This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X585, 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 SI125X585
The AirTAC SI125 Standard Cylinder SI125X585 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 585mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X585, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke585 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X585
- 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 SI125X585
The AirTAC SI125X585 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 585 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features a 32 mm rod, M27x2 thread, G1/2 port, and 40 mm adjustable cushions. The direct replacement is the SAI125X585, matching the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while adding SAIL, SAIF, and BSAI lock variants the SI lacked. This SKU has no magnet and cannot take a sensor. For load holding, note the cushion only decelerates; use an external rod lock or pilot check valve.
Airtac SI125 Standard Cylinder SI125X585 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X585 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X585 |
| Bore size | Ø125 mm |
| Stroke | 585 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 SAI125X585 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 SAI125X585 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 SI125X585
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×585 | 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 SI125X585 Is Used
Heavy Pressing
Applies 6136 N of thrust at 0.5 MPa for heavy-duty pressing, stamping, and forming tasks in automated lines.
Pallet Diverting
Handles large payload diverting and sorting across wide conveyor belts using the 585 mm extended stroke.
Replacing the Airtac SI125 Standard Cylinder SI125X585 with the SAI125X585
To replace the SI125X585, order the SAI125X585. Verify the ISO 15552 mounting interface, 125 mm bore, 585 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. This SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. If sizing up or down, neighboring bores are 100 mm (3927 N push @0.5) and 160 mm (10053 N push @0.5). Because stroke is 585 mm, use external guides to prevent rod bending and side loads. For load holding on air loss, the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X585
- ✓ 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 SI125X585 FAQ
Yes, the SI125X585 is discontinued. The direct replacement is the SAI125X585, matching the ISO 15552 mounting interface, bore, stroke, force, and port size.
The G1/2 port bore delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X585
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X585 replacement — usually within 7-8 hours.