Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X350S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 350mm 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
- Stroke350 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 SAILF125X350S
The AirTAC SAILF125X350-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 carbon steel rod, securely holding the load at the extended stroke end without requiring live pressure. In the 125mm bore class, it generates 6136N of push force and 5734N of pull force at 0.5 MPa.
This unit includes a magnet for position sensing with AirTAC CMSE reed and DMSE electronic switches. The variable air cushion at the locker end is 24mm, intentionally shorter than the 40mm cushion on the free end to accommodate the locking hardware. The lock is a static holding device that engages after the piston stops; it is not a mid-stroke clamp or a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAILF125X350S Is Used
Extended Lift Holding
Secures a vertical lift in the rod-out position during a power loss, preventing gravity-driven drops until air is restored.
Clamp and Hold
Maintains machining clamping force at the extended stroke end without continuously consuming compressed air.
Gate Safety Lock
Keeps heavy safety gates locked open at the stroke terminal, requiring an active air signal to release and close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350S the Right Lock Cylinder?
Choose this 125mm bore if your application requires the 6136N thrust at 0.5 MPa, stepping down to the 80mm bore (2513N push) for lighter vertical lifts, or up to the 160mm bore (10053N push) for heavier assemblies. Select the SAILF configuration when the load must be secured in the extended rod-out position; choose SAILB to hold the retracted position. If your machine requires the load to be clamped at an arbitrary mid-stroke point rather than a stroke end, select the BSAI clamp-lock cylinder instead.
For a 350mm stroke, using a side-load guide or external rail is recommended to prevent rod bending and premature seal wear. To maintain lock integrity, never use a fast-exhaust valve, as back-pressure on the locker side can accidentally release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load staying extended, add an independent mechanical safety measure as a backup. Replacement matches require the exact 125mm bore, 350mm stroke, front locker position, PT 1/2 port, and -S magnet.
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 SAILF125X350S FAQ
At 0.5 MPa operating pressure, the 125mm bore provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force is 8590N, and at 0.9 MPa, it reaches 11045N.
The lock is spring-applied and air-released, holding the rod securely at the extended stroke end when air is cut off. It is a static hold that engages after the cylinder stops, not a mid-stroke clamp. Unlocking is automatic via air supply to the release port or via a manual release lever.
Related AirTAC Lock & Standard Cylinders
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