Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S 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
About the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S
The AirTAC SAILF125X100-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is an SAILF variant, the spring-applied, air-released lock engages when the piston reaches the extended stroke end, securely holding a load in the rod-out position even if air pressure is lost. In this bore size, the cylinder generates 6136N of push force and 5734N of pull force at 0.5 MPa, making it well-suited for heavy-duty vertical lifting and holding tasks.
This model includes a standard magnet (-S) for use with AirTAC CMSE reed and DMSE electronic solid-state sensors. The variable air cushion at the locker end is 24mm, which is intentionally shorter than the 40mm cushion at the free end to accommodate the locking mechanism. You can unlock the rod automatically by supplying air to the release port, or manually via the lever. The carbon steel rod and PT tapered port threads are standard, and the extruded aluminum barrel provides a rigid, modern profile structure.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S |
|---|---|
| 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 SAILF125X100S Is Used
Vertical Lift Safety
Holds a heavy vertical load safely at the extended top position during a power loss, preventing gravity-driven crashes.
Extended Clamp Hold
Maintains outward clamping pressure on a heavy workpiece without consuming continuous compressed air.
Gate & Guard Locking
Secures a heavy safety gate or guard in the open, extended position until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X100S the Right Lock Cylinder?
Choose this 125mm bore cylinder when an application requires holding a substantial load safely at the fully extended position; if you need less force, the 100mm bore offers 3927N push at 0.5 MPa. Select the SAILF front-lock configuration when the rod-out position is the safety-critical state, and pick SAILB if the retracted position must be held instead. If your application requires clamping at an arbitrary mid-stroke point rather than the stroke end, choose the BSAI clamp-lock cylinder instead. Remember that the SAIL lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod.
When replacing this cylinder, match the 125mm bore, 100mm stroke, front locker position, PT port threads, and the -S magnet option. The cylinder supports the full ISO 15552 mounting interface set, including Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, and TCM2. For safe lock operation, never use a fast-exhaust valve, 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 elevated, add an independent mechanical safety measure as well.
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 SAILF125X100S FAQ
At 0.5 MPa, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, it provides up to 1251 kgf of push force.
The lock is spring-applied and air-released. It engages statically when the piston reaches the extended stroke end, holding the load 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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