This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X286S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X286S
The AirTAC SI125 Standard Cylinder SI125X286S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 286mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X286S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke286 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X286S
- 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 SI125 Standard Cylinder SI125X286S
The AirTAC SI125X286S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore, 286 mm stroke, and a G1/2 air port. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X286S. This direct successor matches the exact mounting interface, bore, and force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants the SI lacked. This -S SKU uses CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X286S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X286S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X286S |
| Bore size | Ø125 mm |
| Stroke | 286 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X286S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X286S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X286S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×286 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X286S Is Used
Automated Assembly Clamping
Secures large components during machining using the 125 mm bore and 286 mm stroke, ensuring rigid holding via the ISO 15552 mounting interface.
Pallet Transfer Routing
Routes heavy pallets along material handling lines, utilizing the 32 mm piston rod and G1/2 port to handle high flow and 5734 N pull force.
Replacing the Airtac SI125 Standard Cylinder SI125X286S with the SAI125X286S
To replace the SI125X286S, order the SAI125X286S, confirming the ISO 15552 interface, G1/2 port, M27x2 rod thread, and 286 mm stroke. Note that 286 mm is a nonstandard stroke. For sizing, the neighboring 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. A plain cylinder drifts without live air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 286 mm, ensure external guides to prevent rod bending and side loads. The -S magnet supports CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X286S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X286S FAQ
Yes, the SI125X286S is discontinued. The direct replacement is the SAI125X286S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 286 mm stroke, 6136 N force, G1/2 port, and mounting fixtures.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X286S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X286S replacement — usually within 7-8 hours.