Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X75
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X75 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 75mm 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
- Stroke75 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 SAILF50X75
The AirTAC SAILF50X75 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the front cover. This lock engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring live pressure. Delivering 982N of push force at 0.5 MPa, it uses a 20mm carbon steel rod and a 1/4 PT port.
The lock is a static holding device, not a dynamic brake for a moving rod. A key design detail is that the variable air cushion at the locker end is 20mm, which is shorter than the 30mm cushion on the free end. The lock releases automatically via air supply or manually via a lever, but you must avoid fast-exhaust valves; back-pressure on the locker side can unintentionally release the lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X75 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X75 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAILF50X75 Is Used
Vertical Lift Safety
Holds a raised load securely at the extended stroke end during a power loss, preventing sudden drops in lifting jigs.
End-of-Stroke Clamp
Maintains a clamping force at the full rod-out position without consuming continuous air pressure.
Gate Hold Mechanism
Keeps heavy safety gates or doors locked open at the end of the stroke until the release air is supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X75 the Right Lock Cylinder?
Choose this 50mm bore when you need 982N of thrust at 0.5 MPa, stepping up from the 40mm bore's 628N, or down from the 63mm bore's 1559N. Select the SAILF configuration to hold the load at the extended stroke end, whereas SAILB holds at the retracted end. If your application requires locking at an arbitrary mid-stroke position, use the BSAI clamp-lock cylinder instead.
Because the lock holds statically only at the stroke terminal, use an independent-exhaust solenoid valve to prevent back-pressure from lifting the lock. For any safety-critical load that must stay up during a power loss, add an independent safety measure. When replacing this unit, match the 75mm stroke, front locker position, PT thread, and mounting style; note that no magnet is specified, so CMSE or DMSE sensors cannot be used without modification.
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 SAILF50X75 FAQ
At 0.5 MPa, the 50mm bore provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, holding the rod statically at the extended stroke end. It unlocks automatically when air is supplied to the release port, or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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