod.
Remember that this is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod. The lock holds the load securely on power loss, but if human safety depends on the load remaining elevated, you must add an independent safety measure. When replacing a unit, verify the 125mm bore, 800mm stroke, front locker position, PT port, and your required mounting style.
Quick checklist
- ✓ Hold needed at the extended (rod-out) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800 FAQ
At an operating pressure of 0.5MPa, the SAILF125X800 provides a push force of 6136N and a pull force of 5734N. At 0.7MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, meaning it engages automatically when the rod reaches the extended stroke end. To unlock it, you supply air to the release port or use the manual release lever. It only holds at the extended stroke end, not at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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