This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X235SN, 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 SI125X235SN
The AirTAC SI125 Standard Cylinder SI125X235SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 235mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X235SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke235 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X235SN
- 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 SI125X235SN
The AirTAC SI125X235SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 235 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X235SN, retaining the same interface, output, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The SAI family adds SAIL, SAIF and BSAI variants. The NBR seal handles -20 to +70 C; Viton H extends this to 150 C.
Airtac SI125 Standard Cylinder SI125X235SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X235SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X235SN |
| Bore size | Ø125 mm |
| Stroke | 235 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 SAI125X235SN 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 SAI125X235SN 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 SI125X235SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×235 | 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 SI125X235SN Is Used
Heavy Stamping Press
Drives heavy-duty stamping actuators requiring 6136 N push force at 0.5 MPa with robust 32 mm rod stability.
Bulk Material Divert
Diverts heavy bulk material packages on high-throughput conveyors using adjustable 40 mm cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X235SN with the SAI125X235SN
To replace the SI125X235SN, order the SAI125X235SN direct. Confirm the ISO 15552 mounting interface, 235 mm stroke, G1/2 port, and M27x2 rod thread. The magnet (-S) works with legacy CS1-B/DS1-B sensors; SAI uses current AirTAC switches. The NBR (-N) seal is standard. If sizing up or down, neighbor bores are 100 mm (3927 N push @0.5 MPa) and 160 mm (10053 N push @0.5 MPa). For load holding, a plain cylinder drifts without live air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 235 mm stroke, side-load is minimal, but ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X235SN
- ✓ 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 SI125X235SN FAQ
Yes, the SI125X235SN is discontinued. The direct replacement is the SAI125X235SN. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 235 mm stroke, G1/2 port, and mounting hardware.
The G1/2 port 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 max force of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X235SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X235SN replacement — usually within 7-8 hours.