This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X20SFA, 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 SI80X20SFA
The AirTAC SI80 Standard Air Cylinder SI80X20SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 20mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X20SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke20 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X20SFA
- 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 SI80X20SFA
The AirTAC SI80X20SFA is a discontinued double-acting ISO 15552 profile cylinder with an FA flange mount and a 20 mm stroke. In the 80 mm bore class it delivers 2513 N push and 2268 N pull at 0.5 MPa, operating through a G3/8 port. AirTAC replaced this legacy unit with the SAI80X20SFA, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, force, port and flange accessory.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended lifespan and lower start-up pressure. For applications needing load holding on air loss, the new SAI family adds SAIL and BSAI lock variants the original SI lacked.
Airtac SI80 Standard Air Cylinder SI80X20SFA Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X20SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X20SFA |
| Bore size | Ø80 mm |
| Stroke | 20 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 SAI80X20SFA 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 SAI80X20SFA 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 SI80X20SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×20 | 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 SI80X20SFA Is Used
Short-Stroke Clamping
Ideal for holding heavy workpieces in machining fixtures where a robust 80 mm bore and 20 mm stroke provide high clamping force in a compact footprint.
Press Fit Operations
Delivers 2513 N of push force at 0.5 MPa, suitable for seating bearings or pins in automated assembly lines without requiring full system pressure.
Ejector Mechanisms
Provides a fast, powerful 20 mm ejection stroke to push finished parts out of molds or dies, utilizing the adjustable air cushion to soften end-of-stroke impact.
Replacing the Airtac SI80 Standard Air Cylinder SI80X20SFA with the SAI80X20SFA
To replace the discontinued SI80X20SFA, order the SAI80X20SFA. Confirm the ISO 15552 FA flange interface, the 80 mm bore, the 20 mm stroke, the G3/8 port (available in PT, G or NPT), and the -S magnet for position sensing. The SAI accepts current AirTAC switches, whereas the legacy SI used CS1-B/DS1-B sensors. If sizing up or down, neighbouring bores are 63 mm (1559 N push @0.5 MPa) and 100 mm (3927 N push @0.5 MPa). A plain cylinder drifts on air loss as the cushion only decelerates; for secure load holding, specify an external pilot check valve, a rod lock, or the SAIL/BSAI locking variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X20SFA
- ✓ 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 SI80X20SFA FAQ
Yes, the SI80X20SFA is discontinued. The direct replacement is the AirTAC SAI80X20SFA. It features the same ISO 15552 mounting interface, 80 mm bore, 20 mm stroke, output force, G3/8 port and FA flange mount, dropping directly into existing fixtures.
The 80 mm bore uses a G3/8 port. Theoretical thrust 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 maximum force of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X20SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X20SFA replacement — usually within 7-8 hours.