Airtac SAILB Rear Lock Cylinder SAILB100X25
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X25 is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 25mm 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
- Stroke25 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 SAILB100X25
The AirTAC SAILB100X25 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the back cover. This lock engages automatically when the piston reaches the retracted stroke end, ensuring your load is held securely without requiring continuous live air pressure. You can release the lock pneumatically via the air port or use the manual release lever during maintenance.
Delivering 3927N of push force and 3681N of pull force at 0.5MPa, this 100mm bore cylinder handles heavy loads with ease. The locker-end cushion is 24mm, intentionally shorter than the 36mm cushion on the free end to accommodate the locking mechanism. The carbon steel rod and PT tapered ports are standard, and it supports a speed range of 30-800mm/s.
Airtac SAILB Rear Lock Cylinder SAILB100X25 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X25 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 25 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 SAILB100X25 Is Used
Vertical Load Safety
Holds a lifted vertical load securely at the retracted stroke end during a sudden power loss, preventing uncontrolled drops.
End-of-Stroke Clamp
Maintains a locked retracted position on clamping fixtures without consuming continuous compressed air.
Gate Safety Hold
Secures heavy safety gates or machine guards in the closed position until the release air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X25 the Right Lock Cylinder?
Select this SAILB configuration when your application requires a fail-safe hold specifically at the fully retracted position. If your load needs to be clamped at an arbitrary mid-stroke point, the BSAI clamp-lock cylinder is the correct choice instead. To scale force, stepping down to a bore 80 yields 2513N push at 0.5MPa, while upgrading to bore 125 increases output to 6136N.
For safe operation, never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required. This is a static holding lock that engages after the rod stops, not a dynamic brake. If human safety depends on the load remaining in place, always add an independent safety measure. Replacement matches must verify the 100mm bore, 25mm stroke, back locker position, PT ports, and no magnet.
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 SAILB100X25 FAQ
At 0.5MPa operating pressure, the bore 100 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 at the retracted stroke end. It is a static hold that engages after the cylinder stops, not a mid-stroke clamp or dynamic brake. It unlocks automatically by supplying release air, or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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