Airtac SAILB Rear Lock Cylinder SAILB100X700
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X700 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 700mm 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
- Stroke700 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 SAILB100X700
The AirTAC SAILB100X700 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This mechanism engages automatically to secure the rod at the retracted stroke end whenever release air is cut, ensuring heavy loads remain safely held without consuming live pressure. It delivers a robust 3927N of push force at 0.5MPa, utilizing a 25mm carbon steel rod and a 1/2 inch PT port.
Unlike a standard SAI unit, this model provides true power-loss safety, though the lock engages only at the stroke terminal rather than clamping at an arbitrary mid-stroke position. The variable air cushion at the locker end is notably shorter at 24mm compared to 36mm on the free end, a necessary design accommodation for the locking hardware. Furthermore, the lock releases automatically via air supply or manually via a lever, but requires careful valve selection to avoid accidental disengagement.
Airtac SAILB Rear Lock Cylinder SAILB100X700 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X700 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 700 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 SAILB100X700 Is Used
Vertical Lift Power-Loss Safety
Secures elevated platforms or heavy vertical lifts in the retracted position instantly if air pressure drops, preventing uncontrolled descent.
Heavy Pallet Holding
Holds a retracted stopper block firmly in place against conveyor pallet impact without requiring continuous live air pressure.
Machine Guard Gate Lock
Keeps a heavy safety gate retracted and locked open during machine operation, releasing only when the control system supplies unlock air.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X700 the Right Lock Cylinder?
Select this 100mm bore when an application demands substantial load-holding at the retracted position that a plain SAI cannot provide; stepping down to an 80mm bore drops the 0.5MPa push force to 2513N, while upgrading to 125mm increases it to 6136N. Choose SAILB for back-cover retracted holding, or SAILF if the extended rod-out position must be secured. If your process requires clamping at any intermediate mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct alternative.
Because this unit features a 700mm stroke, external guide rails are strongly recommended to prevent excessive side-loading on the 25mm rod and to preserve seal integrity. The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for moving rods. Crucially, do not use a fast-exhaust valve with this cylinder; back-pressure on the locker side can lift the lock, so an independent-exhaust solenoid valve is mandatory. For any human-safety critical lifting application, always add an independent mechanical safety measure beyond the lock. Replacement specifications must match the 100mm bore, 700mm stroke, back locker position, PT port threads, and standard mounting interfaces.
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 SAILB100X700 FAQ
At 0.5MPa operating pressure, this 100mm bore cylinder provides 3927N of push force and 3681N of pull force. At 0.7MPa, the push force increases to 5497N.
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 statically after the rod stops and is released automatically via air supply or manually via a lever; it does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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