Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X800S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 800mm 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
- Stroke800 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 SAILF125X800S
The AirTAC SAILF125X800-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock in the front cover. Because the lock resides in the front end, it securely holds the rod at the extended stroke-end position. It delivers a robust 6136N push force at 0.5 MPa, making it well-suited for heavy vertical lifting tasks. The integrated -S magnet enables precise position sensing with AirTAC CMSE reed and DMSE solid-state switches.
This unit features a 32mm carbon steel rod and PT tapered ports. A critical design detail is that the variable air cushion at the locker end is only 24mm, intentionally shorter than the 40mm cushion on the free end to accommodate the locking hardware. The lock itself is a static holding device that engages only after the piston fully stops at the stroke terminal, meaning it will not arrest a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAILF125X800S Is Used
Overhead Lift Hold
Secures elevated heavy masses in the extended position instantly upon air pressure loss, preventing sudden drops on vertical lifting rigs.
Pallet Stop Gate
Locks a heavy pallet stop block in the extended out position to halt 125mm-class loads without relying on continuous air supply.
Safety Barrier Arm
Maintains a protective machine guard fully extended and mechanically locked during power loss or emergency stop events.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X800S the Right Lock Cylinder?
Choose this 125mm bore when 80mm bore cylinders fall short of the 2513N push force at 0.5 MPa, or step up to a 160mm bore if your application requires the 10053N thrust class. Select the SAILF configuration specifically when the load must be secured in the extended rod-out position; choose SAILB instead if your safety requirement holds the load retracted. If your process demands locking at an arbitrary mid-stroke point rather than a stroke-end terminal, the AirTAC BSAI clamp-lock cylinder is the correct choice.
At 800mm of travel, this cylinder is at the maximum standard stroke limit for this bore, so utilizing external guide rails to prevent side-load damage is highly recommended. The lock holds the load without live pressure, but back-pressure on the locker side can unintentionally release it—therefore, do not use a fast-exhaust valve and always employ an independent-exhaust solenoid valve. For human-safety critical overhead lifting, add an independent mechanical safety measure beyond the pneumatic lock. Replacement requires matching the 125mm bore, 800mm stroke, front locker position, PT ports, and -S magnet.
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 SAILF125X800S FAQ
At 0.5 MPa, it provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The lock is spring-applied and air-released. It engages automatically to hold the rod statically at the extended stroke end when pressure is cut. To unlock, supply release air or use the manual override lever.
Related AirTAC Lock & Standard Cylinders
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