This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X800S, 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 SI125X800S
The AirTAC SI125 Standard Cylinder SI125X800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 800mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X800S
- 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 SI125X800S
The AirTAC SI125X800S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering 6136 N push force at 0.5 MPa. It features a 125 mm bore, 800 mm stroke, G1/2 port, and a built-in magnet for CS1-B/DS1-B sensors.
The direct replacement is the SAI125X800S, retaining the same ISO 15552 mounting interface, output force, and port size. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SI125 Standard Cylinder SI125X800S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X800S |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAI125X800S 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 SAI125X800S 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 SI125X800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SI125X800S Is Used
Heavy Stamp Press Feed
Pushes large blanks into a hydraulic press, utilizing the 6136 N thrust at 0.5 MPa to move heavy steel plates reliably over the 800 mm travel distance.
Pallet Discharge Ejector
Ejects fully loaded pallets from a packaging cell, requiring the extended 800 mm stroke to clear the conveyor before the downstream accumulation zone.
Replacing the Airtac SI125 Standard Cylinder SI125X800S with the SAI125X800S
To replace the SI125X800S, order the SAI125X800S and verify the ISO 15552 mounting interface, 125 mm bore, 800 mm stroke, G1/2 port, and magnet option. If downsizing, a 100 mm bore yields 3927 N at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. Because this is an 800 mm stroke, use external guides to prevent rod bending and side-load damage. 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 the SAIL or BSAI lock variant. The SAI family also includes the SAIF valve variant for smaller bores.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X800S
- ✓ 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 SI125X800S FAQ
Yes, the SI125X800S is discontinued. The direct replacement is the SAI125X800S. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 125 mm bore, 800 mm stroke, G1/2 port, and output force to fit existing fixtures.
At 0.5 MPa, the push force is 6136 N and pull is 5734 N. At 0.7 MPa it pushes 8590 N, and at 0.9 MPa it pushes 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X800S replacement — usually within 7-8 hours.