Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 200mm 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
- Stroke200 mm
- Port sizeG1/2
- Lock positionFront cover
- Rod threadM27×2
- UnlockAir + manual
About the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S
The AirTAC SAILF125X200-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because the lock is spring-applied and air-released, cutting the release air drives a lock pin into the rod to securely hold the load at the extended stroke end without requiring live pressure. A carbon steel rod and a 1/2-inch PT port handle substantial thrust, delivering 6136 Newtons of push force at 0.5 MPa. The integrated -S magnet enables precise position tracking via CMSE reed or DMSE electronic solid-state sensors.
This model uses a variable air cushion at both ends, but the cushion at the locker end measures 24 mm, intentionally shorter than the 40 mm cushion on the free end to accommodate the locking mechanism. Remember that this cushion only decelerates the piston near the stroke terminal; the mechanical lock is what actually holds the load. For safety-critical vertical lifting applications, always add an independent safety measure alongside the cylinder lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAILF125X200S Is Used
Extended Lift Holding
Maintains a vertical load in the extended position during a power loss, utilizing the front cover lock to prevent sudden drops.
End-Stroke Clamping
Secures a workpiece firmly at the extended stroke terminal without needing continuous air pressure supplied to the cylinder.
Gate Safety Stop
Holds heavy safety gates or guards open at the end of the stroke, requiring an intentional air release signal to unlock.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X200S the Right Lock Cylinder?
Choose this 125 mm bore when a 100 mm bore falls short of the 3927 Newtons available at 0.5 MPa, or step down to a 100 mm bore if your application requires less than 6136 Newtons to save space. Select the SAILF configuration to hold the rod at the extended stroke end; choose SAILB if the load must be secured at the retracted end. If your process requires clamping at an arbitrary mid-stroke position rather than the stroke terminal, select the BSAI clamp-lock cylinder instead. This is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod.
When replacing this cylinder, verify the 125 mm bore, 200 mm stroke, front lock position, 1/2-inch PT port, and the -S magnet option. Avoid using a fast-exhaust valve with this lock cylinder; an independent-exhaust solenoid valve is required because back-pressure on the locker side can unintentionally release the lock. Although the 200 mm stroke is short enough to avoid guide issues, always ensure your mounting setup—whether Basic, TC, or LB—properly manages side loads.
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 SAILF125X200S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 Newtons of push force and 5734 Newtons of pull force. It can reach a maximum push force of 11045 Newtons at 0.9 MPa.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It provides a static hold after the cylinder stops, not a mid-stroke clamp or dynamic brake. Unlock it automatically via the release port or manually using the release lever.
Related AirTAC Lock & Standard Cylinders
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