This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X640STC, 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 SI80X640STC
The AirTAC SI80 Standard Air Cylinder SI80X640STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 640mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X640STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke640 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X640STC
- 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 SI80X640STC
The AirTAC SI80X640STC is a discontinued double-acting ISO 15552 profile cylinder with a 640 mm stroke and TC trunnion mount. Delivering 2513 N push force at 0.5 MPa via a G3/8 port, it is replaced by the SAI80X640STC. This direct upgrade shares the exact ISO 15552 mounting interface, bore, and force. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The S family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
The -S code indicates a piston magnet for legacy CS1-B/DS1-B sensors; the SAI replacement uses current AirTAC switches. For high-temperature needs up to 150 C, Viton H seals are an option, and SUS304 (B) rod material resists corrosion.
Airtac SI80 Standard Air Cylinder SI80X640STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X640STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X640STC |
| Bore size | Ø80 mm |
| Stroke | 640 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 SAI80X640STC 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 SAI80X640STC 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 SI80X640STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×640 | 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 SI80X640STC Is Used
Pallet Diversion
Routes heavy pallets on a packaging line using the TC trunnion mount to absorb mid-stroke torque during 640 mm travel.
Vertical Lift Gate
Raises a 120 kg mezzanine access gate, staying within the 128 kg safe vertical lift limit calculated at 0.5 MPa.
Press Ejection
Pushes formed metal parts out of a hydraulic press, relying on 2513 N of thrust and end-cushioning to prevent impact.
Replacing the Airtac SI80 Standard Air Cylinder SI80X640STC with the SAI80X640STC
To replace the SI80X640STC, order the SAI80X640STC. Verify the ISO 15552 TC trunnion interface, 80 mm bore, 640 mm stroke, G3/8 port (PT/G/NPT thread options), and the -S magnet. Sizing both ways: a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. Because this is a 640 mm stroke, use an external guide to prevent rod bending and side loads. A plain cylinder drifts on air loss; the 36 mm adjustable cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X640STC
- ✓ 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 SI80X640STC FAQ
Yes, the SI80X640STC is discontinued. The direct replacement is the SAI80X640STC. It shares the same ISO 15552 mounting interface, 80 mm bore, 640 mm stroke, G3/8 port, and output force, fitting existing fixtures directly.
The bore is 80 mm with a G3/8 port. Force output is 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa. The rod is 25 mm with an M20x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X640STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X640STC replacement — usually within 7-8 hours.