This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1000, 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 SI125X1000
The AirTAC SI125 Standard Cylinder SI125X1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1000mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1000 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1000
- 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 SI125X1000
The AirTAC SI125X1000 is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa. AirTAC replaced it with the SAI125X1000, a direct upgrade retaining the exact 125 mm bore, 1000 mm stroke, G1/2 port, and ISO 15552 mounting interface. This means it drops directly into existing fixtures without mechanical changes.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot accept a sensor, and the SAI family adds lock variants (SAIL, BSAI) the SI lacked.
Airtac SI125 Standard Cylinder SI125X1000 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1000 |
| Bore size | Ø125 mm |
| Stroke | 1000 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 SAI125X1000 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 SAI125X1000 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 SI125X1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1000 | 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 SI125X1000 Is Used
Heavy Press Ejection
Provides the 6136 N push at 0.5 MPa required to eject dense stamped parts from heavy press dies over a 1000 mm extraction distance.
Large Material Transfer
Shifts bulky assemblies or bulk material hoppers across a 1-meter gap between conveyor lines using the 125 mm bore's high force.
Replacing the Airtac SI125 Standard Cylinder SI125X1000 with the SAI125X1000
To replace the SI125X1000, order the SAI125X1000. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 air port, and thread options (PT/G/NPT). Because this SKU lacks the -S magnet, it cannot host CS1-B/DS1-B sensors; switch to a current AirTAC switch on an SAI-S model if position feedback is needed. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify a SAIL/BSAI lock variant. With a 1000 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1000
- ✓ 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 SI125X1000 FAQ
Yes, the SI125X1000 is discontinued. The direct replacement is the SAI125X1000. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1000 mm stroke, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
The 125 mm bore features a G1/2 air port and a 32 mm rod. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1000 replacement — usually within 7-8 hours.