This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X125STC, 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 SI80 Standard Air Cylinder SI80X125STC
The AirTAC SI80 Standard Air Cylinder SI80X125STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 125mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X125STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke125 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X125STC
- 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 SI80 Standard Air Cylinder SI80X125STC
The AirTAC SI80X125STC is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, delivering a push force of 2513 N at 0.5 MPa. AirTAC replaced it with the SAI80X125STC, a direct upgrade retaining the exact 80mm bore, 125mm stroke, G3/8 port, M20x1.5 rod thread and TC trunnion mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B sensors, and Viton H seal options extend the temperature range to 150 C.
Airtac SI80 Standard Air Cylinder SI80X125STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X125STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X125STC |
| Bore size | Ø80 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI80X125STC carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80X125STC produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80X125STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×125 | 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 SI80 Standard Air Cylinder SI80X125STC Is Used
Mid-Tonnage Pressing
Applies the 2513 N push force at 0.5 MPa for seating bearings, stamping light-gauge plates, or clinching sheet metal assemblies.
Pallet Diversion
Uses the 125mm stroke and TC trunnion mount to actuate heavy lane guides and pusher arms on 80mm profile conveyor lines.
Replacing the Airtac SI80 Standard Air Cylinder SI80X125STC with the SAI80X125STC
To replace the SI80X125STC, order the SAI80X125STC and verify the ISO 15552 TC trunnion mounting, 125mm stroke, G3/8 port and the -S magnet for current AirTAC switches. If you need more force, the neighboring 100mm bore provides 3927 N push at 0.5 MPa; if less is required, the 63mm bore offers 1559 N. Remember that a standard cylinder drifts without live air—the 36mm adjustable cushions only decelerate at stroke end. For load holding on air loss, specify an external pilot check valve or choose the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X125STC
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80X125STC FAQ
Yes, the SI80X125STC is discontinued. The direct replacement is the AirTAC SAI80X125STC. It is dimensionally interchangeable per ISO 15552, matching the 80mm bore, 125mm stroke, G3/8 port, TC trunnion mount and output force so it drops directly into existing fixtures.
This double-acting cylinder operates at 30-800 mm/s. At 0.5 MPa it provides 2513 N push and 2268 N pull. At 0.7 MPa push is 3518 N, at 0.9 MPa it is 4523 N, and the theoretical maximum force is 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X125STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X125STC replacement — usually within 7-8 hours.