This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X580TC, 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 SI125X580TC
The AirTAC SI125 Standard Cylinder SI125X580TC 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 SAI125X580TC, 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 → SAI125X580TC
- 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 SI125X580TC
The AirTAC SI125X580TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 580 mm stroke and TC trunnion mount. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X580TC, a direct sharing the exact same interface, bore, stroke and force.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SKU lacks the -S magnet, it cannot accept a sensor. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X580TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X580TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X580TC |
| 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 SAI125X580TC 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 SAI125X580TC 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 SI125X580TC
| 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 SI125X580TC Is Used
Heavy Stamp Press
Drives large stamping dies requiring 8590 N push at 0.7 MPa, relying on the 40 mm adjustable cushions to absorb end-of-stroke impact.
Pallet Diverters
Actuates heavy pallet routing gates on assembly lines, moving loads safely within the 3682 N working load limit.
Replacing the Airtac SI125 Standard Cylinder SI125X580TC with the SAI125X580TC
To replace the SI125X580TC, order the SAI125X580TC. It drops into existing fixtures via the ISO 15552 TC trunnion interface, matching the 125 mm bore, 580 mm stroke, M27x2 rod thread and G1/2 port. If sizing down, the 100 mm bore yields 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 580 mm, prevent rod bending by guiding the load externally. This no-magnet SKU cannot take a switch.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X580TC
- ✓ 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 SI125X580TC FAQ
Yes, the SI125X580TC is discontinued. The direct replacement is the SAI125X580TC. It shares the identical ISO 15552 TC mounting interface, 125 mm bore, 580 mm stroke, G1/2 port and output force, fitting existing fixtures perfectly.
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X580TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X580TC replacement — usually within 7-8 hours.