Airtac SAILB Rear Lock Cylinder SAILB200X800
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X800 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 800mm 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.
- BoreØ200 mm
- Stroke800 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X800
The AirTAC SAILB200X800 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 automatically when the piston reaches the retracted stroke end, securely holding loads up to 15708N push at 0.5MPa without requiring live pressure. This power-loss safety mechanism is manually releasable and ideal for heavy vertical loads.
Unlike a mid-stroke clamp-lock, this static holding brake only engages at the stroke terminal. The 200mm bore uses a 3/4 PT port and a 40mm carbon steel rod. Note the locker end features a 28mm air cushion, shorter than the 50mm cushion on the free end, to physically accommodate the locking hardware.
Airtac SAILB Rear Lock Cylinder SAILB200X800 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X800 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 800 mm |
| Acting type | Double acting, with lock |
| Port size | G3/4 |
| Rod thread | M36×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (50 mm free end / 28 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 (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 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 SAILB200X800 Is Used
Vertical Load Holding
Secures heavy lifted masses safely in the retracted position during power loss or pressure drops.
Heavy Duty Clamping
Maintains high-force 15708N clamping pressure on large workpieces at the stroke end without continuous air consumption.
Safety Gate Locking
Provides a fail-safe mechanical stop for massive industrial safety gates and doors in the closed position.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X800 the Right Lock Cylinder?
Choose this 200mm bore for heavy loads requiring 15708N push at 0.5MPa; stepping down to a 160mm bore yields 10053N. Select SAILB to hold the rod in the retracted position, and SAILF to hold at the extended end. If your application requires locking at an arbitrary mid-stroke point, use the BSAI clamp-lock cylinder instead. This 800mm stroke exceeds typical compact lengths, so external guide shafts are recommended to prevent side-load wear on the seals. To replace, match bore, stroke, back locker position, PT ports, and add -S for CMSE or DMSE sensors. Avoid fast-exhaust valves; use an independent-exhaust solenoid valve to prevent back-pressure from releasing the lock.
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 SAILB200X800 FAQ
At 0.5MPa, the push force is 15708N and the pull force is 15080N. At 0.7MPa, the push force is 21991N. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released, engaging statically when the piston reaches the retracted stroke end. It is not a dynamic brake. Unlock by supplying release air or using the manual lever. Do not use fast-exhaust valves, as back-pressure can unintentionally release the lock.
Related AirTAC Lock & Standard Cylinders
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