This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX800S, 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 SI125AX800S
The AirTAC SI125 Standard Cylinder SI125AX800S 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 SAI125AX800S, 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 → SAI125AX800S
- 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 SI125AX800S
The AirTAC SI125AX800S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 800 mm stroke. It delivers 6136 N push force at 0.5 MPa, features a SUS420J2 stainless steel rod, and includes a piston magnet for CS1-B/DS1-B sensors. The direct replacement is the SAI125AX800S, retaining the exact same G1/2 port, M27x2 thread, and mounting interface.
Upgrading to the SAI125AX800S introduces an improved piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also expands functionality with SAIL, SAIF, and BSAI lock variants that the legacy SI lacked.
Airtac SI125 Standard Cylinder SI125AX800S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX800S |
| 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 SAI125AX800S 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 SAI125AX800S 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 SI125AX800S
| 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 SI125AX800S Is Used
Heavy Press Ejection
Provides the 6136 N push force required to eject dense stampings from heavy presses, utilizing the 800 mm stroke to clear the die area completely.
Pallet Diversion
Actuates large-scale pallet routing gates where the 313 kg vertical lift margin easily handles heavy loads over an extended 800 mm transfer distance.
Automated Storage Retrieval
Drives vertical extraction arms in automated storage systems, benefiting from the SUS420J2 stainless rod in humid or mildly corrosive warehouse environments.
Replacing the Airtac SI125 Standard Cylinder SI125AX800S with the SAI125AX800S
To replace the SI125AX800S, order the SAI125AX800S. Confirm the ISO 15552 mounting interface, 125 mm bore, 800 mm stroke, G1/2 port, and the -S magnet for current AirTAC switch compatibility. If downsizing, a 100 mm bore yields 3927 N at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. Note that an 800 mm stroke requires external guides to prevent rod bending and excessive side loads. For load holding on air loss, the standard cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX800S
- ✓ 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 SI125AX800S FAQ
Yes, the SI125AX800S is discontinued. The direct replacement is the SAI125AX800S. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, force, G1/2 port, and mounting fixtures perfectly.
The 125 mm bore 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 maximum theoretical force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX800S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX800S replacement — usually within 7-8 hours.