Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X75S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X75S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM12×1.25
- 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 SAILF40X75S
The AirTAC SAILF40X75-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it carries the -S suffix, it includes a piston magnet for direct mounting of AirTAC CMSE reed switches or DMSE solid-state electronic sensors along the dual side grooves. A spring-applied, air-released lock engages when the piston reaches the extended stroke end, securely holding the rod out without relying on continuous live air pressure.
Within the 40mm bore class, this cylinder delivers 628N of push force at 0.5 MPa and 879N at 0.7 MPa. The variable air cushion at the front lock end is notably shorter at 20mm compared to the 27mm cushion on the free end. The lock itself is a static holding mechanism that engages after the rod stops, rather than a dynamic brake for a moving load.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X75S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X75S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 75 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 (27 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SAILF40X75S Is Used
Extended Load Holding
Secures vertical lifts in the rod-out position using the front mechanical lock, preventing sudden drops when air pressure is removed.
Power Failure Safety
Holds the extended stroke end safely during unexpected power or air loss, keeping gates and barriers open without live pressure.
Clamp and Hold
Maintains an extended clamping state on machined parts without consuming continuous air, releasing only when unlock air is supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X75S the Right Lock Cylinder?
Choose this 40mm bore when your application requires 879N of push force at 0.7 MPa; stepping down is not an option since SAIL cylinders do not come in a 32mm size, while a 50mm bore would increase output to 1374N. Select the SAILF configuration specifically when the load must be secured in the extended rod-out position; if you need to hold the retracted position, use SAILB instead. For locking at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is required.
To match this cylinder for a replacement, verify the 75mm stroke, front locker position, PT tapered port threads, and the -S magnet option. Avoid using fast-exhaust valves with this lock cylinder; an independent-exhaust solenoid valve is necessary because back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load remaining extended, add an independent safety measure.
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 SAILF40X75S FAQ
At 0.5 MPa, the 40mm bore generates 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The lock is spring-applied and air-released, engaging statically at the extended stroke end after the piston stops. It unlocks automatically via air supply to the release port or manually via the lever.
Related AirTAC Lock & Standard Cylinders
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