Airtac SAILB Rear Lock Cylinder SAILB100X125S
The AirTAC SAILB Rear Lock Cylinder SAILB100X125S 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 SAILB100X125S
The AirTAC SAILB100X125-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock in the back cover. Because the lock resides in the back end, it securely holds the rod at the fully retracted stroke-end position. The bore delivers 3927N of push force and 3681N of pull force at 0.5 MPa, making it a robust choice for heavy vertical loads. The -S suffix indicates an integrated magnet compatible with CMSE reed and DMSE electronic sensors for precise position tracking.
This model uses a standard carbon steel rod and features a 1/2 PT port. A critical design detail is that the variable air cushion at the locker end is shorter (24mm) than the free end cushion (36mm). 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 SAILB100X125S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X125S |
|---|---|
| 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 SAILB100X125S Is Used
Vertical Load Holding
Maintains heavy lifted loads in the retracted position during power loss, utilizing the spring-applied lock to secure the rod without requiring live air pressure.
Safety Gate Interlock
Secures safety gates or heavy access panels in the closed position, engaging the mechanical lock only after the piston reaches the back stroke end.
Clamp and Hold Fixture
Provides high-force clamping at the end of the stroke, holding the workpiece securely in place while machining operations are performed.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X125S the Right Lock Cylinder?
Choose this 100mm bore when 80mm (2268N pull at 0.5 MPa) is insufficient to hold your load safely, or step down to 80mm if 3681N pull force is excessive for your application. Select this SAILB variant when the load must be secured in the retracted position. If your application requires locking at an arbitrary mid-stroke point, select the BSAI clamp-lock cylinder instead. For any safety-critical load holding, always add an independent mechanical safety measure.
When specifying this model, confirm the 100mm bore, 125mm stroke, back locker position, 1/2 PT port, and the -S magnet option. It supports the full ISO 15552 mounting interface set including Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, and TCM2. Valve selection is critical: do not use a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock; use an independent-exhaust solenoid valve instead.
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 SAILB100X125S FAQ
At 0.5 MPa operating pressure, this 100mm bore cylinder provides 3927N of push force and 3681N of pull force. The maximum operating pressure is 1.0 MPa.
The lock is spring-applied and air-released, located in the back cover to hold the rod at the retracted stroke end. It engages statically after the cylinder stops and unlocks 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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