This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X270STC, 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 SI80X270STC
The AirTAC SI80 Standard Air Cylinder SI80X270STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 270mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X270STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke270 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X270STC
- 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 SI80X270STC
The AirTAC SI80X270STC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore, 270 mm stroke, and a TC trunnion mount. Delivering 2513 N push force at 0.5 MPa through a G3/8 port, it is replaced by the SAI80X270STC. This direct successor shares the exact ISO 15552 mounting interface, bore, stroke, and output force, fitting existing fixtures seamlessly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. Your -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI80 Standard Air Cylinder SI80X270STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X270STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X270STC |
| Bore size | Ø80 mm |
| Stroke | 270 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 SAI80X270STC 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 SAI80X270STC 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 SI80X270STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×270 | 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 SI80X270STC Is Used
Press Clamping
Applies 2513 N of push force at 0.5 MPa to secure heavy workpieces in machining fixtures, utilizing the TC trunnion to accommodate angular alignment.
Pallet Diversion
Uses the 270 mm stroke to push heavy pallets onto secondary conveyor lines, absorbing end-of-stroke kinetic energy via the 36 mm adjustable air cushions.
Replacing the Airtac SI80 Standard Air Cylinder SI80X270STC with the SAI80X270STC
To replace the SI80X270STC, order the SAI80X270STC. Confirm the ISO 15552 TC trunnion mount, 80 mm bore, 270 mm stroke, G3/8 port, and the -S magnet for current AirTAC switch compatibility. If downsizing, a 63 mm bore yields 1559 N push at 0.5 MPa; if upsizing, a 100 mm bore provides 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 270 mm stroke, minimize side-load rod-bending by guiding the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X270STC
- ✓ 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 SI80X270STC FAQ
Yes, the AirTAC SI80X270STC is discontinued. The direct replacement is the SAI80X270STC. It is dimensionally interchangeable per ISO 15552, retaining the same 80 mm bore, 270 mm stroke, TC mount, G3/8 port, and output force.
The 80 mm bore delivers 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a theoretical max of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a 25 mm rod, M20x1.5 thread, and 36 mm cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X270STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X270STC replacement — usually within 7-8 hours.