This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500N, 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 SI125X500N
The AirTAC SI125 Standard Cylinder SI125X500N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500N
- 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 SI125X500N
The AirTAC SI125X500N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 500 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X500N, which preserves the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
This SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SI SKU lacks the -S magnet, it cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X500N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500N |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500N 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 SAI125X500N 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 SI125X500N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500N Is Used
Heavy Press Forming
Ideal for driving large stamping or forming dies, utilizing the 6136 N push force at 0.5 MPa to shape heavy metal components reliably.
Pallet Lift Stations
Moves loaded pallets vertically over the 500 mm stroke, safely lifting masses up to 313 kg when guided externally to prevent rod bending.
Bulk Material Diversion
Actuates heavy-duty diverter arms on high-capacity conveyor lines, with the G1/2 port ensuring rapid air flow for 30-500 mm/s cycling.
Replacing the Airtac SI125 Standard Cylinder SI125X500N with the SAI125X500N
To replace the discontinued SI125X500N, order the SAI125X500N. Confirm the ISO 15552 mounting interface, 125 mm bore, 500 mm stroke, and G1/2 port (available in PT, G, or NPT threads). This SKU has no magnet (-S), so it cannot support position sensing; if switches are needed, select an SAI125X500NS and use current AirTAC sensors. For sizing, neighboring bores offer different forces: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. 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. With a 500 mm stroke, use external guides to prevent rod bending and side loads. The NBR seal supports -20 to +70 C; Viton H extends this to 150 C.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500N
- ✓ 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 SI125X500N FAQ
Yes, the AirTAC SI125X500N is discontinued. The direct replacement is the SAI125X500N. It is dimensionally interchangeable per ISO 15552, maintaining the same 125 mm bore, 500 mm stroke, output force, G1/2 port, and mounting accessories.
The bore is 125 mm with a G1/2 air port. Force output is 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500N replacement — usually within 7-8 hours.