Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X450S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X450S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 450mm 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
- Stroke450 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 SAILF125X450S
The AirTAC SAILF125X450-S is a double-acting ISO 15552 profile cylinder equipped with a mechanical lock in the front cover, designed to secure the rod at the extended stroke end. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm carbon steel rod and a 1/2-inch PT port. The integrated lock is spring-applied and air-released, meaning it engages automatically to hold the load when release air is cut off, preventing drops during a power loss.
Unlocking is achieved by supplying air to the release port for automatic operation, or by using the manual release lever. The -S suffix indicates a built-in magnet compatible with AirTAC CMSE reed and DMSE electronic solid-state sensors for precise position detection. Note that the variable air cushion at the locker end is 24mm, intentionally shorter than the 40mm cushion at the free end to accommodate the locking mechanism.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X450S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X450S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAILF125X450S Is Used
Extended Load Holding
Secures vertical lifts and elevated platforms in the extended position, using the spring-applied lock to prevent gravity-induced drops during air pressure loss.
Pallet Stop Gate
Holds a conveyor pallet at the rod-out end of stroke securely without consuming live air, maintaining a firm barrier until the air-release port is pressurized.
Clamp and Hold
Maintains outward clamping force on heavy workpieces at the extended stroke terminal, ensuring the part stays fixed even if the main air supply is interrupted.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X450S the Right Lock Cylinder?
Choose this 125mm bore when the 5734N pull force at 0.5MPa from a smaller 100mm bore is insufficient, or step down to it if an 80mm bore provides excessive force. Select the SAILF front-locker variant when the load must be held securely at the rod-out position; choose SAILB if the retracted position requires holding. If your application demands clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct choice instead.
The lock is a static holding device that engages only 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 unintentionally release the lock; always use an independent-exhaust solenoid valve. For safety-critical lifting applications, add an independent mechanical safety measure. With a 450mm stroke, ensure external guide rails are used to manage side loads and prevent rod binding. Replacement matches require identical bore, stroke, front locker position, PT port, and mounting style.
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 SAILF125X450S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. The maximum push force reaches 11045N at 0.9MPa.
The lock is spring-applied and air-released, holding the rod securely at the extended stroke end without live pressure. To unlock, supply air to the release port for automatic operation or use the manual release lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X450S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.