Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 175mm 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
- Stroke175 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 SAILF40X175
The AirTAC SAILF40X175 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air pressure. In the 40mm bore class, it delivers a push force of 879N at 0.7 MPa, making it well-suited for lighter load-holding tasks.
The lock is statically applied after the cylinder stops, rather than acting as a dynamic brake for a moving rod. To accommodate the locking hardware, the variable air cushion at the front locker end is shorter (20mm) compared to the 27mm cushion at the rear free end. The unit uses a carbon steel rod and PT tapered port threads, and because no magnet is specified, it operates without position sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 175 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 SAILF40X175 Is Used
Vertical Lift Hold
Maintains an elevated load in the extended position automatically if air supply is lost, preventing sudden drops during power failures.
Pallet Stop Gate
Locks a diverter or stop gate in the rod-out position to hold pallets on a conveyor line securely without consuming continuous air.
Clamp and Hold
Extends to clamp a light workpiece and holds the pressure statically at the stroke end, ensuring the part remains fixed during machining.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175 the Right Lock Cylinder?
Choose this 40mm bore cylinder when you need to hold a load securely at the extended stroke end upon a loss of air pressure; if your application requires holding at the retracted rod-in position instead, select the SAILB40X175. For applications demanding mid-stroke clamping rather than end-of-stroke holding, the BSAI clamp-lock series is the correct choice. If you need higher force, stepping up to the 63mm bore provides 2182N of push force at 0.7 MPa.
When integrating this cylinder, avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the spring-applied lock; an independent-exhaust solenoid valve is required. For any safety-critical lifting application where human safety depends on the load staying extended, always add an independent mechanical safety measure beyond the pneumatic lock. Replacement units must match the 40mm bore, 175mm stroke, front locker position, PT port thread, and standard carbon steel rod.
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 SAILF40X175 FAQ
At 0.5 MPa, the push force is 628N and the pull force is 528N. At 0.7 MPa, the push force increases to 879N, and at 0.9 MPa it reaches 1130N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end. It provides a static hold after the rod stops, not a dynamic brake. You can unlock it automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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