Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm 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.
- BoreØ125 mm
- Stroke75 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 SAILF125X75
The AirTAC SAILF125X75 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 drives a lock pin into the rod, securely holding the load at the extended stroke end without consuming live pressure. In this 125mm bore class, it generates a substantial 6136N of push force and 5734N of pull force at 0.5MPa, making it ideal for heavy-duty holding tasks.
This model features a carbon steel rod and PT tapered port threads. The variable air cushion at the locker end is specifically designed at 24mm, which is shorter than the 40mm cushion on the non-locker end, ensuring compact deceleration without interfering with the locking mechanism. For position sensing, adding the -S magnet option enables compatibility with AirTAC CMSE reed and DMSE electronic sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAILF125X75 Is Used
Vertical Lift Hold
Maintains elevated heavy loads at the extended stroke end during power loss, preventing sudden drops.
Safety Gate Barrier
Keeps protective gates and barriers firmly extended and locked without needing continuous air supply.
End-of-Stroke Clamp
Secures heavy workpieces at the full extension point for machining operations that demand zero movement.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75 the Right Lock Cylinder?
Choose this 125mm bore when you need robust holding power at the extended end; if your application requires less force, the 100mm bore offers 3927N of push at 0.5MPa. Select the SAILF configuration to lock the rod in the extended position, whereas a SAILB variant would hold the retracted position. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, you must use the BSAI clamp-lock cylinder instead.
Remember that the SAIL lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. For safety-critical suspended loads, implement an additional independent safety measure. Replacement matches require the exact 125mm bore, 75mm stroke, front locker position, PT ports, and standard mountings like TC or LB.
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 SAILF125X75 FAQ
At 0.5MPa, this 125mm bore cylinder 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, holding the rod securely at the extended stroke end without live pressure. It unlocks automatically by supplying air to the release port or manually via the lever, but it cannot clamp at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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