This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X580N, 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 SI125X580N
The AirTAC SI125 Standard Cylinder SI125X580N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 580mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X580N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke580 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X580N
- 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 SI125X580N
The AirTAC SI125X580N is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, adjustable air cushions, and a 580 mm stroke. Delivering 6136 N push force at 0.5 MPa, it uses a G1/2 port and an M27x2 rod thread. The NBR seal supports -20 to +70 C. Because this SKU lacks a magnet, it cannot accept a position switch. The direct replacement is the SAI125X580N, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For load holding, note that a standard cylinder drifts without live air; the cushion only decelerates. Use an external rod lock or pilot check valve, or specify the SAIL or BSAI lock variant.
Airtac SI125 Standard Cylinder SI125X580N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X580N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X580N |
| Bore size | Ø125 mm |
| Stroke | 580 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 SAI125X580N 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 SAI125X580N 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 SI125X580N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×580 | 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 SI125X580N Is Used
Heavy Stamping
Drives large presses and stamping dies requiring high thrust and a 580 mm reach.
Replacing the Airtac SI125 Standard Cylinder SI125X580N with the SAI125X580N
To replace the SI125X580N, order the SAI125X580N. Confirm the ISO 15552 mounting interface, the 125 mm bore, the 580 mm stroke, the G1/2 port, and your mounting accessory. This non-magnet version cannot take a sensor; if sensing is needed, order an SAI with the magnet option and use current AirTAC switches. If sizing both ways, neighboring bores offer 100 mm or 160 mm options, with this 125 mm bore providing 6136 N push at 0.5 MPa. For load holding on air loss, specify the SAIL or BSAI lock variant, or add an external pilot check valve. Because the 580 mm stroke is long, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X580N
- ✓ 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 SI125X580N FAQ
Yes, the SI125X580N is discontinued. The direct replacement is the SAI125X580N. It matches the ISO 15552 mounting interface, 125 mm bore, 580 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/2 port. It delivers 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. The speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X580N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X580N replacement — usually within 7-8 hours.