This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X505, 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 SI125X505
The AirTAC SI125 Standard Cylinder SI125X505 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 505mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X505, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke505 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X505
- 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 SI125X505
The AirTAC SI125X505 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 505 mm stroke. It delivers a thrust of 6136 N at 0.5 MPa and uses a G1/2 air port. AirTAC replaced this legacy unit with the SAI125X505, a direct upgrade retaining the exact bore, stroke, force, port and mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI variants the SI lacked. Since this specific SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor.
Airtac SI125 Standard Cylinder SI125X505 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X505 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X505 |
| Bore size | Ø125 mm |
| Stroke | 505 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 SAI125X505 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 SAI125X505 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 SI125X505
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×505 | 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 SI125X505 Is Used
Heavy Stamping Press
Drives large platens and stamping dies requiring high thrust over a long 505 mm travel distance.
Pallet Transfer
Shifts loaded pallets on conveyors where the 125 mm bore provides the necessary push force for heavy goods.
Large Mold Handling
Actuates heavy molding equipment, utilizing the adjustable 40 mm cushions to decelerate massive loads safely.
Replacing the Airtac SI125 Standard Cylinder SI125X505 with the SAI125X505
To replace the SI125X505, order the SAI125X505. It drops directly into existing ISO 15552 fixtures with the same 125 mm bore, 505 mm stroke, G1/2 port, M27x2 rod thread and 40 mm cushions. Confirm your mounting type (LB, FA, TC, etc.) and thread standard (PT, G, NPT). If you need more force, the 160 mm bore yields 10053 N push at 0.5 MPa; if less is required, the 100 mm bore provides 3927 N. Because this SKU has no -S magnet, you cannot mount position sensors. For load holding on air loss, note that the cushion only decelerates; use an external pilot check valve, rod lock, or the SAIL/BSAI lock variant. Finally, with a 505 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X505
- ✓ 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 SI125X505 FAQ
Yes, the SI125X505 is discontinued. The direct replacement is the AirTAC SAI125X505. It is dimensionally interchangeable per ISO 15552, offering the same bore, stroke, force, G1/2 port and mounting interface.
This double-acting cylinder uses a G1/2 air port. At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa it pushes 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X505
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X505 replacement — usually within 7-8 hours.