This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X245, 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 SI125X245
The AirTAC SI125 Standard Cylinder SI125X245 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 245mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X245, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke245 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X245
- 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 SI125X245
The AirTAC SI125X245 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 245mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X245, matching the exact bore, stroke, force, port and mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X245 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X245 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X245 |
| Bore size | Ø125 mm |
| Stroke | 245 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 SAI125X245 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 SAI125X245 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 SI125X245
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×245 | 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 SI125X245 Is Used
Heavy Press Operations
Drives robust pressing and stamping fixtures requiring substantial thrust, utilizing the 6136N push force at 0.5MPa to form or seat heavy components reliably.
Pallet Diversion
Actuates large diverter arms or alignment stops in high-capacity conveyor lines, moving loaded pallets with a 313kg vertical lift margin.
Mold Handling
Shifts heavy injection molds or tooling platens within production cells, benefiting from the rigid ISO 15552 profile barrel and 32mm rod stability.
Replacing the Airtac SI125 Standard Cylinder SI125X245 with the SAI125X245
To replace the SI125X245, order the SAI125X245 to retain the exact ISO 15552 mounting interface, 245mm stroke, G1/2 port and M27x2 rod thread. Confirm your mounting accessory (LB, FA, TC, etc.) and thread type (PT/G/NPT). Because this specific SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if position feedback is needed. For sizing, the 125mm bore yields 6136N push at 0.5MPa; if less force is required, step down to an 100mm bore (3927N), or step up to 160mm (10053N) for heavier loads. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. The SAI family also adds the SAIF self-valve option (bores 32-100) and Viton H seals for high temp.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X245
- ✓ 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 SI125X245 FAQ
Yes, the SI125X245 is discontinued. The direct replacement is the SAI125X245. It shares the same ISO 15552 mounting interface, 125mm bore, 245mm stroke, output force, G1/2 port, and accessories, fitting directly into existing fixtures.
The 125mm bore provides 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa. Operating speed is 30-500mm/s, with a 40mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X245
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X245 replacement — usually within 7-8 hours.