This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X850STC, 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 SI80X850STC
The AirTAC SI80 Standard Air Cylinder SI80X850STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 850mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X850STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke850 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X850STC
- 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 SI80X850STC
The AirTAC SI80X850STC is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 850mm stroke. Delivering 2513N push force at 0.5MPa, it features a G3/8 port, M20x1.5 rod thread, and a TC trunnion mount. AirTAC replaced this legacy unit with the SAI80X850STC, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI upgrade introduces a refined piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. For position sensing, the -S magnet on this unit works with legacy CS1-B/DS1-B switches, while the SAI family uses current AirTAC sensors.
Airtac SI80 Standard Air Cylinder SI80X850STC Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X850STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X850STC |
| Bore size | Ø80 mm |
| Stroke | 850 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 SAI80X850STC 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 SAI80X850STC 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 SI80X850STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×850 | 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 SI80X850STC Is Used
Large Fixture Actuation
Indexes heavy machining fixtures via the TC trunnion mount, absorbing end-of-stroke impact with the 36mm adjustable air cushions.
Replacing the Airtac SI80 Standard Air Cylinder SI80X850STC with the SAI80X850STC
To replace the SI80X850STC, order the SAI80X850STC. Verify the ISO 15552 TC trunnion mounting interface, 80mm bore, 850mm stroke, G3/8 port, and the -S magnet for sensing. If sizing down, a 63mm bore yields 1559N push at 0.5MPa; sizing up to 100mm provides 3927N. Because the 850mm stroke is long, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X850STC
- ✓ 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 SI80X850STC FAQ
Yes, the SI80X850STC is discontinued. The direct replacement is the SAI80X850STC, which shares the identical ISO 15552 mounting interface, 80mm bore, 850mm stroke, output force, and G3/8 port.
The 80mm bore features a G3/8 port and provides 2513N push / 2268N pull at 0.5MPa, 3518N push at 0.7MPa, and a theoretical maximum of 513kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X850STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X850STC replacement — usually within 7-8 hours.