Airtac SAILB Rear Lock Cylinder SAILB100X175
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X175 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 175mm 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
- Stroke175 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 SAILB100X175
The AirTAC SAILB100X175 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the back cover. It securely holds the rod at the retracted stroke end, meaning the load stays put without live air pressure. In the 100mm bore class, it generates 3927N of push force and 3681N of pull force at 0.5 MPa, peaking at 801 kgf at 1.0 MPa.
The lock engages only after the piston stops at the retracted terminal, acting as a static holding device rather than a dynamic brake. While the variable air cushion decelerates the rod near the end of travel, the lock provides the actual holding power. Note that the cushion at the locker end is shorter (24mm) compared to the free end (36mm). The carbon steel rod uses an M20x1.5 thread, and the 1/2-inch PT port handles pneumatic flow at speeds from 30-800 mm/s.
Airtac SAILB Rear Lock Cylinder SAILB100X175 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X175 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 175 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 SAILB100X175 Is Used
Vertical Lift Holding
Prevents heavy elevators or lifting platforms from crashing down when air supply is cut, locking the load securely at the fully retracted bottom position.
Clamp and Hold
Maintains high-pressure clamping force on a workpiece at the end of the stroke during machining operations, ensuring zero movement even if plant air drops.
Safety Gate Locking
Secures heavy safety gates or machinery guards in the closed retracted position, requiring an active air signal to release the lock and allow opening.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X175 the Right Lock Cylinder?
Select this 100mm bore when 50mm (982N push at 0.5 MPa) is insufficient for your load, but the 125mm bore (6136N) would be excessive. Choose the SAILB configuration because your application requires the load to be held safely at the retracted rod-in position. If your process requires clamping at an arbitrary mid-stroke point, you must select the BSAI clamp-lock cylinder instead.
For safe operation, never use a fast-exhaust valve with this lock cylinder; always use an independent-exhaust solenoid valve to prevent back-pressure on the locker side from accidentally releasing the lock. If human safety depends on the load remaining retracted, add an independent mechanical safety measure. To replace this unit, match the 100mm bore, 175mm stroke, back locker position, 1/2-inch PT port, and your required mounting style (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, or TCM2).
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 SAILB100X175 FAQ
At a standard operating pressure of 0.5 MPa, the SAILB100X175 provides 3927N of push force and 3681N of pull force. At its maximum rated pressure of 1.0 MPa, it delivers a maximum push force equivalent to 801 kgf.
The lock is spring-applied and air-released, located in the back cover to hold the rod securely at the retracted stroke end. It engages automatically as a static hold once the piston stops, and is unlocked by supplying air to the release port or by using the manual release lever. It is not a mid-stroke clamp.
Related AirTAC Lock & Standard Cylinders
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