Airtac SAILB Rear Lock Cylinder SAILB100X125
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 125mm stroke and a built-in spring-applied, air-released mechanical lock in the back cover — it holds the load at the retracted (rod-in) stroke end even when air is lost.
- BoreØ100 mm
- Stroke125 mm
- Port sizeG1/2
- Lock positionBack cover
- Rod threadM20×1.5
- 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 SAILB Rear Lock Cylinder SAILB100X125
The AirTAC SAILB100X125 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. A spring-applied, air-released lock engages when the piston reaches the retracted stroke end, safely holding a load without relying on live air pressure. You can unlock it automatically by supplying air to the release port or by using the manual release lever. In the 100 mm bore class, this actuator delivers 3927 N of push force at 0.5 MPa and up to 7068 N at 0.9 MPa.
Because the lock mechanism occupies end-cover space, the variable air cushion at the locker end is 24 mm, which is shorter than the 36 mm cushion found on the non-locking front end. The extruded aluminum barrel includes dual sensor grooves for mounting CMSE reed or DMSE electronic solid-state switches, though this specific SKU is supplied without a magnet. The carbon steel rod and M20x1.5 rod thread provide robust side-load resistance for heavy industrial handling.
Airtac SAILB Rear Lock Cylinder SAILB100X125 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 125 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| Lock type | Spring-applied, air-released (back cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable (36 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 retracted (rod-in) 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 back-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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SAILB Rear Lock Cylinder SAILB100X125 Is Used
Vertical Lift Holding
Prevents gravity-loaded vertical platforms from dropping when air pressure is lost, securing the load safely at the retracted stroke end.
Power Failure Safety
Maintains a clamp or guard in a safe position during an unexpected plant air shutdown, requiring release air to move.
Heavy Fixture Locking
Holds heavy workpieces or industrial fixtures firmly in place inside machinery at the end of the stroke without consuming continuous air.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X125 the Right Lock Cylinder?
Select this 100 mm bore model when an application requires substantial thrust, such as 5497 N push at 0.7 MPa, combined with fail-safe load holding at the retracted position. If your force requirements are lower, stepping down to an 80 mm bore yields 2513 N push at 0.5 MPa, whereas a 125 mm bore provides 6136 N if you need greater capacity. Choose SAILB to secure the rod-in position; if the extended rod-out position must be held instead, select the SAILF variant. For applications needing the load locked at an arbitrary mid-stroke point rather than a stroke end, the AirTAC BSAI clamp-lock cylinder is the correct choice.
Remember that this unit is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves with this actuator, as back-pressure on the locker side can unintentionally release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load remaining suspended, add an independent safety measure beyond the pneumatic lock. To replace this unit, match the 100 mm bore, 125 mm stroke, back locker position, PT port threads, and your required mounting style.
Quick checklist
- ✓ Hold needed at the retracted (rod-in) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILB Rear Lock Cylinder SAILB100X125 FAQ
The 100 mm bore generates 3927 N of push force and 3681 N of pull force at 0.5 MPa. At 0.9 MPa, the push force increases to 7068 N.
The spring-applied lock engages automatically at the retracted stroke end when air is cut off, holding the load without live pressure. It is released by supplying air to the release port or via the manual lever, but it only holds at the stroke end, not mid-stroke.
Related AirTAC Lock & Standard Cylinders
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