Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 100mm 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
- Stroke100 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 SAILF125X100
The AirTAC SAILF125X100 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. A spring-applied, air-released lock engages when the piston reaches the extended stroke end, securely holding the load without requiring live pressure. In the 125mm bore class, this actuator generates 6136N of push force and 5734N of pull force at 0.5 MPa, making it well-suited for heavy-duty holding tasks. The standard carbon steel rod provides robust durability for demanding industrial environments.
Unlike a plain SAI cylinder, this model securely maintains the extended position during a power loss. The lock is strictly a static holding device that engages after the rod stops, rather than a dynamic brake for a moving load. To unlock, you simply supply air to the release port or use the manual override lever. Note that the variable air cushion at the locker end is 24mm, which is shorter than the 40mm cushion on the free end, a specific design adjustment to accommodate the locking hardware.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAILF125X100 Is Used
Extended Lift Holding
Maintains a vertical load in the extended position during a power loss, preventing sudden drops when air pressure is cut off.
Safety Gate Barrier
Keeps a heavy safety gate fully extended and locked open without consuming continuous air, releasing only when commanded.
Static Clamp at Stroke End
Secures heavy workpieces at the full extended position, providing a reliable mechanical hold for machining or welding.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100 the Right Lock Cylinder?
Select this 125mm bore model when an application requires 6136N of push force at 0.5 MPa and must hold a load securely at the extended stroke end. If your system requires less force, stepping down to the 100mm bore yields 3927N of push force at 0.5 MPa. Conversely, if you need to hold the load at the retracted stroke end instead of the extended end, choose the SAILB125X100 variant. Because the stroke is 100mm, standard side-load guidelines apply, but always ensure adequate guide support for the 32mm carbon steel rod.
If your application requires locking at an arbitrary mid-stroke position rather than only at the extended stroke end, you must use the BSAI clamp-lock cylinder instead. For the SAILF lock to function safely, never use a fast-exhaust valve, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load remaining extended, add an independent safety measure as well. When ordering replacements, verify the 100mm stroke, front locker position, 1/2-inch PT port, mounting style, and sensor requirements.
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 SAILF125X100 FAQ
At 0.5 MPa operating pressure, the 125mm bore provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The lock is spring-applied and air-released, engaging only after the piston reaches the extended stroke end. It provides a static hold, not a dynamic brake. To unlock, supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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