This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX80S, 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 SI40AX80S
The AirTAC Airtac SI40 Standard Cylinder SI40AX80S 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 SAI40AX80S, 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 → SAI40AX80S
- 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 SI40AX80S
The AirTAC SI40AX80S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 80 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX80S, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The -A rod is SUS420J2 stainless steel, and the -S magnet works with CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40AX80S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX80S |
| 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 SAI40AX80S 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 SAI40AX80S 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 SI40AX80S
| 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 SI40AX80S Is Used
Compact Part Ejection
Uses the 628 N push force at 0.5 MPa to reliably eject small machined components from a fixture without damaging the surface.
Package Diverting
The 80 mm stroke actuates a diverting arm on a packaging line, moving light cartons at speeds up to 800 mm/s.
Vertical Lift Stops
Raises a 32 kg payload stop gate on a gravity conveyor, leveraging the SUS420J2 stainless rod for humid environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX80S with the SAI40AX80S
To replace this SI40AX80S, order the SAI40AX80S. Verify the ISO 15552 mounting interface, 80 mm stroke, G1/4 port, and your specific mounting accessory. The SUS420J2 stainless rod (-A) and magnet (-S) carry over directly. At 0.5 MPa it pushes 628 N; sizing down, a 32 mm bore yields 402 N, while sizing up, a 50 mm bore yields 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX80S
- ✓ 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 SI40AX80S FAQ
Yes, the AirTAC SI40AX80S is discontinued. The direct replacement is the SAI40AX80S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 80 mm stroke, 628 N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port and M12x1.25 rod thread. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX80S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX80S replacement — usually within 7-8 hours.