This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X835S, 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 SI125X835S
The AirTAC SI125 Standard Cylinder SI125X835S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 835mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X835S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke835 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X835S
- 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 SI125X835S
The AirTAC SI125X835S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 835 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this EOL unit with the SAI125X835S, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL and BSAI lock variants absent in the legacy SI line.
Airtac SI125 Standard Cylinder SI125X835S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X835S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X835S |
| Bore size | Ø125 mm |
| Stroke | 835 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 SAI125X835S 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 SAI125X835S 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 SI125X835S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×835 | 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 SI125X835S Is Used
Heavy Press Clamping
Generates 8590 N at 0.7 MPa to secure heavy metal fabrications during machining or welding operations.
Pallet Diversion
The 835 mm stroke pushes large loaded pallets across transfer lines, requiring external guides to prevent rod bending.
Replacing the Airtac SI125 Standard Cylinder SI125X835S with the SAI125X835S
To replace the SI125X835S, order the SAI125X835S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port thread (PT, G, or NPT), and the M27x2 rod-end thread. The -S suffix indicates a piston magnet for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC sensors. If sizing up or down, note the 100 mm bore offers 3927 N push, while the 160 mm bore provides 10053 N at 0.5 MPa. Because stroke is 835 mm, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, specify the SAIL lock variant or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X835S
- ✓ 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 SI125X835S FAQ
Yes, the SI125X835S is discontinued. The direct replacement is the SAI125X835S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 835 mm stroke, G1/2 port, and mounting hardware, but features an upgraded piston seal.
It has a G1/2 port. Force ratings are 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X835S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X835S replacement — usually within 7-8 hours.