Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 300mm 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.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM16×1.5
- 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 SAILF50X300S
The AirTAC SAILF50X300-S is a double-acting ISO 15552 profile cylinder equipped with a mechanical lock in the front cover. It delivers 982N of push force at 0.5MPa and securely holds the rod at the extended stroke end. Because the lock is spring-applied and air-released, dropping the release air pressure automatically engages the pin to maintain the load without consuming live energy. You can unlock it by resupplying air to the release port or by using the manual release lever.
This bore 50 unit features a carbon steel rod, PT tapered port threads, and a magnetic piston for CMSE and DMSE switches. The variable air cushion at the locker end is 20mm, intentionally shorter than the 30mm cushion on the free end to accommodate the locking hardware. Remember that this static lock engages only after the cylinder stops; it will not brake a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 300 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable (30 mm free end / 20 mm lock end) |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILF50X300S Is Used
Extended Lift Holding
Maintains vertical lifts in the extended rod-out position during a power loss, preventing gravity-driven drops without needing continuous air pressure.
Actuator Stop Position
Locks a conveyor diverter or gate firmly at the extended stroke end to ensure materials route correctly even if the main air supply fluctuates.
Safety Gate Lock
Secures a machine safety gate in the open, extended position. The spring-applied lock engages automatically upon air loss to protect operators.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300S the Right Lock Cylinder?
Choose this front-lock model (SAILF) when your application requires the load to be held securely in the extended rod-out position. If you need to hold the retracted position, select the SAILB variant instead. For applications requiring the load to be clamped at an arbitrary mid-stroke point, the BSAI clamp-lock cylinder is the correct choice. Stepping up to a bore 63 cylinder increases push force to 1559N at 0.5MPa, while dropping to a bore 40 reduces it to 628N.
Because this unit has a 300mm stroke, ensure adequate external guide support to prevent side-loading damage to the rod seals. The lock holds statically at the stroke terminal, so never use a fast-exhaust valve with this cylinder; back-pressure on the locker side can unintentionally release the lock. Always use an independent-exhaust solenoid valve, and add an independent mechanical safety measure if human safety depends on the load staying elevated.
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 SAILF50X300S FAQ
At 0.5MPa operating pressure, this bore 50 cylinder provides 982N of push force and 825N of pull force. At 0.7MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, holding the rod securely at the extended stroke end. It engages automatically when air pressure is cut and releases via air supply or a manual lever. It is a static hold only, not a mid-stroke clamp or dynamic brake.
Related AirTAC Lock & Standard Cylinders
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