This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X50SN, 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 SI80X50SN
The AirTAC SI80 Standard Air Cylinder SI80X50SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X50SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X50SN
- 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 SI80X50SN
The AirTAC SI80X50SN is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm stroke, delivering 2513 N push force at 0.5 MPa. It features a Ø25 mm piston rod, M20x1.5 thread, 36 mm adjustable air cushions and a G3/8 port. The direct replacement is the SAI80X50SN, matching the exact ISO 15552 mounting interface, bore, stroke, output force and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The NBR (-N) seal supports -20 to +70 C, with Viton H available for high heat. With the -S magnet, this legacy SKU uses CS1-B/DS1-B switches, while the SAI uses current AirTAC sensors.
Airtac SI80 Standard Air Cylinder SI80X50SN Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X50SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X50SN |
| Bore size | Ø80 mm |
| Stroke | 50 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 SAI80X50SN 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 SAI80X50SN 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 SI80X50SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×50 | 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 SI80X50SN Is Used
Mid-Tonnage Clamping
Secures heavy workpieces in CNC machining fixtures, utilizing the 2513 N push force at 0.5 MPa for rigid, zero-shift holding during aggressive metal removal.
Package Diversion
Drives robust routing gates on high-speed packaging conveyors, where the short 50 mm stroke provides rapid actuation to redirect heavy cartons between lanes.
Pallet Stopping
Acts as a heavy-duty end-stop on roller conveyors to halt incoming pallets safely, absorbing kinetic energy via the 36 mm adjustable air cushions.
Replacing the Airtac SI80 Standard Air Cylinder SI80X50SN with the SAI80X50SN
To replace the SI80X50SN, order the SAI80X50SN direct, verifying the ISO 15552 mounting accessory (LB, FA, TC, etc.), G3/8 port and the -S magnet for current AirTAC switch compatibility. If sizing down, the 63 mm bore yields 1559 N push at 0.5 MPa; if sizing up, the 100 mm bore yields 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates near stroke end—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant offers a built-in valve for bores up to 100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X50SN
- ✓ 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 SI80X50SN FAQ
Yes, the AirTAC SI80X50SN is discontinued. The direct replacement is the SAI80X50SN. It is dimensionally interchangeable per ISO 15552, retaining the same 80 mm bore, 50 mm stroke, 2513 N force, G3/8 port and mounting interface, but features an upgraded two Y-shaped one-way piston seal.
The G3/8 ported 80 mm bore provides 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 maximum force of 513 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa with a proof pressure of 1.5 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X50SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X50SN replacement — usually within 7-8 hours.