This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X312S, 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 SI80X312S
The AirTAC SI80 Standard Air Cylinder SI80X312S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 312mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X312S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke312 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X312S
- 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 SI80X312S
The AirTAC SI80X312S is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel, adjustable air cushions, and a built-in piston magnet. Delivering 2513 N push force at 0.5 MPa through its G3/8 port, it is replaced by the SAI80X312S. This direct successor matches the exact bore, stroke, force, port, and ISO 15552 mounting interface, fitting existing fixtures perfectly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S SKU uses legacy CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI80 Standard Air Cylinder SI80X312S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X312S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X312S |
| Bore size | Ø80 mm |
| Stroke | 312 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 SAI80X312S 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 SAI80X312S 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 SI80X312S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×312 | 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 SI80X312S Is Used
Pallet Diversion
Routes heavy pallets across transfer lines using the 2513 N push force, with the 312 mm stroke providing ample travel for complete lane shifts.
Vertical Lift Gate
Actuates mezzanine safety gates where the computed 128 kg vertical lift capacity easily handles heavy barrier panels over the 312 mm extension.
Press Ejection
Ejects formed metal parts from hydraulic presses, relying on adjustable end cushions to decelerate the 80 mm bore before impact.
Replacing the Airtac SI80 Standard Air Cylinder SI80X312S with the SAI80X312S
To replace the SI80X312S, order the SAI80X312S. Confirm the ISO 15552 mounting interface, G3/8 port, M20x1.5 rod thread, and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet transfers directly, though you must update legacy CS1-B/DS1-B sensors to current AirTAC switches. Because 312 mm exceeds the standard stroke increments, it is a nonstandard stroke; at this length, prevent rod bending by guiding the load externally to avoid side-load forces. Sizing both ways: a 63 mm bore yields 1559 N push @0.5 MPa, while a 100 mm bore yields 3927 N. Remember, 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.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X312S
- ✓ 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 SI80X312S FAQ
Yes, the SI80X312S is discontinued. The direct replacement is the SAI80X312S. It is dimensionally interchangeable per ISO 15552, retaining the same 80 mm bore, 312 mm stroke, 513 kgf max force, G3/8 port, and mounting interface.
At 0.5 MPa it provides 2513 N push and 2268 N pull; at 0.7 MPa push is 3518 N; and the theoretical max is 513 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and temperature range is -20 to +70 C.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X312S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X312S replacement — usually within 7-8 hours.