Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 80mm 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
- Stroke80 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 SAILF40X80
The AirTAC SAILF40X80 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 automatically engages a lock pin to hold the rod securely at the extended stroke end without requiring live pressure. Supplying air to the release port unlocks it automatically, or you can use the manual release lever.
This 40mm bore generates 879N of push force at 0.7 MPa and operates at speeds between 30 and 800 mm/s. A unique design detail is that the variable air cushion at the locker end is only 20mm, which is shorter than the 27mm cushion on the non-locking end. The standard carbon steel rod handles side loads well, and optional sensors like reed-based CMSE or solid-state DMSE switches can be added if a magnet is specified.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAILF40X80 Is Used
Vertical Lift Hold
Secures elevated loads at the extended stroke end automatically upon air pressure loss, preventing sudden drops.
Pallet Stop Gate
Locks a diverter or stopper pin in the extended position to halt pallets on a packaging line without consuming continuous air.
Safety Guard Lock
Holds a machine safety door open at the end of stroke until the release air is actively commanded.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80 the Right Lock Cylinder?
Select this 40mm bore when your application requires holding a load at the rod-out position; choose the SAILB variant instead if you need the load held at the retracted stroke end. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct choice. Stepping up to a 50mm bore increases push force to 1374N at 0.7 MPa, while dropping below 40mm is not available in the SAIL series.
Remember that the SAIL lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required. For safety-critical lifting applications, always add an independent mechanical safety measure. Replacement matches require 40mm bore, 80mm stroke, front locker position, PT tapered ports, and an ISO 15552 mounting interface.
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 SAILF40X80 FAQ
The 40mm bore provides a push force of 879N at 0.7 MPa and 1130N at 0.9 MPa, with a pull force of 528N at 0.5 MPa. The maximum operating pressure is 1.0 MPa.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end. It holds statically after stopping and is released by supplying air to the release port or using the manual lever.
Related AirTAC Lock & Standard Cylinders
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