This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX180, 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 SI125AX180
The AirTAC SI125 Standard Cylinder SI125AX180 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 180mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX180, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX180
- 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 SI125AX180
The AirTAC SI125AX180 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 180 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125AX180, sharing the exact G1/2 port, M27x2 rod thread and 40 mm cushions. This non-magnetic SKU cannot take a sensor; the legacy SI used CS1-B/DS1-B switches. It features a SUS420J2 stainless rod.
The SAI125AX180 upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. A plain cylinder drifts without air; use SAIL or an external rod lock to hold loads.
Airtac SI125 Standard Cylinder SI125AX180 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX180 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX180 |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAI125AX180 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 SAI125AX180 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 SI125AX180
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SI125AX180 Is Used
Heavy Press Clamping
Generates 6136 N at 0.5 MPa to secure heavy metal workpieces in machining fixtures, utilizing the SUS420J2 stainless rod for corrosion resistance in coolant environments.
Pallet Diverting
Provides robust 125 mm bore actuation for diverting loaded pallets on conveyors, with the 180 mm stroke moving loads safely within the 30-500 mm/s speed range.
Industrial Forming
Delivers up to 1251 kgf theoretical max force for light forming or stamping tasks, dropping directly into existing ISO 15552 machinery profiles via the SAI replacement.
Replacing the Airtac SI125 Standard Cylinder SI125AX180 with the SAI125AX180
To replace the SI125AX180, order the SAI125AX180. Verify the ISO 15552 mounting interface, 125 mm bore, 180 mm stroke, G1/2 port (PT/G/NPT thread), and mounting accessory. Because this SKU lacks the -S magnet, it cannot accept position sensors; if sensing is needed, select an SAI125AX180S. The default rod is carbon steel, but this A-suffix unit uses SUS420J2 stainless for corrosion resistance. Operating speed is 30-500 mm/s. For loads needing holding on air loss, the standard cushion only decelerates; specify a SAIL or BSAI lock variant, or add an external pilot check valve. At 180 mm stroke, side-load is minimal, but for any stroke >=300 mm always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX180
- ✓ 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 SI125AX180 FAQ
Yes, the SI125AX180 is discontinued. The direct replacement is the AirTAC SAI125AX180. It shares the same ISO 15552 mounting interface, 125 mm bore, 180 mm stroke, output force, G1/2 port, and 40 mm adjustable cushions, fitting existing fixtures perfectly.
The 125 mm bore features a G1/2 air port and M27x2 rod thread. Force ratings are: 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; with 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 SAI125AX180
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX180 replacement — usually within 7-8 hours.