Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 900mm 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
- Stroke900 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 SAILF125X900
The AirTAC SAILF125X900 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because it is a SAILF variant, the lock engages to hold the rod securely at the extended stroke end. 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 vertical lifting tasks.
This model features a carbon steel rod and PT tapered port threads. A critical design detail is that the variable air cushion at the locker end is shorter (24mm) than the free end (40mm). The lock itself is a static holding device that engages only after the piston stops at the stroke terminal; it is not a dynamic brake for a moving rod. To unlock, you supply air to the release port for automatic operation or use the manual release lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAILF125X900 Is Used
Vertical Lift Holding
Secures heavy elevated loads in the extended position during a power loss, preventing sudden drops in lifting rigs.
Safety Gate Lock
Keeps heavy machine safety gates firmly open and locked at the full stroke end until the release air is actively supplied.
Heavy Clamp and Hold
Maintains constant clamping pressure on large fabricated parts at the end of the stroke without consuming continuous compressed air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900 the Right Lock Cylinder?
Choose this 125mm bore when a 100mm cylinder lacks sufficient thrust (delivering 3927N push at 0.5 MPa) and a 160mm unit is excessive. The SAILF configuration is specifically selected when the application requires the load to be held at the extended rod-out position. If your process instead requires clamping at an arbitrary mid-stroke point, you must select a BSAI clamp-lock cylinder instead of this stroke-end-only model.
Because this unit has a 900mm stroke, mounting it requires careful guidance to prevent excessive side-loading on the carbon steel rod; always use external guide rails to support the load. Remember that the lock holds the load without live air pressure, but you must never use a fast-exhaust valve with this cylinder. Use an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load staying extended, 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 SAILF125X900 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, located in the front cover to hold the rod only at the extended stroke end. It engages statically after the cylinder stops and is released automatically via air pressure or manually via a lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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