Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 500mm 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.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Lock positionFront cover
- Rod threadM27×2
- 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 SAILF125X500
The AirTAC SAILF125X500 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This safety mechanism engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring live air pressure. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm carbon steel rod and a 1/2-inch PT port.
Because the lock occupies the front end, the variable air cushion on that side is shorter at 24mm compared to 40mm on the free end. The lock releases automatically via air supply or manually via a lever, but avoid fast-exhaust valves; back-pressure on the locker side can inadvertently release the lock. Position sensing requires a magnet, but this standard unit ships without one.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 500 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (40 mm free end / 24 mm lock end) |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 SAILF125X500 Is Used
Extended Lift Holding
Secures vertical lifts in the rod-out position during power loss, preventing gravity-driven drops.
Safety Gate Lock
Holds heavy safety gates open at full extension until an air signal deliberately releases the lock.
Clamp and Hold
Maintains clamping force on large parts at the stroke end without consuming continuous air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500 the Right Lock Cylinder?
Choose this 125mm bore when 80mm falls short (80mm yields 2513N push at 0.5MPa) and 160mm is excessive (160mm yields 10053N). Select the SAILF configuration specifically when the load must be secured at the extended rod-out position; opt for SAILB if holding the retracted position is required. If your application demands clamping at an arbitrary mid-stroke point, use the BSAI clamp-lock cylinder instead, as this lock functions only at the stroke terminal.
For this 500mm stroke model, add external guide rails to counter side-load risks on the 32mm rod. Ensure an independent-exhaust solenoid valve is used to prevent back-pressure from lifting the lock. For replacement, match the 125mm bore, 500mm stroke, front locker, PT port threads, and desired mounting from the Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, TCM2 set. If human safety relies on the load staying elevated, add an independent mechanical 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 SAILF125X500 FAQ
At 0.5MPa, it provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, engaging only when the rod reaches the extended stroke end. It unlocks automatically via air supply or manually via a lever, but it cannot hold the rod at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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