This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80, 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 SI40 Standard Cylinder SI40X80
The AirTAC Airtac SI40 Standard Cylinder SI40X80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X80
- 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 SI40 Standard Cylinder SI40X80
The AirTAC SI40X80 is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and 40 mm bore. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X80, a direct upgrade retaining the exact interface, bore, stroke, force, and mounting.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B or DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X80 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80 |
| Bore size | Ø40 mm |
| Stroke | 80 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X80 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X80 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SI40 Standard Cylinder SI40X80 Is Used
Component Clamping
Secures medium-duty workpieces on machining fixtures, utilizing the 628 N push force at 0.5 MPa for stable holding during milling or drilling operations.
Package Diverting
Actuates sorting arms on packaging lines, where the 80 mm stroke provides rapid and precise redirection of goods between adjacent belts.
Pallet Stops
Functions as a pneumatic stop gate in material handling conveyors, arresting pallets reliably using the 528 N pull force at 0.5 MPa.
Replacing the Airtac SI40 Standard Cylinder SI40X80 with the SAI40X80
To replace the SI40X80, order the SAI40X80. Verify your ISO 15552 mounting fixture, 40 mm bore, 80 mm stroke, and G1/4 port (PT, G, or NPT thread). This SKU has no magnet and cannot support position sensing; if you need switches, select an SAI40X80S and use current AirTAC sensors. For higher force, the adjacent 50 mm bore yields 982 N push at 0.5 MPa. Remember, a standard cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X80 FAQ
Yes, the AirTAC SI40X80 is discontinued. The direct replacement is the SAI40X80. It shares the exact ISO 15552 mounting interface, 40 mm bore, 80 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The SI40X80 features a G1/4 air port and an M12x1.25 rod thread. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80 replacement — usually within 7-8 hours.