This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX475, 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 SI125AX475
The AirTAC SI125 Standard Cylinder SI125AX475 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 475mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX475, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke475 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX475
- 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 SI125AX475
The AirTAC SI125AX475 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 475 mm stroke. It delivers 6136 N push force at 0.5 MPa through an extruded aluminum barrel with adjustable 40 mm cushions. The direct replacement is the SAI125AX475, which matches the exact bore, stroke, G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific SKU lacks a magnet (-S) and cannot accept a CS1-B/DS1-B sensor. It uses a SUS420J2 stainless rod (A option).
Airtac SI125 Standard Cylinder SI125AX475 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX475 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX475 |
| Bore size | Ø125 mm |
| Stroke | 475 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 SAI125AX475 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 SAI125AX475 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 SI125AX475
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×475 | 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 SI125AX475 Is Used
Heavy Stamp Press Feed
Drives robust 475 mm strokes to feed thick sheet metal into presses, utilizing the 6136 N push force at 0.5 MPa for heavy billet positioning.
Pallet Divert & Stop
Acts as a high-force stopper arm on automated conveyor lines, where the 125 mm bore easily halts heavy loaded pallets without bouncing.
Large Lift Gate Actuator
Raises and lowers substantial loading dock gates, requiring the 5734 N pull force to manage heavy counterweighted structures over long travel.
Replacing the Airtac SI125 Standard Cylinder SI125AX475 with the SAI125AX475
To replace the SI125AX475, order the SAI125AX475. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port, and the M27x2 thread. Because this 475 mm stroke is long, use external guides to prevent rod bending and side-load wear. For higher force, the 160 mm bore offers 10053 N push at 0.5 MPa; for less, the 100 mm bore provides 3927 N. Note that this non-magnet SKU cannot take a sensor. 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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX475
- ✓ 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 SI125AX475 FAQ
Yes, the SI125AX475 is discontinued. The direct replacement is the SAI125AX475. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 475 mm stroke, G1/2 port, and mounting fixtures.
It has 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 max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX475
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX475 replacement — usually within 7-8 hours.