Airtac SAILB Rear Lock Cylinder SAILB100X50S
The AirTAC SAILB Rear Lock Cylinder SAILB100X50S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 50mm 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
- Stroke50 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 SAILB100X50S
The AirTAC SAILB100X50-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. Because the lock is spring-applied and air-released, cutting the release air automatically drives a lock pin into the rod, holding the load securely at the retracted stroke end without requiring live pressure. In this 100mm bore class, the cylinder generates 5497N of push force at 0.7 MPa, making it well-suited for heavy vertical loads. To unlock the rod, you simply supply air to the release port for automatic operation or use the manual release lever.
This model includes a standard magnet for position sensing, working seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches fitted into the barrel's dual sensor grooves. A critical design detail is that the variable air cushion at the locker end is notably shorter at 24mm compared to the 36mm cushion on the free end. Furthermore, the lock is a static holding device that engages only after the piston stops at the stroke terminal; it is not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB100X50S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X50S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 50 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 SAILB100X50S Is Used
Vertical Power-Off Safety
Holds heavy lifted loads in the retracted position instantly when air pressure drops, preventing sudden crashes.
Machine Guard Hold
Secures a safety gate or guard in the retracted closed position without consuming continuous compressed air.
Clamp and Secure
Maintains a firm retracted clamping state on a workpiece during machining cycles or brief line stoppages.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X50S the Right Lock Cylinder?
Choose this 100mm bore if you need the 5497N push force at 0.7 MPa for your load; if your application requires less force, stepping down to an 80mm bore yields 3518N, whereas moving up to 125mm provides 8590N. Select the SAILB configuration when the load must be held safely in the retracted position upon power loss, and choose SAILF if the extended end must be secured. If your machine requires clamping at an arbitrary mid-stroke point rather than the stroke end, you must use the BSAI clamp-lock cylinder instead.
For safe operation, never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. If human safety depends on the load staying retracted, add an independent safety measure as well. When replacing this unit, match the 100mm bore, 50mm stroke, back locker position, 1/2-inch PT port, and the -S magnet option. The carbon steel rod handles standard side loads, and the full ISO 15552 mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, TCM2) is supported.
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 SAILB100X50S FAQ
The 100mm bore generates 3927N of push force and 3681N of pull force at 0.5 MPa. At 0.7 MPa, the push force is 5497N, and it reaches 7068N at 0.9 MPa.
The lock is spring-applied and air-released, meaning it engages automatically at the retracted stroke end when release air is cut off. It is a static hold that engages after the cylinder stops, not a mid-stroke clamp or dynamic brake; use the manual release lever or supply release air to unlock it.
Related AirTAC Lock & Standard Cylinders
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