This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X353SN, 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 SI125X353SN
The AirTAC SI125 Standard Cylinder SI125X353SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 353mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X353SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke353 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X353SN
- 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 SI125X353SN
The AirTAC SI125X353SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 353 mm stroke. It delivers 6136 N push force at 0.5 MPa and includes a G1/2 air port. AirTAC replaced this legacy unit with the SAI125X353SN, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The NBR seal handles -20 to +70 C, while a Viton H option raises heat resistance to 150 C. The SAI family also adds SAIL lock and BSAI clamp-lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X353SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X353SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X353SN |
| Bore size | Ø125 mm |
| Stroke | 353 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 SAI125X353SN 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 SAI125X353SN 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 SI125X353SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×353 | 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 SI125X353SN Is Used
Heavy Stamping Press
Drives heavy-duty stamping actuators where the 11045 N push force at 0.9 MPa securely forms thick metal components.
Pallet Lift Station
Lifts loaded pallets vertically, utilizing the 313 kg safe vertical lift capacity to elevate goods between conveyor tiers.
Large Mold Clamping
Holds large injection molds in place during setup, relying on the 125 mm bore and 353 mm stroke for deep reach.
Replacing the Airtac SI125 Standard Cylinder SI125X353SN with the SAI125X353SN
To replace the SI125X353SN, order the SAI125X353SN direct. Verify the ISO 15552 mounting interface, 125 mm bore, 353 mm stroke, G1/2 port (PT/G/NPT thread), and mounting accessory. The -S magnet works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches; the -N denotes the NBR seal. Sizing checks: a 100 mm bore yields 3927 N [email protected], while a 160 mm bore yields 10053 N. Because the 353 mm stroke can induce rod bending, use external guides to prevent side loads. A plain cylinder drifts without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X353SN
- ✓ 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 SI125X353SN FAQ
Yes, the SI125X353SN is discontinued. The direct replacement is the SAI125X353SN. It shares the identical ISO 15552 mounting interface, 125 mm bore, 353 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
It features a G1/2 air port. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X353SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X353SN replacement — usually within 7-8 hours.