Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X700S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X700S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 700mm 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
- Stroke700 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 SAILF125X700S
The AirTAC SAILF125X700-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is an F-type unit, the spring-applied, air-released lock engages only when the piston reaches the extended stroke end, rigidly holding the rod-out position. Operating within a 30-500 mm/s speed range, this bore 125 unit generates 6136N of pull force at 0.5 MPa, making it well suited for heavy load control.
The integrated lock provides a static hold without requiring live pressure, functioning distinctly from the variable air cushion which merely decelerates the piston near the stroke terminus. Notably, the cushion at the locker end measures 24 mm, which is shorter than the 40 mm cushion found on the free end. Equipped with a standard carbon steel rod and a magnetic piston, this variant directly supports AirTAC CMSE reed and DMSE solid-state electronic sensors for precise end-of-stroke detection.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X700S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X700S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAILF125X700S Is Used
Extended Stroke Safety Hold
Secures vertical lifts and elevated platforms in the rod-out position during a power loss, keeping heavy loads safely suspended without relying on continuous air pressure.
End-of-Stroke Material Stop
Locks a conveyor diverter or heavy-gauge material stop firmly in the extended terminal position, preventing movement caused by product impact or vibration.
Machine Guard Positioning
Holds a heavy machine safety door or guard open at the end of its stroke, ensuring the barrier remains reliably extended until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X700S the Right Lock Cylinder?
Selecting this specific model means prioritizing safety at the rod-out position, whereas a SAILB variant of the same size would hold the retracted end. If your mechanism requires the load to be clamped at an arbitrary mid-stroke point rather than at the extended terminal, the AirTAC BSAI clamp-lock cylinder is the correct choice instead. Stepping down to a bore 100 cylinder reduces the push force to 3927N at 0.5 MPa, while upgrading to a bore 160 unit increases it to 10053N.
Because the stroke is 700 mm, incorporating an external guide mechanism is strongly recommended to prevent excessive side-load wear on the rod seals. The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. To prevent back-pressure from accidentally lifting the lock, avoid fast-exhaust valves and use an independent-exhaust solenoid valve. For human safety applications, always add an independent mechanical safety measure. Replacement requires matching the 125 mm bore, 700 mm stroke, front locker position, 1/2-inch PT port, and the -S magnet option.
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 SAILF125X700S FAQ
At 0.5 MPa operating pressure, this bore 125 cylinder provides 6136N of push force and 5734N of pull force. If operated at 0.7 MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, engaging automatically to hold the rod at the extended stroke end when pressure is cut. To unlock it, you supply air to the release port or use the manual release lever. It is a static hold only, not a mid-stroke clamp or dynamic brake.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X700S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.