Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X50S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X50S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 50mm 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
- Stroke50 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 SAILF125X50S
The AirTAC SAILF125X50-S is a double-acting ISO 15552 profile cylinder equipped with a mechanical lock in the front cover, designed to securely hold the rod at the fully extended stroke end. Built with a carbon steel rod and a PT tapered port, it delivers a robust 6136N push force at 0.5 MPa. A spring-applied, air-released mechanism ensures the load remains safely locked whenever release pressure is lost, functioning automatically via air supply or a manual override lever.
Because the lock engages only at this specific stroke terminal, it is not a dynamic brake for a moving rod nor a mid-stroke clamp. The integrated magnet enables position sensing with AirTAC CMSE reed or DMSE solid-state switches. Note that the variable air cushion at the locker end measures 24mm, which is intentionally shorter than the 40mm cushion on the free end to accommodate the locking hardware.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X50S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X50S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAILF125X50S Is Used
Extended Lift Holding
Maintains vertical loads in the raised extended position during a sudden air pressure loss, preventing crashes without needing continuous live air.
Out-Stroke Clamp
Secures a workpiece at the end of the forward stroke, keeping the part firmly clamped while machine operations occur.
Safety Gate Lock
Holds a heavy safety barrier open at the full stroke end until the control system actively commands retraction via the air release.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X50S the Right Lock Cylinder?
Select this 125mm bore model when an application demands high thrust and guaranteed load holding at the rod-out position. If your system requires less force, stepping down to an 80mm bore yields 2513N of push force at 0.5 MPa; conversely, moving up to a 160mm bore provides 10053N for heavier payloads. Choose this SAILF variant specifically to secure the extended position, whereas a SAILB version would hold the retracted stroke end. If your design requires clamping at an arbitrary mid-stroke point rather than the terminal end, the BSAI clamp-lock cylinder is the correct alternative.
For safe operation, never pair this unit with a fast-exhaust valve; use an independent-exhaust solenoid valve because back-pressure on the locker side can unintentionally release the lock. The lock provides a static hold after the cylinder stops, so if human safety depends on the load remaining extended, add an independent safety measure. Replacement matches require the exact 50mm stroke, front locker position, PT port, and the -S magnet option.
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 SAILF125X50S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If operated at the maximum 1.0 MPa pressure, the push force reaches 1251 kgf.
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 rod stops, not a dynamic brake, and can be unlocked automatically via air supply or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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