This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X235, 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 SI125X235
The AirTAC SI125 Standard Cylinder SI125X235 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 SAI125X235, 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 → SAI125X235
- 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 SI125X235
The AirTAC SI125X235 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 SAI125X235, retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a sensor. For high heat, Viton H seals raise the limit to 150 C.
Airtac SI125 Standard Cylinder SI125X235 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X235 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X235 |
| 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 SAI125X235 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 SAI125X235 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 SI125X235
| 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 SI125X235 Is Used
Heavy Press Clamping
Secures large metal castings in machining fixtures using the 6136 N push force at 0.5 MPa, relying on the rigid 125 mm profile barrel.
Pallet Lift Gates
Raises and lowers heavy loaded pallet gates; the 235 mm stroke provides the precise travel needed for automated conveyor divergence.
Industrial Door Actuation
Drives robust automated factory doors where the 5734 N pull force at 0.5 MPa easily overcomes mechanical friction and door weight.
Replacing the Airtac SI125 Standard Cylinder SI125X235 with the SAI125X235
To replace the SI125X235, order the SAI125X235 and confirm the ISO 15552 mounting interface, 235 mm stroke, G1/2 port, and M27x2 rod thread. Because this SKU has no -S magnet, it cannot accept position switches; order an SAI125X235S if sensing is needed. If sizing down, a 100 mm bore gives 3927 N at 0.5 MPa; sizing up to 160 mm provides 10053 N. A plain cylinder drifts on air loss, so for load holding use the SAIL or BSAI lock variant, or an external pilot check valve. At 235 mm stroke, side-load risks are low, but ensure front mounting alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X235
- ✓ 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 SI125X235 FAQ
Yes, the SI125X235 is discontinued. The direct replacement is the SAI125X235. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 235 mm stroke, 6136 N force, G1/2 port, and mounting accessories.
The G1/2 port feeds a 125 mm bore yielding 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X235
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X235 replacement — usually within 7-8 hours.