The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X175S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 175mm 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.
The AirTAC SAILF125X175-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock in the front cover. This mechanism engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air pressure. Delivering 6136N of push force at 0.5 MPa, it features a carbon steel rod and a built-in magnet for CMSE reed and DMSE electronic sensors.
Because the lock occupies the front cover, the variable air cushion on that locker end is shorter at 24mm compared to the 40mm cushion on the free end. The lock is a static holding device that engages after the cylinder stops; it is not a dynamic brake for a moving rod. You can release the lock automatically by supplying air to the release port or by using the manual release lever.
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X175S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 175 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.
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.
| 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.
Maintains elevated loads in the rod-out position during a power loss, using the mechanical lock to prevent unintended retraction.
Secures heavy safety gates or guarding in the open extended position until the release air is actively supplied.
Drives a clamping fixture to the extended stroke end and holds the workpiece firmly without consuming continuous pneumatic energy.
Choose this 125mm bore when an application requires robust end-of-stroke holding at the extended position, stepping up from an 80mm bore that provides 2513N push at 0.5 MPa. Select the SAILF front-locker variant when the rod-out position must be maintained on power loss, and pick SAILB if the retracted position needs holding. If your application requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, use the BSAI clamp-lock cylinder instead.
For safe operation, do not use a fast-exhaust valve with this cylinder; back-pressure on the locker side can inadvertently release the lock, so an independent-exhaust solenoid valve is required. If human safety depends on the load staying extended, add an independent safety measure. When replacing this unit, match the 125mm bore, 175mm stroke, front locker position, PT tapered port threads, and the -S magnet option.
Quick checklist
At 0.5 MPa, this 125mm bore cylinder 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, located in the front cover to hold the rod only at the extended stroke end. It engages statically after the cylinder stops and is released automatically via air pressure or manually via a lever.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.